ENGINE CONTROL SYSTEM SECTIONEC CONTENTS

Transcription

1 EINE CONTROL SYSTEM SECTIONEC EC CONTENTS PRECAUTIONS AND PREPARATION3 Speial Servie Tools 3 Preautions 3 Engine Fuel & Emission Control System 4 Preautions for Engine Control Module Trouble Diagnosis of Engine 5 Preautions 5 EINE AND EMISSION CONTROL OVERALL SYSTEM7 Ciruit Diagram 7 System Diagram 8 Engine Control Module Component Parts Loation9 Vauum Hose Drawing 11 EINE AND EMISSION ASIC CONTROLSYSTEM DESCRIPTION 12 System Chart 12 Multiport Fuel Injetion (MFI) System13 Distributor Ignition (DI) System16 Air Conditioning Cut Control 17 Fuel Cut Control (at no load & high engine speed) 17 EVAPORATIVE EMISSION SYSTEM18 Desription 18 Inspetion18 POSITIVE CRANKCASE VENTILATION20 Desription 20 Inspetion21 ASIC SERVICE PROCEDURE 22 Fuel Pressure Release 22 Fuel Pressure Chek 22 Fuel Pressure Regulator Chek 23 Injetor Removal and Installation 23 Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment 24 ON-OARD DIAGNOSTIC SYSTEM DESCRIPTION32 Malfuntion Indiator (MI) 32 CONSULT-II36 Generi San Tool (GST) 43 TROULE DIAGNOSIS General Desription 46 Introdution 46 Work Flow 47 Desription for Work Flow 48 Diagnosti Worksheet 49 Diagnosti Trouble Code (DTC) Chart 50 Fail-Safe Chart52 asi Inspetion53 Fast Idle Cam (FIC) Inspetion and Adjustment 55 Symptom Matrix Chart 56 CONSULT-II Referene Value in Data Monitor Mode 58 Major Sensor Referene Graph in Data Monitor Mode 60 ECM Terminals and Referene Value62 TROULE DIAGNOSIS FOR POWER SUPPLY 69 Main Power Supply and Ground Ciruit 69 TROULE DIAGNOSIS FOR DTC Camshaft Position Sensor (CMPS) 73 TROULE DIAGNOSIS FOR DTC Mass Air Flow Sensor (MAFS) 77 TROULE DIAGNOSIS FOR DTC Engine Coolant Temperature Sensor (ECTS) 81

2 TROULE DIAGNOSIS FOR DTC Ignition Signal 85 TROULE DIAGNOSIS FOR DTC Throttle Position Sensor 90 TROULE DIAGNOSIS FOR NON-DETECTALE ITEMS95 Vehile Speed Sensor (VSS) 95 Start Signal 98 EGR Valve and EVAP Canister Purge Control Solenoid Valve 100 Heated Oxygen Sensor (HO2S) 105 Injetor 110 Fuel Pump113 Idle Air Control Valve (IACV) Auxiliary Air Control (AAC) Valve 117 IACV-FICD Solenoid Valve121 Cooling Fan Control124 Power Steering Oil Pressure Swith 129 Neutral Position Swith132 Eletrial Load Signal 135 MI & Data Link Connetors 141 SERVICE DATA AND SPECIFICATIONS (SDS) 142 General Speifiations 142 Inspetion and Adjustment 142 When you read wiring diagrams: Read GI setion, HOW TO READ WIRI DIAGRAMS See EL setion, POWER SUPPLY ROUTI for power distribution iruit See EL setion for NATS information and wiring diagram When you perform trouble diagnoses, read GI setion, HOW TO FOLLOW FLOW CHART IN TROULE DIAGNOSES and HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT For larifiation of system omponent abbreviations and terminology read GI setion SAE J1930 TERMINOLOGY LIST EC-GA-2

3 PRECAUTIONS AND PREPARATION Speial Servie Tools Tool number Tool name EG Ignition oil adapter harness Desription Measuring engine speed X: Appliable : Not appliable X KV Heated oxygen sensor wrenh NT338 Loosening or tightening heated oxygen sensor X NT630 Preautions SUPPLEMENTAL RESTRAINT SYSTEM (SRS) AIR AG and SEAT ELT PRE-TENSIONER The Supplemental Restraint System Air ag and Seat elt Pre-tensioner, used along with a seat belt, help to redue the risk or severity of injury to the driver and front passenger in a frontal ollision The Supplemental Restraint System onsists of an air bag module (loated in the enter of the steering wheel and on the instrument panel on the passenger s side, where fitted), seat belt pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral able In addition to the supplemental air bag modules for a frontal ollision, the supplemental side air bag used along with the seat belt help to redue the risk or severity of injury to the driver and front passenger in a side ollision The supplemental side air bag onsists of air bag modules (loated in the outer side of front seats), satellite sensor, diagnosis sensor unit (one of omponents of supplemental air bags for a frontal ollision), wiring harness, warning lamp (one of omponents of supplemental air bags for a frontal ollision) Information neessary to servie the system safely is inluded in the RS setion of this Servie Manual WARNI: To avoid rendering the SRS inoperative (whih ould inrease the risk of personal injury or death in the event of a ollision whih would result in air bag inflation), all maintenane must be performed by an authorized NISSAN dealer Improper maintenane, inluding inorret removal and installation of the SRS, an lead to personal injury aused by unintentional ativation of the system Do not use eletrial test equipment on any iruit related to the SRS unless instruted in this Servie Manual SRS wiring harnesses (exept SEAT ELT PRE-TENSIONER onnetor) an be identified with yellow harness onnetor (and with yellow harness protetor or yellow insulation tape before the harness onnetors) Do not use eletrial test equipment on any iruit related to the SRS EC-GA-3

4 PRECAUTIONS AND PREPARATION Engine Fuel & Emission Control System ATTERY Always use a 12 volt battery as power soure Do not attempt to disonnet battery ables while engine is running ECM Do not disassemble ECM (Engine ontrol module) Do not turn diagnosis mode seletor foribly If a battery terminal is disonneted, the memory will return to the ECM value The ECM will now start to self-ontrol at its initial value Engine operation an vary slightly when the terminal is disonneted However, this is not an indiation of a problem Do not replae parts beause of a slight variation WIRELESS EQUIPMENT When installing C ham radio or a mobile phone, be sure to observe the following as it may adversely affet eletroni ontrol systems depending on its installation loation 1) Keep the antenna as far away as possible from the ECM 2) Keep the antenna feeder line more than 20 m (79 in) away from the harness of eletroni ontrols Do not let them run parallel for a long distane 3) Adjust the antenna and feeder line so that the standing-wave ratio an be kept small 4) e sure to ground the radio to vehile body EINE CONTROL MODULE PARTS HANDLI Handle mass air flow sensor arefully to avoid damage Do not disassemble mass air flow sensor Do not lean mass air flow sensor with any type of detergent Do not disassemble IACV-AAC valve Even a slight leak in the air intake system an ause serious problems Do not shok or jar the amshaft position sensor WHEN STARTI Do not depress aelerator pedal when starting Immediately after starting, do not rev up engine unneessarily Do not rev up engine just prior to shutdown FUEL PUMP Do not operate fuel pump when there is no fuel in lines Tighten fuel hose lamps to the speified torque (Refer to EM setion) EC-GA-4 EINE CONTROL MODULE HARNESS HANDLI Corret engine ontrol module harness onnetors seurely A poor onnetion an ause an extremely high (surge) voltage to develop in oil and ondenser, resulting in damage to ICs Keep engine ontrol module harness at least 10 m (39 in) away from adjaent harnesses, to prevent an engine ontrol module system malfuntion due to reeiving external noise, degraded operation of ICs, et Keep engine ontrol module parts and harnesses dry efore removing parts, turn off ignition swith and then disonnet battery ground able NEF561

5 PRECAUTIONS AND PREPARATION Preautions for Engine Control Module Trouble Diagnosis of Engine CAUTION: e sure to turn the ignition swith OFF and disonnet the negative battery terminal before any repair or inspetion work The open/short iruit of related swithes, sensors, solenoid valves, et will ause malfuntion e sure to onnet and lok the onnetors seurely after work A loose (unloked) onnetor will ause malfuntion due to the open iruit (e sure the onnetor is free from water, grease, dirt, bent terminals, et) e sure to route and lamp the harnesses properly after work The interferene of the harness with a braket, et may ause malfuntion due to the short iruit e sure to onnet rubber tubes properly after work A misonneted or disonneted rubber tube may ause malfuntion e sure to erase the unneessary malfuntion information (repairs ompleted) in the ECM before returning the vehile to the ustomer Preautions efore onneting or disonneting the ECM harness onnetor, turn ignition swith OFF and disonnet negative battery terminal Failure to do so may damage the ECM beause battery voltage is applied to ECM even if ignition swith is turned off SEF289H Red projetion When onneting ECM harness onnetor, tighten seuring bolt until red projetion is in line with onnetor fae : N m (03-05 kg-m, in-lb) Protetor SEF725H When onneting or disonneting pin onnetors into or from ECM, take are not to damage pin terminals (bend or break) Make sure that there are not any bends or breaks on ECM pin terminal, when onneting pin onnetors end reak SEF291H EC-GA-5

6 Perform ECM input/output signal inspetion before replaement PRECAUTIONS AND PREPARATION Preautions (Cont d) efore replaing ECM, perform Terminals and Referene Value inspetion and make sure ECM funtions properly Refer to EC-GA-62 MEF040D After performing eah TROULE DIAGNOSIS, perform OVERALL FUNCTION CHECK or DTC (Diagnosti Trouble Code) CONFIRMATION PROCEDURE The DTC should not be displayed in the DTC CONFIR- MATION PROCEDURE if the repair is ompleted suessfully The OVERALL FUNCTION CHECK should be a good result if the repair is ompleted suessfully SAT652J attery voltage When measuring ECM signals with a iruit tester, never allow the two tester probes to ontat Aidental ontat of probes will ause a short iruit and may damage the ECM power transistor Short Harness onnetor for solenoid valve ECM Solenoid valve Ciruit tester SEF348N EC-GA-6

7 EINE AND EMISSION CONTROL OVERALL SYSTEM Ciruit Diagram MALFUNCTION INDICATOR LAMP FUSE A C A C A C FAN SWITCH XH HD AC AC AC OA DATA LINK CONNECTOR IGNITION SWITCH ON or START SPEED- OMETER FUEL PUMP RELAY AIR CONDITIONER RELAY VEHICLE SPEED SENSOR FUEL PUMP IGNITION SWITCH ON ATTERY (via fusible link) LIGHTI SWITCH OFF 1ST 2ND To headlamp LH To ompressor To lighting swith or fuse To Lighting swith EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE IACV-AAC VALVE IACV-FICD SOLENOID VALVE COOLI FAN RELAY-1 COOLI FAN MOTOR-2 COOLI FAN MOTOR-1 DUAL-PRESSURE SWITCH THERMO CONTROL AMPLIFIER THERMISTOR NEUTRAL POSITION SWITCH NATS IMMU ECM IGNITION SWITCH FUSILE LINK OFF ACC ON ST FUSE FUSE To rear window defogger swith To rear window defogger relay HEADLAMP RELAY LH TIME CONTROL UNIT AIR CONDITIONER CONTROL PANEL INJECTOR NO 1 NO2 ATTERY ECCS RELAY NO3 NO4 To tahometer RESISTOR POWER TRANSISTOR DISTRIUTOR IGNITION COIL CONDENSER CAMSHAFT POSITION SENSOR MASS AIR FLOW SENSOR SPARK PLUG HEATED OXYGEN SENSOR THROTTLE POSITION SENSOR EINE COOLANT TEMPERATURE SENSOR POWER STEERI OIL PRESSURE : With A/T SWITCH : Without A/C : With XENON headlamp or daytime light system AC OA HD XH : Exept HD YEC287 EC-GA-7

8 EINE AND EMISSION CONTROL OVERALL SYSTEM System Diagram Fuel tank EGR valve & EVAP anister purge ontrol solenoid valve Throttle body PT valve EGR valve Throttle position sensor Fuel strainer Fuel pump EVAP anister Muffler attery Mass air flow sensor Air leaner Fast idle am IACV-FICD solenoid valve IACV-AAC valve Fuel pressure regulator Injetor PCV valve Engine oolant temperature sensor Eletrial load signal Neutral position swith Spark plug Heated oxygen sensor Air onditioner swith Ignition swith ECM (Engine ontrol module) Malfuntion indiator Vehile speed sensor Cooling fan Ignition oil, power transistor, amshaft position sensor built into distributor Three way atalyst EC-GA-8

9 EINE AND EMISSION CONTROL OVERALL SYSTEM Engine Control Module Component Parts Loation Fast idle am Mass air flow sensor EGR valve & EVAP anister purge ontrol solenoid valve Power steering oil pressure swith Throttle position sensor EVAP anister EGRC-PT valve EGR valve Fuel filter Engine oolant temperature sensor IACV-FICD solenoid valve IACV-AAC valve Fuel pressure regulator Distributor with built-in amshaft position sensor, power transistor and ignition oil EGR valve & EVAP anister purge ontrol solenoid valve Heated oxygen sensor Mass air flow sensor IACV-FICD solenoid valve Injetor Throttle position sensor IACV-AAC valve Engine oolant temperature sensor EC-GA-9 NEF365

10 EINE AND EMISSION CONTROL OVERALL SYSTEM Engine Control Module Component Parts Loation (Cont d) ehind the enter onsole ECM harness onnetor Fuel pump SEF452Q EC-GA-10

11 EINE AND EMISSION CONTROL OVERALL SYSTEM Vauum Hose Drawing Fuel pressure regulator EGR valve 3-way onnetor To air leaner Throttle body To EVAP anister EGRC-PT valve EGR valve & EVAP anister purge ontrol solenoid valve NEF366 V 1 V 2 V 3 Fuel pressure regulator to intake manifold EGR valve to 3-way onnetor 3-way onnetor to 3-way onnetor V 4 V 5 V 6 EGRC-PT valve to 3-way onnetor 3-way onnetor to EVAP anister EGR valve & EVAP anister purge ontrol solenoid valve to 3-way onnetor V 7 V 8 EGR valve & EVAP anister purge ontrol solenoid valve to air leaner EGR valve & EVAP anister purge ontrol solenoid valve to throttle body EC-GA-11

12 EINE AND EMISSION ASIC CONTROL SYSTEM DESCRIPTION System Chart Camshaft position sensor Fuel injetion & mixture ratio ontrol Injetors Mass air flow sensor Engine oolant temperature sensor Distributor ignition system Power transistor Ignition swith Idle air ontrol system IACV-AAC valve and IACV- FICD solenoid valve Throttle position sensor Neutral position swith Fuel pump ontrol Fuel pump relay ECM Air onditioner swith attery voltage Heated oxygen sensor monitor & On-board diagnosti system Malfuntion indiator (On the instrument panel) Power steering oil pressure swith Cooling fan ontrol Cooling fan relay Vehile speed sensor Heated oxygen sensor Air onditioner ut ontrol during aeleration Air onditioner relays Eletrial load Rear window defogger swith Lighting swith lower fan swith EGR & EVAP anister purge ontrol EGR valve & EVAP anister purge ontrol solenoid valve EC-GA-12

13 EINE AND EMISSION ASIC CONTROL SYSTEM DESCRIPTION INPUT/OUTPUT SIGNAL LINE Camshaft position sensor Multiport Fuel Injetion (MFI) System Engine speed and piston position Mass air flow sensor Amount of intake air Engine oolant temperature sensor Engine oolant temperature Heated oxygen sensor Density of oxygen in exhaust gas Throttle position sensor Neutral position swith Throttle position Throttle valve idle position Gear position ECM Injetor Vehile speed sensor Vehile speed Ignition swith Start signal Air onditioner swith Air onditioner operation Power steering oil pressure swith Power steering load signal attery attery voltage ASIC MULTIPORT FUEL INJECTION SYSTEM The amount of fuel injeted from the fuel injetor is determined by the ECM The ECM ontrols the length of time the valve remains open (injetion pulse duration) The amount of fuel injeted is a program value in the ECM memory The program value is preset by engine operating onditions These onditions are determined by input signals (for engine speed and intake air) from both the amshaft position sensor and the mass air flow sensor VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION In addition, the amount of fuel injeted is ompensated to improve engine performane under various operating onditions as listed below Fuel inrease During warm-up When starting the engine During aeleration Hot-engine operation High-load, high-speed operation Fuel derease During deeleration EC-GA-13

14 CLOSED LOOP CONTROL Feedbak signal Heated oxygen sensor Combustion ECM (Engine ontrol module) Engine EINE AND EMISSION ASIC CONTROL SYSTEM DESCRIPTION Multiport Fuel Injetion (MFI) System (Cont d) Injetion pulse Injetor Fuel injetion MEF025DD MIXTURE RATIO FEEDACK CONTROL (CLOSED LOOP CONTROL) The mixture ratio feedbak system provides the best air-fuel mixture ratio for driveability and emission ontrol The three way atalyst an then minimize CO, HC and NOx emissions This system uses a heated oxygen sensor in the exhaust manifold to monitor if the engine operation is rih or lean The ECM adjusts the injetion pulse width aording to the sensor voltage signal This maintains the mixture ratio within the stoihiometri range (ideal air-fuel mixture) This stage is referred to as the losed loop ontrol ondition OPEN LOOP CONTROL The open loop system ondition refers to when the ECM detets any of the following onditions Feedbak ontrol stops in order to maintain stabilized fuel ombustion Deeleration and aeleration High-load, high-speed operation Engine idling Malfuntion of heated oxygen sensor or its iruit Insuffiient ativation of heated oxygen sensor at low engine oolant temperature High-engine oolant temperature During warm-up When starting the engine MIXTURE RATIO SELF-LEARNI CONTROL The mixture ratio feedbak ontrol system monitors the mixture ratio signal transmitted from the heated oxygen sensor This feedbak signal is then sent to the ECM The ECM ontrols the basi mixture ratio as lose to the theoretial mixture ratio as possible However, the basi mixture ratio is not neessarily ontrolled as originally designed oth manufaturing differenes (ie, mass air flow sensor hot film) and harateristi hanges during operation (ie, injetor logging) diretly affet mixture ratio Aordingly, the differene between the basi and theoretial mixture ratios is monitored in this system This is then omputed in terms of injetion pulse duration to automatially ompensate for the differene between the two ratios EC-GA-14

15 No 1 ylinder No 2 ylinder No 3 ylinder No 4 ylinder 1 engine yle Sequential multiport fuel injetion system No 1 ylinder No 2 ylinder No 3 ylinder No 4 ylinder 1 engine yle Injetion pulse Simultaneous multiport fuel injetion system EINE AND EMISSION ASIC CONTROL SYSTEM DESCRIPTION Multiport Fuel Injetion (MFI) System (Cont d) MEF522D MEF523D FUEL INJECTION TIMI Two types of systems are used Sequential multiport fuel injetion system Fuel is injeted into eah ylinder during eah engine yle aording to the firing order This system is used when the engine is running Simultaneous multiport fuel injetion system Fuel is injeted simultaneously into all four ylinders twie eah engine yle In other words, pulse signals of the same width are simultaneously transmitted from the ECM The four injetors will then reeive the signals twie for eah engine yle This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating FUEL SHUT-OFF Fuel to eah ylinder is ut off during deeleration or operation of the engine and the vehile at exessively high speeds EC-GA-15

16 EINE AND EMISSION ASIC CONTROL SYSTEM DESCRIPTION Distributor Ignition (DI) System INPUT/OUTPUT SIGNAL LINE Camshaft position sensor Engine speed and piston position Mass air flow sensor Amount of intake air Engine oolant temperature sensor Engine oolant temperature Throttle position sensor Vehile speed sensor Throttle position Throttle valve idle position Vehile speed ECM Power transistor Ignition swith Start signal Neutral position swith Gear position attery attery voltage Tp (mse) Injetion pulse width Engine speed (rpm) SEF742M SYSTEM DESCRIPTION The ignition timing is ontrolled by the ECM to maintain the best air-fuel ratio for every operating ondition of the engine The ignition timing data is stored in the ECM This data forms the map shown The ECM reeives information suh as the injetion pulse width and amshaft position sensor signal Computing this information, ignition signals are transmitted to the power transistor eg, N: 1,800 rpm, Tp: 150 mse A TDC During the following onditions, the ignition timing is revised by the ECM aording to the other data stored in the ECM At starting During warm-up At idle Hot engine operation During aeleration EC-GA-16

17 EINE AND EMISSION ASIC CONTROL SYSTEM DESCRIPTION INPUT/OUTPUT SIGNAL LINE Air Conditioning Cut Control Air onditioner swith Air onditioner ON signal Neutral position swith Neutral position Throttle position sensor Throttle valve opening angle Camshaft position sensor Engine oolant temperature sensor Engine speed Engine oolant temperature ECM Air onditioner relay Ignition swith Start signal Vehile speed sensor Vehile speed Power steering oil pressure swith Power steering load signal SYSTEM DESCRIPTION This system improves aeleration when the air onditioner is used When the aelerator pedal is fully depressed, the air onditioner is turned off for a few seonds INPUT/OUTPUT SIGNAL LINE Fuel Cut Control (at no load & high engine speed) Vehile speed sensor Vehile speed Neutral position swith Neutral position Throttle position sensor Throttle position ECM Injetors Engine oolant temperature sensor Engine oolant temperature Camshaft position sensor Engine speed If the engine speed is above 3,950 rpm with no load (for example, in neutral and engine speed over 3,950 rpm) fuel will be ut off after some time The exat time when the fuel is ut off varies based on engine speed Fuel ut will operate until the engine speed reahes 1,500 rpm, then fuel ut is anelled NOTE: This funtion is different than deeleration ontrol listed under Multiport Fuel Injetion (MFI) System on EC-GA-13 EC-GA-17

18 EVAPORATIVE EMISSION SYSTEM Desription To air leaner EGR valve & EVAP anister purge ontrol solenoid valve Throttle valve Fuel hek valve Vapor vent line Main purge orifie EVAP anister purge ontrol valve Intake manifold Fuel filler ap with vauum relief valve Constant purge orifie EVAP anister Air Fuel vapor MEF609D The evaporative emission system is used to redue hydroarbons emitted into the atmosphere from the fuel system This redution of hydroarbons is aomplished by ativated haroals in the EVAP anister The fuel vapor from the sealed fuel tank is routed into the EVAP anister when the engine is off The fuel vapor is then stored in the EVAP anister The EVAP anister retains the fuel vapor until the EVAP anister is purged by air When the engine is running, the air is drawn through the bottom of the EVAP anister The fuel vapor will then be fed into the intake manifold When the engine runs at idle, the EVAP anister purge ontrol valve is losed Only a small amount of vapor flows into the intake manifold through the onstant purge orifie As the engine speed inreases and the throttle vauum rises, the EVAP anister purge ontrol valve opens The vapor is suked through both main purge and onstant purge orifies SEF312N Inspetion EVAP CANISTER Chek EVAP anister as follows: 1 low air in port VA and ensure that there is no leakage 2 Apply vauum to port VA [Approximately 133 to 200 kpa ( 133 to 200 mbar, 100 to 150 mmhg, 394 to 591 inhg)] 3 Cover port VD with hand 4 low air in port V C and ensure free flow out of port V EC-GA-18

19 Fuel tank side Air Fuel vapor EVAP anister side MEC744 Valve Valve A Fuel tank side SEF427N EVAPORATIVE EMISSION SYSTEM Inspetion (Cont d) FUEL CHECK VALVE Chek valve operation 1 low air through onnetor on fuel tank side A onsiderable resistane should be felt and a portion of air flow should be direted toward the EVAP anister side 2 low air through onnetor on EVAP anister side Air flow should be smoothly direted toward fuel tank side 3 If fuel hek valve is suspeted of not funtioning properly in steps 1 and 2 above, replae it FUEL TANK VACUUM RELIEF VALVE 1 Wipe lean valve housing 2 Suk air through the ap A slight resistane aompanied by valve liks indiates that valve A is in good mehanial ondition Note also that, by further suking air, the resistane should disappear with valve liks 3 low air on fuel tank side and ensure that ontinuity of air passage exists through valve 4 If valve is logged or if no resistane is felt, replae ap as an assembly EC-GA-19

20 POSITIVE CRANKCASE VENTILATION This system returns blow-by gas to the intake manifold olletor The positive rankase ventilation (PCV) valve is provided to ondut rankase blow-by gas to the intake manifold During partial throttle operation of the engine, the intake manifold suks the blow-by gas through the PCV valve Normally, the apaity of the valve is suffiient to handle any blow-by and a small amount of ventilating air The ventilating air is then drawn from the air dut Desription into the rankase In this proess the air passes through the hose onneting air inlet tubes to roker over Under full-throttle ondition, the manifold vauum is insuffiient to draw the blow-by flow through the valve The flow goes through the hose onnetion in the reverse diretion On vehiles with an exessively high blow-by, the valve does not meet the requirement This is beause some of the flow will go through the hose onnetion to the intake manifold olletor under all onditions Cruising PCV valve Aeleration or high load PCV valve PCV valve operation Engine not running or bakfiring Cruising Filter Filter Idling or deelerating Aeleration or high load Fresh Air low-by gas SEF780S EC-GA-20

21 POSITIVE CRANKCASE VENTILATION Inspetion PCV (Positive Crankase Ventilation) VALVE With engine running at idle, remove PCV valve from roker over A properly working valve makes a hissing noise as air passes through it A strong vauum should be felt immediately when a finger is plaed over the valve inlet AEC904 PCV HOSE 1 Chek hoses and hose onnetions for leaks 2 Disonnet all hoses and lean with ompressed air If any hose annot be freed of obstrutions, replae ET277 EC-GA-21

22 ASIC SERVICE PROCEDURE PEF823K Fuel Pressure Release efore disonneting fuel line, release fuel pressure from fuel line to eliminate danger 1 Turn ignition swith to the ON position 2 Perform FUEL PRESSURE RELEASE in WORK SUPPORT mode with CONSULT-II 3 Start engine 4 After engine stalls, rank it two or three times to release all fuel pressure 5 Turn ignition swith to the LOCK position -OR - 1 Remove fuse for fuel pump 2 Start engine 3 After engine stalls, rank it two or three times to release all fuel pressure 4 Turn ignition swith off and reonnet fuel pump fuse Fuel pump fuse Fuel filter Pressure gauge YEC323 NEF367 Fuel Pressure Chek When reonneting fuel line, always use new lamps Make sure that lamp srew does not ontat adjaent parts Use a torque driver to tighten lamps Use Pressure Gauge to hek fuel pressure Do not perform fuel pressure hek with system operating Fuel pressure gauge may indiate false readings 1 Release fuel pressure to zero 2 Disonnet fuel hose between fuel filter and fuel tube (engine side) 3 Install pressure gauge between fuel filter and fuel tube 4 Start engine and hek for fuel leakage 5 Read the indiation of fuel pressure gauge At idling: With vauum hose onneted Approximately 245 kpa (245 bar, 25 kg/m 2, 36 psi) With vauum hose disonneted Approximately 294 kpa (294 bar, 30 kg/m 2, 43 psi) If results are unsatisfatory, perform Fuel Pressure Regulator Chek EC-GA-22

23 ASIC SERVICE PROCEDURE Vauum Engine front To pressure regulator Fuel pressure SEF718 Fuel Pressure Regulator Chek 1 Stop engine and disonnet fuel pressure regulator vauum hose from intake manifold 2 Plug intake manifold with a rubber ap 3 Connet variable vauum soure to fuel pressure regulator 4 Start engine and read indiation of fuel pressure gauge as vauum is hanged Fuel pressure should derease as vauum inreases If results are unsatisfatory, replae fuel pressure regulator Injetor Removal and Installation 1 Release fuel pressure to zero 2 Remove injetor tube assembly with injetors from intake manifold 3 Remove injetors from injetor tube assembly Push injetor tail piee Do not pull on the onnetor Loosen in numerial order Engine front Engine front Upper insulator Lower insulator N m ( kg-m, in-lb) Injetor O-ring AEC792 Insulator NEF547 4 Install injetors Clean exterior of injetor tail piee Use new O-rings Fae metal plate of upper insulator to injetor CAUTION: After properly onneting injetors to fuel tube assembly, hek onnetions for fuel leakage 5 Assemble injetors to injetor tube assembly 6 Install injetor tube assembly to intake manifold 7 Tighten fuel tube bolts to N m ( kg-m, in-lb) as shown in the figure Then tighten the bolts to N m ( kg-m, ft-lb) Tighten in numerial order AEC793 EC-GA-23

24 ASIC SERVICE PROCEDURE PREPARATION Make sure that the following parts are in good order (1) attery (2) Ignition system (3) Engine oil and oolant levels (4) Fuses (5) ECM harness onnetor (6) Vauum hoses (7) Air intake system (Oil filler ap, oil level gauge, et) (8) Fuel pressure (9) Engine ompression (10) Throttle valve (11) EGR valve operation (12) Evaporative emission system Overall inspetion sequene INSPECTION Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment On models equipped with air onditioner, heks should be arried out while the air onditioner is OFF On models equipped with automati transaxle, when heking idle speed, ignition timing and mixture ratio, heks should be arried out while shift lever is in N position When measuring CO perentage, insert probe more than 40 m (157 in) into tail pipe Turn off headlamps, heater blower, rear window defogger Keep front wheels pointed straight ahead Make the hek after the ooling fan has stopped Perform diagnosti test mode II (Self-diagnosti results) Repair or replae Chek & adjust ignition timing b Chek & adjust idle speed b Chek heated oxygen sensor funtion Chek heated oxygen sensor harness Repair or replae harness Chek CO% Replae heated oxygen sensor b Chek emission ontrol parts and repair or replae if neessary Chek heated oxygen sensor funtion INSPECTION END EC-GA-24

25 START ASIC SERVICE PROCEDURE Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont d) SEF935W Visually hek the following: Air leaner logging Hoses and duts for leaks Eletrial onnetors Gasket Throttle valve and throttle position sensor operation Start engine and warm it up until engine oolant temperature indiator points to the middle of gauge Ensure engine stays below 1,000 rpm 1000 r/min SEF247F Open engine hood and run engine at about 2,000 rpm for about 2 minutes under no-load Perform ECM on-board diagnosti system (Diagnosti test mode II) Repair or replae omponents as neessary SAT652J Run engine at about 2,000 rpm for about 2 minutes under no-load Rae engine two or three times under no-load, then run engine for about 1 minute at idle speed 1000 r/min V A SEF248F EC-GA-25

26 V A ASIC SERVICE PROCEDURE Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont d) Throttle position sensor 1) Turn off engine and disonnet throttle position sensor harness onnetor 2) Start engine Timing indiator NEF368 Rae engine (2,000-3,000 rpm) 2 or 3 times under no-load and then run engine at idle speed Chek ignition timing with a timing light Ignition timing: 10 ±2 TDC - Throttle position sensor SEF695L Adjust ignition timing to the speified value by turning distributor after loosening bolts whih seure distributor Ignition timing: 10 ±2 TDC - NEF368 V 1) Turn off engine and disonnet throttle position sensor harness onnetor 2) Start engine V E V C V EC-GA-26

27 ASIC SERVICE PROCEDURE Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont d) V V C Inrease Idle speed adjusting srew Derease IACV-AAC valve NEF369 Chek base idle speed 625±50 rpm Rae engine (2,000-3,000 rpm) 2 or 3 times under noload and run engine at idle speed Adjust idle speed by turning idle speed adjusting srew ase idle speed: 625±50 rpm - 1) Turn off engine and onnet throttle position sensor harness onnetor 2) Start engine Start engine Rae engine (2,000-3,000 rpm) 2 or 3 times under noload and run engine at idle speed V D EC-GA-27

28 V D ASIC SERVICE PROCEDURE Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont d) Chek idle speed Models with daytime light system: 800±50 rpm Models without daytime light system: 700±50 rpm PEF054P Chek IACV-AAC valve and replae if neessary IGN Chek IACV-AAC valve harness and repair if neessary Data link onnetor for CONSULT- II (Connet CHK and IGN terminals with a suitable harness) CHK YEC324 SAT652J Chek ECM funtion* by substituting another known good ECM 1 See M/R F/C MNT in Data monitor mode 2 Run engine at about 2,000 rpm for about 2 minutes under no-load 3 Maintaining engine at 2,000 rpm under noload (engine is warmed up suffiiently), hek that the monitor flutuates between LEAN and RICH more than 5 times during 10 seonds 1 time : RICH LEAN RICH 2 times : RICH LEAN RICH LEAN RICH -OR - * ECM may be the ause of a problem, but this is rarely the ase V F 1 Set Heated oxygen sensor monitor in diagnosti test mode II (See page EC-GA-33) 2 Run engine at about 2,000 rpm for about 2 minutes under no-load 3 Maintaining engine at 2,000 rpm under no-load, hek that the malfuntion indiator on the instrument panel goes ON and OFF more than 5 times during 10 seonds END EC-GA-28

29 ASIC SERVICE PROCEDURE Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont d) Heated oxygen sensor onnetor V F MEF031D SEF194RA Chek heated oxygen sensor harness: 1) Turn off engine and disonnet battery ground able 2) Disonnet ECM harness onnetor from ECM 3) Disonnet heated oxygen sensor harness onnetor Then onnet harness side terminal for heated oxygen sensor to ground with a jumper wire 4) Chek for ontinuity between terminal No 19 of ECM harness onnetor and body ground - Continuity exists Continuity does not exist Repair or replae harness Connet ECM harness onnetor to ECM V E Engine oolant temperature sensor harness onnetor 1 2 SEF214X 1) Connet battery ground able 2) Selet E COOLANT TEMP in ACTIVE TEST mode 3) Set COOLANT TEMP to 20 C (68 F) by touhing Qu and Qd and UP, DWN -OR - 1) Disonnet engine oolant temperature sensor harness onnetor 2) Connet a resistor (25 kω) between terminals of engine oolant temperature sensor harness onnetor 25kΩ resistor SEF750S Start engine and warm it up until engine oolant temperature indiator points to middle of gauge V G SEF935W EC-GA-29

30 V G ASIC SERVICE PROCEDURE Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont d) Rae engine two or three times under no-load, then run engine at idle speed 1000 r/min SEF248F Chek CO % Idle CO: Less than 03% - - After heking CO%, 1) Touh ACK C2QUD01 1) Disonnet the resistor from terminals of engine oolant temperature sensor harness onnetor 2) Connet engine oolant temperature sensor harness onnetor to engine oolant temperature sensor - Replae heated oxygen sensor IGN Data link onnetor for CONSULT- II (Connet CHK and IGN terminals with a suitable harness) C2DMM02 CHK YEC324 1 See M/R F/C MNT in Data monitor mode 2 Maintaining engine at 2,000 rpm under no-load (engine is warmed up suffiiently), hek that the monitor flutuates between LEAN and RICH more than 5 times during 10 seonds 1 time : RICH LEAN RICH 2 times : RICH LEAN RICH LEAN RICH -OR - 1 Set Heated oxygen sensor monitor in diagnosti test mode II (See page EC-GA-33) 2 Maintaining engine at 2,000 rpm under no-load, hek that the malfuntion indiator on the instrument panel goes ON and OFF more than 5 times during 10 seonds ß V H V E EC-GA-30

31 V H ASIC SERVICE PROCEDURE Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont d) Connet heated oxygen sensor harness onnetor to heated oxygen sensor Chek fuel pressure regulator (See page EC-GA-23) Chek mass air flow sensor and its iruit (See page EC-GA-79) Chek injetor and its iruit (See page EC-GA-110) Clean or replae if neessary Chek engine oolant temperature sensor and its iruit (See page EC-GA-81) Chek ECM funtion* by substituting another known good ECM V E *: ECM may be the ause of a problem, but this is rarely the ase EC-GA-31

32 ON-OARD DIAGNOSTIC SYSTEM DESCRIPTION Malfuntion Indiator (MI) 1 The malfuntion indiator will light up when the ignition swith is turned ON without the engine running This is a bulb hek If the malfuntion indiator does not light up, refer to EL setion ( WARNI LAMPS AND CHIME ) or see EC-GA When the engine is started, the malfuntion indiator should go off SAT652J Ignition swith in ON position Condition Engine stopped Engine running Diagnosti Test Mode I UL CHECK MALFUNCTION WARNI Diagnosti Test Mode II SELF-DIAGNOSTIC RESULTS HEATED OXYGEN SENSOR MONITOR EC-GA-32

33 ON-OARD DIAGNOSTIC SYSTEM DESCRIPTION Malfuntion Indiator (MI) (Cont d) Turn ignition swith to ON position (Do not start engine) HOW TO SWITCH DIAGNOSTIC TEST MODES Diagnosti Test Mode I UL CHECK G Start engine Diagnosti Test Mode I MALFUNCTION WARNI Data link onnetor for CONSULT-II (Connet CHK and IGN terminals with a suitable harness) Wait at least 2 seonds Data link onnetor for CONSULT-II (Connet CHK and IGN terminals with a suitable harness) DIAGNOSTIC TEST MODE II SELF-DIAGNOSTIC RESULTS Data link onnetor for CONSULT-II (Connet CHK and IGN terminals with a suitable harness) Wait at least 2 seonds Swithing the diagnosti test mode is not possible when the engine is running When ignition swith is turned off during diagnosis, power to ECM will drop after approx 5 seonds The diagnosis will automatially return to Diagnosti Test Mode I Data link onnetor for CONSULT-II (Connet CHK and IGN terminals with a suitable harness) EC-GA-33

34 DIAGNOSTIC TEST MODE I UL CHECK In this mode, the MALFUNCTION INDICATOR on the instrument panel should stay ON If it remains OFF, hek the bulb Refer to EL setion ( WARNI LAMPS AND CHIME ) or see EC-GA-141 DIAGNOSTIC TEST MODE I MALFUNCTION WARNI MALFUNCTION INDICATOR ON-OARD DIAGNOSTIC SYSTEM DESCRIPTION Malfuntion Indiator (MI) (Cont d) Condition Engine oolant temperature sensor iruit malfuntion or overheating is deteted, or ON the ECM s CPU is malfuntioning OFF No malfuntion These Diagnosti Trouble Code Numbers are larified in Diagnosti Test Mode II (SELF-DIAGNOSTIC RESULTS) DIAGNOSTIC TEST MODE II SELF-DIAGNOSTIC RESULTS In this mode, a diagnosti trouble ode is indiated by the number of flashes of the MALFUNCTION INDI- CATOR as shown below Example: Diagnosti trouble ode No 12 and No ON OFF Diagnosti trouble ode No 12 Diagnosti trouble ode No Unit: seond AEC490 Long (06 seond) flashes indiate the number of ten digits, and short (03 seond) flashes indiate the number of single digits For example, the malfuntion indiator flashes 4 times for about 25 seonds (06 se x 4 times) and then flashes three times for about 1 seond (03 se x 3 times) This indiates the DTC 43 and refers to the malfuntion of the throttle position sensor In this way, all the deteted malfuntions are lassified by their diagnosti trouble ode numbers The DTC 55 refers to no malfuntion (See DIAGNOSTIC TROULE CODE CHART, refer to EC-GA-50) HOW TO ERASE DIAGNOSTIC TEST MODE II (Self-diagnosti results) The diagnosti trouble ode an be erased from the bakup memory in the ECM when the diagnosti test mode is hanged from Diagnosti Test Mode II to Diagnosti Test Mode I (Refer to HOW TO SWITCH DIAGNOSTIC TEST MODES on previous page) If the battery terminal is disonneted, the diagnosti trouble ode will be lost from the bakup memory within 24 hours e areful not to erase the stored memory before starting trouble diagnoses EC-GA-34

35 ON-OARD DIAGNOSTIC SYSTEM DESCRIPTION Malfuntion Indiator (MI) (Cont d) C2SDR02 If the MI flashes or NATS MALFUNCTION is displayed on SELF-DIAG RESULTS sreen, perform self-diagnosti results mode with CONSULT-II using NATS program ard (NATS-E960) Refer to EL setion Confirm no self-diagnosti results of NATS is displayed before touhing ERASE in SELF-DIAG RESULTS mode with CONSULT-II When replaing ECM, initialisation of NATS V20 system and registration of all NATS V20 ignition key IDs must be arried out with CONSULT-II using NATS program ard (NATS-E960) Therefore, be sure to reeive all keys from vehile owner Regarding the proedures of NATS initialisation and NATS ignition key ID registration, refer to CONSULT-II operation manual, NATS V20 DIAGNOSTIC TEST MODE II HEATED OXYGEN SENSOR MONITOR In this mode, the MALFUNCTION INDICATOR displays the ondition of the fuel mixture (lean or rih) whih is monitored by the heated oxygen sensor MALFUNCTION INDICATOR Fuel mixture ondition in the exhaust gas Air fuel ratio feedbak ontrol ondition ON Lean Closed loop system OFF Rih *1 Remains ON or OFF Any ondition Open loop system *1: Maintains onditions just before swithing to open loop To hek the heated oxygen sensor funtion, start engine in Diagnosti Test Mode II Then warm it up until engine oolant temperature indiator points to middle of gauge Next run engine at about 2,000 rpm for about 2 minutes under no-load onditions Make sure that the MAL- FUNCTION INDICATOR omes ON more than 5 times within 10 seonds with engine running at 2,000 rpm under no-load EC-GA-35

36 ON-OARD DIAGNOSTIC SYSTEM DESCRIPTION Data link onnetor for CONSULT-II CONSULT-II CONSULT-II INSPECTION PROCEDURE 1 Turn off ignition swith 2 Connet CONSULT-II to data link onnetor for CON- SULT-II (Data link onnetor for CONSULT-II is loated behind the fuse box over) SAT703J 3 Turn on ignition swith 4 Touh START SAT586J 5 Touh EINE PEF895K 6 Perform eah diagnosti test mode aording to eah servie proedure For further information, see the CONSULT-II Operation Manual PEF216U EC-GA-36

37 EINE CONTROL MODULE COMPONENT PARTS/CONTROL SYSTEMS APPLICATION EINE CONTROL MODULE COMPONENT PARTS INPUT OUTPUT X: Appliable ON-OARD DIAGNOSTIC SYSTEM DESCRIPTION CONSULT-II (Cont d) Item WORK SUPPORT DIAGNOSTIC TEST MODE SELF-DIAG- NOSTIC RESULTS DATA MONITOR ACTIVE TEST Camshaft position sensor X X Mass air flow sensor X X Engine oolant temperature sensor X X X Heated oxygen sensor X Vehile speed sensor X Throttle position sensor Ignition swith (start signal) X Air onditioner swith X Neutral position swith X Power steering oil pressure swith X Eletrial load signal X attery voltage X Injetors X X Power transistor (Ignition timing) X X (Ignition signal) X X IACV-AAC valve X X X Air onditioner relay X Fuel pump relay X X X Cooling fan X X EGR valve & EVAP anister purge ontrol solenoid valve X X FUNCTION Diagnosti test mode Work support Self-diagnosti results Data monitor Ative test ECM part numbers Funtion A tehniian an adjust some devies faster and more aurately by following indiations on CONSULT-II Self-diagnosti results an be read and erased quikly Input/Output data in the ECM an be read CONSULT-II drives some atuators apart from the ECM s and also shifts some parameters in a speified range ECM part numbers an be read EC-GA-37

38 WORK SUPPORT MODE WORK ITEM CONDITION USAGE IGNITION TIMI ADJ IGNITION TIMI FEEDACK CONTROL WILL E HELD Y TOUCHI START AFTER DOI SO, ADJUST IGNITION TIMI WITH A TIMI LIGHT Y TURNI THE CAMSHAFT POSITION SEN- SOR IACV-AAC VALVE ADJ ON-OARD DIAGNOSTIC SYSTEM DESCRIPTION CONSULT-II (Cont d) SET EINE SPEED AT THE SPECIFIED VALUE UNDER THE FOLLOWI CONDITIONS EINE WARMED UP NO-LOAD FUEL PRESSURE RELEASE FUEL PUMP WILL STOP Y TOUCHI START DURI IDLI CRANK A FEW TIMES AFTER EINE STALLS When adjusting initial ignition timing When releasing fuel pressure from fuel line SELF DIAGNOSTIC MODE Freeze Frame Data and 1st Trip Freeze Frame Data Freeze frame data item* DIAG TROULE CODE FUEL SYS-1 CAL/LD VALUE [%] COOLANT TEMP [ C] or [ F] S-FUEL TRIM-1 [%] L-FUEL TRIM-1 [%] EINE SPEED [rpm] VHCL SPEED [km/h] or [mph] ASOL PRESS [kpa], [kg/m 2 ]or [psi] /FUEL SCHDL [mse] INT/A TEMP SE [ C] Desription Engine ontrol omponent part/ontrol system has a trouble ode Fuel injetion system status at the moment a malfuntion is deteted is displayed One mode in the following is displayed MODE 2 : Open loop due to deteted system malfuntion MODE 3 : Open loop due to driving onditions (power enrihment, deeleration enrihment) MODE 4 : Closed loop - using heated oxygen sensor(s) as feedbak for fuel ontrol MODE 5 : Open loop - has not yet satisfied ondition to go to losed loop The alulated load value at the moment a malfuntion is deteted is displayed The engine oolant temperature at the moment a malfuntion is deteted is displayed Short-term fuel trim at the moment a malfuntion is deteted is displayed The short-term fuel trim indiates dynami or instantaneous feedbak ompensation to the base fuel shedule Long-term fuel trim at the moment a malfuntion is deteted is displayed The long-term fuel trim indiates muh more gradual feedbak ompensation to the base fuel shedule than short-term fuel trim The engine speed at the moment a malfuntion is deteted is displayed The vehile speed at the moment a malfuntion is deteted is displayed The absolute pressure at the moment a manlfuntion is deteted is displayed The base fuel shedule at the moment a malfuntion is deteted is displayed The intake air temperature at the moment a malfuntion is deteted is desplayed *: The items are the same as those of 1st trip freeze frame data EC-GA-38

39 SELF-DIAGNOSTIC MODE Regarding items deteted in SELF-DIAG RESULTS mode, refer to Diagnosti Trouble Code (DTC) Chart (Refer to EC-GA-50) DATA MONITOR MODE Monitored item [Unit] CMPSvRPM (REF) [rpm] MAS AIR/FL SE [V] COOLAN TEMP/S [ C] or [ F] O2 SEN [V] M/R F/C MNT [RICH/LEAN] ECM input signals j Main signals j j j j j j j j j VHCL SPEED SE [km/h] or [mph] j j ATTERY VOLT [V] j j START SIGNAL [ON/OFF] j j CLSD THL/POSI [ON/OFF] j j AIR COND SIG [ON/OFF] j j P/N POSI SW [ON/OFF] j j PW/ST SIGNAL [ON/OFF] ON-OARD DIAGNOSTIC SYSTEM DESCRIPTION CONSULT-II (Cont d) Desription Indiates the engine speed omputed from the REF signal (180 signal) of the amshaft position sensor The signal voltage of the mass air flow sensor is displayed The engine oolant temperature (determined by the signal voltage of the engine oolant temperature sensor) is displayed The signal voltage of the heated oxygen sensor is displayed Display of heated oxygen sensor signal during air-fuel ratio feedbak ontrol: RICH means the mixture beame rih, and ontrol is being effeted toward a leaner mixture LEAN means the mixture beame lean, and ontrol is being effeted toward a rih mixture The vehile speed omputed from the vehile speed sensor signal is displayed The power supply voltage of ECM is displayed Indiates [ON/OFF] ondition from the starter signal Indiates the losed throttle position [ON/OFF] determined by the throttle position sensor signal ON: Closed throttle position OFF: Other than losed throttle position Indiates [ON/OFF] ondition of the air onditioner swith as determined by the air onditioning signal Indiates [ON/OFF] ondition from the park/neutral position swith signal j j Indiates [ON/OFF] ondition of the power steering oil pressure swith determined by the power steering oil pressure signal Remarks Auray beomes poor if engine speed drops below the idle rpm If the signal is interrupted while the engine is running, an abnormal value may be indiated When the engine is stopped, a ertain value is indiated When the engine oolant temperature sensor is open or short-iruited, ECM enters fail-safe mode The engine oolant temperature determined by the ECM is displayed After turning ON the ignition swith, RICH is displayed until air-fuel mixture ratio feedbak ontrol begins When the air-fuel ratio feedbak is lamped, the value just before the lamping is displayed ontinuously After starting the engine, [OFF] is displayed regardless of the starter signal NOTE: Any monitored item that does not math the vehile being diagnosed is deleted from the display automatially EC-GA-39

40 ON-OARD DIAGNOSTIC SYSTEM DESCRIPTION CONSULT-II (Cont d) Monitored item [Unit] LOAD SIGNAL [ON/OFF] INJ PULSE [mse] IGN TIMI [TDC] IACV-AAC/V [%] A/F ALPHA [%] ECM input signals j Main signals AIR COND RLY [ON/OFF] j COOLI FAN [ON/OFF] Desription Indiates [ON/OFF] ondition from the rear defogger signal and/or lighting swith j ON: Rear defogger is operating and/or lighting swith is on OFF: Rear defogger is not operating and lighting swith is not on Indiates the atual fuel injetion j pulse width ompensated by ECM aording to the input signals Indiates the ignition timing omputed j by ECM aording to the input signals j Indiates the idle air ontrol valve (AAC valve) ontrol value omputed by ECM aording to the input signals j Indiates the mean value of the airfuel ratio feedbak orretion fator per yle j FUEL PUMP RLY [ON/OFF] j EGRC SOL/V [ON/OFF] VOLTAGE [V] PULSE [mse] or [Hz] or [%] j Indiates the air onditioner relay ontrol ondition (determined by ECM aording to the input signal) Indiates the ontrol ondition of the ooling fans (determined by ECM aording to the input signal) ON Operating OFF Stopped Indiates the fuel pump relay ontrol ondition determined by ECM aording to the input signals Indiates the ontrol ondition of the EGR valve & EVAP anister purge ontrol solenoid valve (determined by ECM aording to the input signal) ON EGR system operation ut-off OFF EGR system operation not ut-off Voltage measured by the voltage probe Pulse width, frequeny or duty yle measured by the pulse probe Remarks When the engine is stopped, a ertain omputed value is indiated When the engine is stopped, a ertain value is indiated This data also inludes the data for the air-fuel ratio learning ontrol Only # is displayed if item is unable to be measured Figures with # s are temporary ones They are the same figures as an atual piee of data whih was just previously measured EC-GA-40

41 ACTIVE TEST MODE TEST ITEM CONDITION JUDGEMENT CHECK ITEM (REMEDY) FUEL INJECTION IACV-AAC/V OPENI E COOLANT TEMP IGNITION TIMI POWER ALANCE COOLI FAN FUEL PUMP RELAY EGRC SOLENOID VALVE SELF-LEARNI CONT ON-OARD DIAGNOSTIC SYSTEM DESCRIPTION CONSULT-II (Cont d) Engine: Return to the original trouble ondition Change the amount of fuel injetion using CONSULT-II Engine: After warming up, idle the engine Change the IACV-AAC valve opening perent using CON- SULT-II Engine: Return to the original trouble ondition Change the engine oolant temperature indiation using CONSULT-II Engine: Return to the original trouble ondition Timing light: Set Retard the ignition timing using CONSULT-II Engine: After warming up, idle the engine A/C swith OFF Shift lever N Cut off eah injetor signal one at a time using CONSULT-II Ignition swith: ON Turn the ooling fan ON and OFF using CONSULT-II Ignition swith: ON (Engine stopped) Turn the fuel pump relay ON and OFF using CONSULT-II and listen to operating sound Ignition swith: ON Turn solenoid valve ON and OFF with the CONSULT-II and listen to operating sound If trouble symptom disappears, see CHECK ITEM Engine speed hanges aording to the opening perent If trouble symptom disappears, see CHECK ITEM If trouble symptom disappears, see CHECK ITEM Engine runs rough or dies Cooling fan moves and stops Fuel pump relay makes the operating sound Solenoid valve makes an operating sound Harness and onnetor Fuel injetors Heated oxygen sensor Harness and onnetor IACV-AAC valve Harness and onnetor Engine oolant temperature sensor Fuel injetors Adjust initial ignition timing Harness and onnetor Compression Injetors Power transistor Spark plugs Ignition oils Harness and onnetor Cooling fan motor Cooling fan relay Harness and onnetor Fuel pump relay Harness and onnetor Solenoid valve In this test, the oeffiient of self-learning ontrol mixture ratio returns to the original oeffiient by touhing CLEAR on the sreen EC-GA-41