ADVANCED ENGINE PERFORMANCE SPECIALIST TEST (L1)

Transcription

1 REVISED 2016 ADVANCED ENGINE PERFORMANCE SPECIALIST TEST (L1) COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET This ooklet is intended only for referene when prepring for nd tking the ASE Advned Engine Performne Speilist Test. The omposite vehile type 4 powertrin ontrol system is sed on designs ommon to mny vehile mnufturers, ut is not identil to ny tul prodution vehile.

2 Tle of Contents INTRODUCTION... 4 POWERTRAIN... 4 ENGINE... 4 TRANSMISSION... 4 CONTROL MODULES... 4 ENGINE CONTROL MODULE (ECM)... 4 FUEL PUMP CONTROL MODULE (FPCM)... 5 TRANSMISSION CONTROL MODULE (TCM)... 5 INSTRUMENT CLUSTER MODULE (ICM)... 5 IMMOBILIZER MODULE... 5 SYSTEMS... 6 ELECTRONIC THROTTLE CONTROL SYSTEM... 6 EXHAUST SYSTEM... 6 FUEL DELIVERY SYSTEM... 6 IGNITION SYSTEM... 7 IMMOBILIZER ANTI-THEFT SYSTEM... 7 ON-BOARD REFUELING VAPOR RECOVERY (ORVR) EVAP SYSTEM... 7 FUEL INJECTION SYSTEM... 8 VARIABLE VALVE LIFT CONTROL SYSTEM... 9 VARIABLE VALVE TIMING SYSTEM... 9 INPUTS - SENSORS ACCELERATOR PEDAL POSITION (APP 1 AND APP 2) SENSORS A/C PRESSURE SENSOR A/C ON/OFF REQUEST SWITCH AIR/FUEL RATIO SENSORS (AFRS 1/1 AND AFRS 2/1) BRAKE PEDAL POSITION (BPP) SWITCH CAMSHAFT POSITION SENSORS (CMP 1 AND CMP 2) CRANKSHAFT POSITION (CKP) SENSOR EGR VALVE POSITION SENSOR FUEL LEVEL SENSOR FUEL PRESSURE (FP) SENSOR FUEL TANK (EVAP) PRESSURE SENSOR KNOCK SENSORS HEATED OXYGEN SENSOR (HO2S 1/2 nd HO2S 2/2) IGNITION SWITCH MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR MASS AIRFLOW (MAF) SENSOR THROTTLE POSITION (TP 1 AND TP 2) SENSORS PAGE 2 ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET

3 TEMPERATURE SENSORS TRANSMISSION RANGE (TR) SWITCH TRANSMISSION TURBINE SHAFT SPEED (TSS) SENSOR VARIABLE VALVE LIFT SYSTEM SENSORS VEHICLE SPEED SENSOR (VSS) OUTPUTS - ACTUATORS CAMSHAFT POSITION ACTUATOR CONTROL SOLENOIDS EVAPORATIVE EMISSION (EVAP) CANISTER PURGE SOLENOID EVAPORATIVE EMISSION (EVAP) CANISTER VENT SOLENOID EXHAUST GAS RECIRCULATION (EGR) VALVE FAN CONTROL (FC) RELAY FUEL INJECTORS GENERATOR IGNITION COILS MALFUNCTION INDICATOR LAMP (MIL) STARTER RELAY THROTTLE ACTUATOR CONTROL (TAC) MOTOR TRANSMISSION SOLENOIDS VARIABLE VALVE LIFT MOTORS OBD SYSTEM OPERATION DATA COMMUNICATION SYSTEM MONITORS MONITOR READINESS STATUS WARM UP CYCLE TRIP DRIVE CYCLE FREEZE FRAME DATA STORING AND CLEARING DTCS & FREEZE FRAME DATA, TURNING MIL ON & OFF SCAN TOOL PIN / COMPONENT CROSS REFFERENCE...27 SCAN TOOL DATA CHART...28 ELECTRICAL DIAGRAM ELECTRICAL DIAGRAM ELECTRICAL DIAGRAM ELECTRICAL DIAGRAM SYSTEM CUTAWAY DRAWING...34 ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET PAGE 3

4 INTRODUCTION This ASE Composite Vehile Type 4 ws oneived nd uilt y tehnil ommittees of industry experts to ommodte high level dignosti questions on the L1 test. While some spets of this Composite Vehile my pper similr to vehiles from numer of mnufturers, it is importnt to understnd this vehile is unique design nd is NOT intended to represent ny speifi mke or model. This referene doument should e used when nswering questions identified s Composite Vehile questions. Note: All testing is performed t se level unless otherwise indited. The referene mterils nd questions for this test use terms nd ronyms tht re onsistent with SAE stndrds J1930 nd J2012. POWERTRAIN ENGINE Generi, four-stroke, V6 design. Equipped with four hin-driven overhed mshfts, 24 vlves, hydruli vlve lifters, vrile intke mshft timing, nd vrile intke vlve lift. TRANSMISSION 6-speed, utomti trnsxle with overdrive. Controlled y trnsmission ontrol module (TCM). 3 plnetry ger sets, 5 luth pks, nd single one-wy luth. 6 forwrd gers nd 1 reverse ger. A torque onverter trnsmits power from the engine to the trnsmission nd is ple of lok-up in 3rd, 4th, 5th, nd 6th gers. Contins n eletroni pressure ontrol (EPC) solenoid, 5 shift solenoids, nd torque onverter luth solenoid. CONTROL MODULES ENGINE CONTROL MODULE (ECM) Clultes ignition nd fuel requirements, ontrols engine tutors nd provides inputs to other modules to provide the desired driveility, fuel eonomy, nd emissions ontrol. Reeives dt input from other ontrol modules nd sensors. Controls the vehile s hrging system. Reeives power from the ttery nd ignition swith nd provides regulted 5-volt supply for most of the engine sensors. Engine ontrol fetures inlude oil-on-plug ignition, mss irflow, sequentil port fuel injetion, vrile vlve timing, vrile vlve lift, eletroni throttle tutor ontrol (TAC), ir/fuel rtio sensors, dt ommunitions us, vehile nti-theft immoilizer system, nturl vuum lek detetion EVAP system nd n on-ord refueling vpor reovery (ORVR) system. The ontrol system softwre nd OBD dignosti proedures stored in the ECM n e updted using ftory supplied lirtion files nd PC-sed interfe softwre, long with sn tool or reprogrmming devie tht onnets the PC to the vehile s dt link onnetor (DLC). Contins 120 Ω terminting resistor for the dt us. PAGE 4 ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET

5 FUEL PUMP CONTROL MODULE (FPCM) Communites with the ECM over Lol Are Network (LAN). ECM provides 5-volt enle signl to the FPCM to enle fuel pump opertion: for two seonds with the ignition swith in the RUN position. when the ignition swith is in the START position. when the engine speed (CKP) signl is ove 100 rpm. FPCM hnges the volume of fuel supplied y the fuel pump y vrying the duty-yle of the voltge supplied to the fuel pump. LOW fuel pump speed ommnd = fuel pump supply voltge duty-yled t 50 %. HIGH fuel pump speed ommnd = fuel pump supply voltge duty-yled t 100 %. HIGH fuel pump speed is ommnded: during key ON/engine OFF prime. with the engine rnking. under high engine lod. during opertion t low hrging system voltge. If there is ommunition fult on the LAN us, nd the 5-volt enle signl is present t the FPCM, the FPCM will defult to HIGH speed fuel pump opertion. Atul fuel pump duty yle is monitored y the FPCM nd is reported y the FPCM to the ECM vi the LAN us. ECM OFF LOW HIGH FPCM Feedk 0 % 50 % 100 % TRANSMISSION CONTROL MODULE (TCM) Provides the orret trnsmission outputs for desired driveility, fuel eonomy, nd emissions ontrol. Reeives dt input from other ontrol modules nd sensors. Provides dt inputs to other ontrol modules inluding vehile speed nd ger seletion. Provides its own regulted 5-volt supply. Performs ll OBD II trnsxle dignosti routines nd stores trnsxle DTCs. The ontrol system softwre nd OBD dignosti proedures stored in the TCM n e updted in the sme wy s the ECM. Filures tht result in pending or onfirmed DTC relted to ny of the following omponents will use the TCM to defult to fil-sfe mode: trnsmission rnge swith, eletroni pressure ontrol (EPC), shift solenoids, turine shft speed sensor, nd the vehile speed sensor. The TCM will lso defult to fil-sfe mode if it is unle to ommunite with the ECM. When in fil-sfe mode, the TCM ommnds mximum line pressure nd turns off ll trnsmission solenoids. The trnsmission then defults to 5th ger nd the torque onverter luth will e disled. INSTRUMENT CLUSTER MODULE (ICM) Reeives dt input from other ontrol modules to disply engine rpm, vehile speed, fuel level, nd oolnt temperture. Inludes Mlfuntion Inditor Lmp (MIL) nd n immoilizer inditor. If the instrument luster fils to ommunite with the ECM nd TCM, the MIL is ontinuously lit. Contins 120 Ω terminting resistor for the dt us. IMMOBILIZER MODULE Communites with the ECM. Provides ignition key informtion. See IMMOBILIZER ANTITHEFT SYSTEM on pge 7. ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET PAGE 5

6 SYSTEMS ELECTRONIC THROTTLE CONTROL SYSTEM The vehile does not hve mehnil throttle le, ruise ontrol throttle tutor, or n idle ir ontrol (IAC) vlve. Throttle opening t ll engine speeds nd lods is ontrolled diretly y throttle tutor ontrol (TAC) motor mounted on the throttle ody housing. Dul elertor pedl position (APP) sensors provide input from the vehile opertor, while the tul throttle ngle is determined using dul throttle position (TP) sensors. If one APP sensor or one TP sensor fils, the ECM will turn on the mlfuntion inditor lmp (MIL) nd limit the mximum throttle opening to 35 %. If oth APP sensors or oth TP sensors fil, or orreltion error ours, the ECM will turn on the MIL nd disle the eletroni throttle ontrol. When disled y the ECM, the eletroni throttle ontrol system will defult to limp-in opertion: the spring-loded throttle plte will return to defult position of 15 % throttle opening. the TAC vlue on the sn tool will indite 15 %. it will hve fst idle speed of 1400 to 1500 rpm, with no lod nd ll essories off. Norml no lod idle rnge is 850 to 900 rpm t 5 % to 10 % throttle opening. No idle relern proedure is required fter omponent replement or loss of voltge to the ECM. EXHAUST SYSTEM A single exhust system tht is onfigured using Y-pipe tht onnets two front tlysts, single downstrem tlyst, nd muffler. BANK 1 CATALYST ENGINE BANK 2 CATALYST DOWNSTREAM HO2 SENSOR UPSTREAM A/F RATIO SENORS DOWNSTREAM CATALYST DOWNSTREAM HO2 SENSOR MUFFLER FUEL DELIVERY SYSTEM Consists of n ECM, fuel pump ontrol module (FPCM), fuel pressure sensor (FPS), nd fuel pump ssemly. Sequentil Multiport Fuel Injetion (SFI). Returnless fuel supply with the eletri fuel pump ssemly mounted inside the fuel tnk. Fuel pressure regultor tthed to the fuel pump ssemly to ontrol fuel pressure. The fuel pump ontrol module (FPCM) supplies duty-yled, feed-side voltge to the fuel pump. The fuel pump ontrol module (FPCM) provides feedk to the ECM vi LAN us. Key ON/engine OFF fuel pressure = 58 to 62 psi (400 to 427 kp). Fuel system pressure should e etween 58 to 62 psi (400 to 427 kp) during ll operting onditions. PAGE 6 ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET

7 IGNITION SYSTEM Distriutorless Ignition (EI) with six ignition oils (oil-on-plug). Firing Order: Cylinders 1, 3, nd 5 re on Bnk 1; Cylinders 2, 4, nd 6 re on Bnk 2. Ignition timing is not djustle. Crnkshft position (CKP) sensor input is used for se timing lultion. ECM ontrols ignition timing. Ignition oil drivers re integrted into the ECM. IMMOBILIZER ANTI-THEFT SYSTEM When the ignition swith is turned on, the immoilizer ontrol module sends hllenge signl through the ntenn round the ignition swith to the trnsponder hip in the ignition key. The trnsponder key responds with n enrypted key ode. The immoilizer ontrol module then deodes the key ode nd ompres it to the list of registered keys. When the engine is strted, the ECM sends request to the immoilizer ontrol module over the dt us to verify the key vlidity. If the key is vlid, the immoilizer ontrol module responds with vlid key messge. The ECM ontinues norml engine opertion. One the engine is strted with vlid key, the immoilizer system nnot use engine shutdown. If n ttempt is mde to strt the vehile with n invlid ignition key, the immoilizer ontrol module sends messge over the dt us to the instrument luster to flsh the nti-theft inditor lmp. Without vlid key messge from the immoilizer ontrol module within 2 seonds of engine strtup, the ECM will disle the fuel injetors to kill the engine. Cyling the key off nd rnking the engine gin will result in engine restrt nd stll. The immoilizer ontrol module nd ECM eh hve their own unique internl ID numers used to enrypt their messges, nd re progrmmed t the ftory to reognize eh other. If either module is repled, the sn tool must e used to progrm the replement module, using the VIN, the dte, nd ftory-ssigned PIN numer. Up to eight keys n e registered in the immoilizer ontrol module. Eh key hs its own unique internl key ode. If only one vlid key is ville, or if ll keys hve een lost, the sn tool n e used to delete lost keys nd register new keys. This proedure lso requires the VIN, the dte, nd ftory-ssigned PIN numer. The immoilizer ontrol module does not require key ID relern if ttery voltge is lost. Neither the ECM, TCM, nor the immoilizer ontrol module prevent opertion of the strter motor for nti-theft purposes. ON-BOARD REFUELING VAPOR RECOVERY (ORVR) EVAP SYSTEM Cuses fuel tnk vpors to e direted to the EVAP hrol nister during refueling, so tht fuel vpors do not espe into the tmosphere. The following omponents hve een dded to the trditionl EVAP system for ORVR pility: one inh I.D. fill pipe, one-wy hek vlve t the ottom of the fill pipe, n ORVR vpor ontrol vlve inside the fuel tnk, nd 1/2 inh I.D. vent hose from the ORVR vpor ontrol vlve to the nister. The ORVR vpor ontrol vlve hs flot tht rises to sel the vent hose when the fuel tnk is full. It lso prevents liquid fuel from rehing the nister nd loks fuel from leking in the event of vehile roll-over. ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET PAGE 7

8 FUEL INJECTION SYSTEM Sequentil port fuel injetion, single injetor for eh ylinder. Fuel injetors re loted in the intke mnifold ports ner the intke vlves. Fuel injetors re ground-side ontrolled. STARTING MODE When the ignition swith is turned to RUN, the ECM sends 5-volt enle signl to the FPCM for two seonds to uild pressure in the fuel system. If n rpm signl is not reeived y the ECM within two seonds, the 5-volt enle signl to the FPCM is turned OFF. After the two seond prime, the ECM will mintin the 5-volt enle signl to the FPCM with the ignition swith in the START position, or s long s the engine speed (CKP) is 100 rpm or more. CLEAR FLOOD MODE During rnking, when the elertor pedl is fully depressed (pedl position of 80 % or greter) nd the engine speed is elow 400 rpm, the ECM turns off the fuel injetors. RUN MODES: OPEN AND CLOSED LOOP, FUEL CUT OFF OPEN LOOP - In open loop, the ECM does not use the ir/fuel rtio sensor signls. Insted, it lultes the fuel injetor pulse width sed on MAF nd engine temperture. The system will sty in open loop until ll of these onditions re met: ten seonds hve elpsed sine strt up. throttle position is less thn 80 %. CLOSED LOOP - When the ECM reeives vlid ir/fuel rtio signls nd the throttle is open less thn 80 %, the system will e in losed loop. FUEL CUT OFF MODE - The ECM will turn off the fuel injetors if ny of the following re met: vehile speed rehes 110 mph. engine speed exeeds 6000 rpm while driving. engine speed exeeds 3000 rpm in PARK/NEUTRAL. vehile is deelerting with engine speed greter thn 1500 rpm, engine temperture is greter thn 120 F (49 C), nd the throttle is losed (APP less thn 10 %). ABSOLUTE LOAD The ECM uses the MAF sensor input nd stored engine displement informtion versus engine speed to lulte the ir hrge moving through the engine ginst theoretil mximum. Vlues of solute lod orrelte with volumetri effiieny t wide open throttle (WOT). Displyed s perentge in sn dt. Norml solute lod t WOT is 95 %. Typil vlues t norml idle re pproximtely 15 %. PAGE 8 ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET

9 VARIABLE VALVE LIFT CONTROL SYSTEM Vrile vlve lift is used for improved engine effiieny, performne nd emissions ontrol. The ECM ontrols vrile vlve lift in reltion to engine rpm. Below 3000 rpm, the VVL system will ommnd motor position to 0 %, se vlve lift. Aove 3000 rpm, the VVL system will ommnd motor position to 100 % resulting in n dditionl 4 mm of vlve lift. Eh nk hs its own 2-wire motor with position sensors for feedk. The VVL position sensors will red 0.50 V t low lift (0 % ommnd) nd 4.50 V t high lift (100 % ommnd). On eh intke mshft, DC motor is tthed to rod whih opertes fulrum tthed to the roker rms, effetively hnging the roker rm rtio. If there re ny fults deteted in the VVL system, the VVL will e ommnded to the low lift position. Anytime the TAC system is in filsfe mode (disled), the VVL will lso e ommnded to the lowest lift position. The VVL system is not used to ontrol idle speed. VARIABLE VALVE TIMING SYSTEM A single timing hin drives the intke nd exhust ms of oth nks of the engine. Intke mshft timing is ontinuously vrile using hydruli tutor tthed to the front end of eh intke mshft. Engine oil flow to eh hydruli tutor is ontrolled y mshft position tutor ontrol solenoid. The exhust mshft timing is fixed. Cmshft timing is determined y the ECM using the rnkshft position (CKP) sensor nd mshft position sensor (CMP 1 nd CMP 2) signls. At idle, the intke mshfts re fully retrded nd vlve overlp is zero degrees. At higher speeds nd lods, the intke mshfts n e dvned up to 40 rnkshft degrees. Eh intke mshft hs seprte mshft position sensor, hydruli tutor, nd ontrol solenoid. If little or no oil pressure is reeived y hydruli tutor (typilly t engine strtup, t idle speed, or during fult ondition), it is designed to mehnilly defult to the fully retrded position (zero vlve overlp), nd is held in tht position y spring-loded loking pin. ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET PAGE 9

10 PAGE 10 INPUTS - SENSORS ACCELERATOR PEDAL POSITION (APP 1 AND APP 2) SENSORS A pir of redundnt non-djustle potentiometers tht sense elertor pedl position. Loted on the elertor pedl ssemly. APP 1 sensor output vries from 0.5 volts (pedl relesed) to 3.5 volts (pedl fully pressed); inresing voltge with inresing pedl position. APP 2 sensor output vries from 1.5 volts (pedl relesed) to 4.5 volts (pedl fully pressed); inresing voltge with inresing pedl position, offset from the APP 1 sensor signl y 1.0 volt. ECM interprets n APP of 80 % or greter s request for wide open throttle. A iruit filure of one APP sensor will set DTC nd the ECM will limit the mximum throttle opening to 35 %. A iruit filure of oth APP sensors, or orreltion error, will set DTC nd disle the TAC. When disled, the spring-loded throttle plte will return to the defult 15 % position (fst idle). Aelertor Pedl Position (% pplied) A/C PRESSURE SENSOR Three-wire solid-stte sensor for A/C system high-side pressure. Sensor output vries from 0.25 volts t 25 psi to 4.50 volts t 450 psi. Used s input for A/C ompressor luth ontrol, rditor fn ontrol, nd idle speed ompenstion. ECM will disle A/C ompressor opertion if the pressure is elow 40 psi or ove 420 psi. Loted on the A/C high-side vpor line. A/C Pressure Sensor A/C High Side Pressure (psi) APP 1 Sensor Voltge APP 2 Sensor Voltge Sensor Voltge Aelertor Pedl Position (% of pedl pplition) A/C High Side Pressure (psi) 0 Aelertor Pedl Position Sensors APP 1 APP Sensor Voltge APP A/C Pressure Sensor Voltge ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET

11 A/C ON/OFF REQUEST SWITCH Normlly open (N.O.) swith tht loses when A/C ompressor opertion is requested. Sttus is used y ECM. Loted in the limte ontrol unit on the instrument pnel. AIR/FUEL RATIO SENSORS (AFRS 1/1 AND AFRS 2/1) Plnr-type AFR sensor used y the ECM to mesure the ir/fuel rtio of the exhust strem. AFRS 1/1 loted on the Bnk 1 exhust mnifold (ylinders 1, 3, nd 5). AFRS 2/1 loted on the Bnk 2 exhust mnifold (ylinders 2, 4, nd 6). Perfetly lned ir/fuel mixture t 14.7:1 (Lmd 1) = 2.5 volts displyed on the sn tool. Len ir/fuel mixture t 20:1 (Lmd 1.36) = 4.3 volts displyed on the sn tool. Rih ir/fuel mixture t 11:1 (Lmd 0.75) = 1.3 volts displyed on the sn tool. ECM monitors polrity nd quntity of urrent to the sensor to determine ir/fuel rtio in the exhust. Perfetly lned ir/fuel mixture t 14.7:1 (Lmd 1) = no sensor urrent produed. Rih ir/fuel mixture = the sensor produes negtive urrent etween zero nd miromps. Len ir/fuel mixture = the sensor produes positive urrent etween zero nd miromps. Bttery voltge is ontinuously supplied to the ir/fuel rtio sensor heters when ignition swith is ON. The ECM supplies pulse width modulted ground to the heters to ontrol the temperture of the sensor. The duty yle displyed on the sn tool represents the perent of heter urrent on time. The ECM monitors the AFR heter urrent. The norml AFRS heter resistne is 2-6 Ω t 68 F (20 C). Air/Fuel Rtio Lmd Sn Tool Voltge Current (miromps) 20: : : : : : : : : : : Air/Fuel Rtio 20:1 19:1 18:1 17:1 16:1 14.7:1 14:1 13:1 12:1 Air/Fuel Rtio Sensor : Sensor Voltge in Sn Tool Dt Current (miromps) BRAKE PEDAL POSITION (BPP) SWITCH Normlly open (N.O.) swith tht loses when the rke pedl is pressed/pplied. Sttus is used y TCM. Loted on the rke pedl. ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET PAGE 11

12 CAMSHAFT POSITION SENSORS (CMP 1 AND CMP 2) A pir of three-wire solid stte Hll-effet sensors tht generte signl one per intke mshft revolution. Loted t the rer of eh vlve over, the sensors re triggered y n interrupter on the intke mshfts. The leding edge of the nk 1 CMP signl ours on the ylinder 1 ompression stroke, nd the leding edge of the nk 2 CMP signl ours on the ylinder 4 ompression stroke. When the intke mshfts re fully retrded (zero vlve overlp), the CMP signls swith from 0 to +5 volts t top ded enter ompression stroke of ylinders 1 nd 4 respetively. When the intke mshfts re fully dvned (mximum vlve overlp), the signls swith t 40 rnkshft degrees efore top ded enter. These signls llow the ECM to determine fuel injetor nd ignition oil sequene, s well s the tul intke vlve timing. Loss of one CMP signl will set DTC, nd vlve timing defults to the fully retrded position (zero vlve overlp). If neither CMP signl is deteted during rnking, the ECM stores DTC nd disles the fuel injetors, resulting in no-strt ondition. The sensors re not djustle. The digrm t the ottom of this pge shows the CKP nd CMP sensor signl wveforms with the mshfts t the defult (fully retrded) position. CRANKSHAFT POSITION (CKP) SENSOR A mgneti-type sensor tht genertes 35 pulses for eh rnkshft revolution. Loted on the front engine over. Triggered y relutor wheel mounted on the rnkshft, ehind the lner pulley. Eh tooth is ten rnkshft degrees prt, with one spe for missing tooth loted t 60 degrees efore top ded enter of ylinder numer 1. The digrm t the ottom of this pge shows the CKP sensor signl wveform. CKP Signl 5.0 VAC Minimum CMP 1 Signl 5.0 VDC CMP 2 Signl 5.0 VDC 60 BTDC TDC 60 BTDC TDC Cylinder #1 Cylinder #1 Cylinder #1 Cylinder #4 Compression Stroke Compression Stroke CMP signls shown t the defult (fully retrded) position PAGE 12 ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET

13 EGR VALVE POSITION SENSOR A three-wire non-djustle potentiometer tht senses the position of the EGR vlve pintle. Sensor output vries from 0.50 volts (vlve fully losed) to 4.50 volts (vlve fully open). Loted on top of the EGR vlve. EGR Vlve (% open) Sensor Voltge EGR Vlve ( / open) EGR Vlve Position Sensor EGR Vlve Position Sensor Voltge FUEL LEVEL SENSOR A potentiometer tht is used to determine the fuel level. Sensor output vries from 0.5 volts t 0 % (empty tnk) to 4.5 volts t 100 % (full tnk). Fuel tnk t 1/4 full = 1.5 volts. Fuel tnk t 3/4 full = 3.5 volts. Used y the ECM when testing the evportive emission (EVAP) system. Loted in the fuel tnk. Fuel Level (% full) Sensor Voltge Fuel Level ( / full) Fuel Level Sensor Fuel Level Sensor Voltge ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET PAGE 13

14 FUEL PRESSURE (FP) SENSOR A four-wire, omined, solid-stte sensor used to monitor system pressure. Loted on the fuel ril. (Also see: Temperture Sensors > Fuel Temperture (FT) Sensor) Sensor output vries from 0.50 volts t 0 psi to 4.50 volts t 90 psi. At 60 psi, the pressure sensor reding is 3.2 volts. Mesurement is referened to tmosphere nd will mth mehnil guge pressure. Used y the ECM to mesure fuel system pressure nd s n input to determine ommnd signl output to the fuel pump ontrol module (FPCM). PAGE 14 Fuel Pressure (psi) Sensor Voltge FUEL TANK (EVAP) PRESSURE SENSOR Senses vpor pressure or vuum in the EVAP system ompred to tmospheri pressure. Sensor output vries from 0.5 volts t psi (-14 in. H2O) when under vuum, to 4.5 volts t psi (14 in. H2O) when pressurized. With no pressure or vuum in the fuel tnk (fuel p removed), the sensor output is 2.5 volts. Used y the ECM for OBD evportive emission system dignostis only. Loted on top of the fuel tnk. Fuel Tnk (EVAP) (in.h2o) Pressure (psi) Sensor Voltge Fuel Pressure Sensor KNOCK SENSORS Two-wire piezoeletri sensors tht generte n AC voltge spike when engine virtions within speified frequeny rnge re present. Loted on eh nk of the engine lok. The signl is used y the ECM to retrd ignition timing when knok is deteted. The sensor signl iruit normlly mesures 2.5 volts DC with the sensor onneted. Fuel Pressure (psi) Fuel Tnk Pressure (psi) Fuel Pressure Sensor Voltge Fuel Tnk (EVAP) Pressure Sensor Fuel Tnk (EVAP) Pressure Sensor Voltge Fuel Tnk Pressure (in. H2O) ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET

15 HEATED OXYGEN SENSOR (HO2S 1/2 nd HO2S 2/2) Eletrilly heted zironi sensors. Mounted in the exhust pipe (downstrem) fter the front tlyti onverters on eh nk. Used for OBD monitoring of tlyti onverter effiieny. Sensor output vries from 0.0 to 1.0 volt. No is voltge is pplied to the sensor signl iruits y the ECM. With the key ON nd engine OFF, the sensor reding is zero volts. Bttery voltge is ontinuously supplied to the oxygen sensor heters when the ignition swith is ON. One the engine is strted, the ECM will provide the ground for the downstrem oxygen sensor heters fter two minutes of ontinuous engine opertion. Norml oxygen sensor heter resistne is 8-12 Ω t 68 F (20 C). IGNITION SWITCH Provides ignition key position input to the ECM. With the key in the RUN position nd engine speed greter thn 400 rpm, if n ignition swith fult is deteted the engine will ontinue to run. IGN SW Pin / ECM Pin 221 IGN SW Pin / ECM Pin 222 IGN SW Pin / ECM Pin 223 IGN SW Pin d / ECM Pin 224 OFF 0.0 V B+ B+ B+ ACC B+ 0.0 V B+ B+ RUN B+ B+ 0.0 V B+ START B+ B+ B+ 0.0 V MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR Senses intke mnifold solute pressure. Loted on the intke mnifold. Used y the ECM for OBD dignostis nd rometri pressure (BARO) lultion. ECM determines tmospheri ltitude (BARO) during key ON/engine OFF. The norml BARO for the vehile is se level; 30 in. Hg (101 kp). MAP sensor output vries etween 4.5 volts (0 in. Hg vuum / 101 kp pressure) to 0.5 volts (24 in. Hg vuum / 20.1 kp pressure). Sensor output is 4.50 volts (0 in. Hg vuum / 101 kp pressure) t key ON/engine OFF t se level. Sensor output is 1.17 volts t se level with no lod idle t 20 in. Hg vuum (33.5 kp pressure). ECM uses MAP input t wide open throttle (WOT) engine opertion to updte BARO mesurement. Vuum t se level (in. Hg. Guge) Mnifold Asolute Pressure (kp) Sensor Voltge Vuum (in. Hg. Guge) Sensor Voltge ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET PAGE MAP Sensor Mnifold Asolute Pressure (kp)

16 MASS AIRFLOW (MAF) SENSOR A hot-wire design tht senses irflow into the intke mnifold. Loted on the ir lener housing. Sensor output vries from 0.2 volts (0 gm/se) t key ON/engine OFF, to 4.8 volts (175 gm/se) t mximum irflow. At se level, no-lod idle (850 rpm), the sensor reding is 0.85 volts (3.0 gm/se). Mss Airflow (gm/se) Sensor Voltge Mss Airflow (gm/se) MAF Sensor MAF Sensor Voltge THROTTLE POSITION (TP 1 AND TP 2) SENSORS A pir of redundnt non-djustle potentiometers tht sense throttle position. Loted on the throttle ody ssemly. The TP 1 sensor output vries from 4.5 volts t losed throttle to 0.5 volts t mximum throttle opening (deresing voltge with inresing throttle position). The TP 2 sensor signl vries from 0.5 volts t losed throttle to 4.5 volts t mximum throttle opening (inresing voltge with inresing throttle position). A iruit filure of one TP sensor will set DTC nd the ECM will limit the mximum throttle opening to 35 %. Ciruit filure of oth TP sensors, or orreltion error, will set DTC, nd will disle TAC. When disled, the spring-loded throttle plte returns to the defult 15 % position (fst idle). Throttle Position (% open) PAGE 16 TP 1 Sensor Voltge TP 2 Sensor Voltge Throttle Position ( / ) Throttle Position Sensors TP 1 TP TP Sensor Voltge ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET

17 TEMPERATURE SENSORS ENGINE COOLANT TEMPERATURE (ECT) SENSOR A negtive temperture oeffiient (NTC) thermistor tht senses engine oolnt temperture. Loted in the engine lok wter jket. Mesures tempertures from -40 F to 248 F (-40 C to 120 C). At 212 F (100 C), the sensor reding is 0.46 volts. FUEL TEMPERATURE (FT) SENSOR A four-wire, omined, solid-stte sensor used to monitor fuel system temperture. A negtive temperture oeffiient (NTC) thermistor tht senses fuel ril temperture. Loted on the fuel ril. (Also see Fuel Pressure (FP) Sensor). Mesures tempertures from -40 F to 248 F (-40 C to 120 C). At 86 F (30 C), the temperture sensor reding is 2.6 volts. The signl is used y the ECM to mesure fuel system temperture nd s n input to determine ommnd signl output to the fuel pump ontrol module (FPCM). INTAKE AIR TEMPERATURE (IAT) SENSOR A negtive temperture oeffiient (NTC) thermistor tht senses ir temperture. Loted in the ir lener housing. Mesures tempertures from -40 F to 248 F (-40 C to 120 C). At 86 F (30 C), the sensor reding is 2.6 volts. TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR A negtive temperture oeffiient (NTC) thermistor tht senses trnsmission fluid temperture. Loted in the trnsxle oil pn. Mesures tempertures from -40 F to 248 F (-40 C to 120 C). At 212 F (100 C), the sensor reding is 0.46 volts. This signl is used y the TCM to dely shifting when the fluid is old, nd ontrol torque onverter luth opertion when the fluid is hot. Temperture F Temperture C Sensor Voltge ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET PAGE 17

18 TRANSMISSION RANGE (TR) SWITCH A five-position swith tht indites the position of the trnsxle mnul selet lever: PARK, REVERSE, NEUTRAL, DRIVE (D), or LOW (L). Loted on the trnsxle housing. Used y the TCM to ontrol line pressure, upshifting, nd downshifting. TRANSMISSION TURBINE SHAFT SPEED (TSS) SENSOR A mgneti-type sensor tht senses rottion of the torque onverter turine shft (input/minshft). Loted on the trnsxle housing. Genertes signl tht inreses in frequeny s trnsmission input speed inreses. Used y the TCM to ontrol torque onverter luth opertion nd sense trnsmission slippge. VARIABLE VALVE LIFT SYSTEM SENSORS Two, three-wire, non-djustle potentiometers tht sense the vrile vlve lift motor shft position for eh vrile vlve lift motor. Loted in the vrile vlve lift motor ssemlies. Sensor output will red 0.50 V t low lift (0 % ommnd) nd 4.50 V t high lift (100 % ommnd). Norml ECM ommnd of the motors t idle is se lift. At wide open throttle (WOT), mximum lod, the ECM ommnds mximum dditionl lift. VEHICLE SPEED SENSOR (VSS) A mgneti-type sensor tht senses rottion of the finl drive. Loted on the trnsxle housing. Genertes signl tht inreses in frequeny s vehile speed inreses. The TCM uses the VSS signl to ontrol upshifts, downshifts, nd the torque onverter luth. The TCM ommunites the VSS signl over the dt ommunitions us to the ECM to ontrol high speed fuel utoff, nd to the Instrument Cluster for speedometer opertion. The signl is displyed on the sn tool in miles per hour nd kilometers per hour. PAGE 18 ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET

19 OUTPUTS - ACTUATORS A/C CLUTCH RELAY When energized, the rely provides ttery voltge (B+) to the A/C ompressor luth oil. Coil resistne speifition is 36 ± 4 Ω. CAMSHAFT POSITION ACTUATOR CONTROL SOLENOIDS A pir of duty-yle ontrolled solenoid vlves tht modify the vlve timing of the intke mshfts y ontrolling engine oil flow to the mshft position tutors. As duty yle inreses, oil flows from the solenoid to the tutor dvning the mshft position. As the duty yle dereses, the mount of oil flow from the solenoid is redued llowing the mshft to move k towrds the rest position. When the ECM determines tht the desired mshft position hs een hieved, the duty yle is ommnded to 50 % to hold the tutor so tht the djusted mshft position is mintined. The solenoid winding resistne speifition is 12 ± 2 Ω. EVAPORATIVE EMISSION (EVAP) CANISTER PURGE SOLENOID Duty yle ontrolled regultion of EVAP nister purge vpor flow into the intke mnifold. Enled when the engine oolnt temperture rehes 150 F (66 C). A duty yle of 0 % loks vpor flow, nd duty yle of 100 % llows mximum vpor flow. The duty yle is determined y the ECM, sed on engine speed nd lod. Also used for OBD testing of the evportive emission (EVAP) system. A servie port with shrder vlve is on the hose etween the purge solenoid nd the nister. Winding resistne speifition is 36 ± 4 Ω. EVAPORATIVE EMISSION (EVAP) CANISTER VENT SOLENOID When energized, the fresh ir supply hose to the nister is loked. Energized only during OBD testing of the evportive emission (EVAP) system. Winding resistne speifition is 36 ± 4 Ω. EXHAUST GAS RECIRCULATION (EGR) VALVE A duty yle ontrolled solenoid tht ontrols the spring-loded EGR vlve pintle. A sn tool vlue of 0 % indites n ECM ommnd to fully lose the EGR vlve. A sn tool vlue of 100 % indites n ECM ommnd to fully open the EGR vlve. Enled when engine oolnt temperture rehes 150 F (66 C) nd throttle is not losed or wide open. Winding resistne speifition is 12 ± 2 Ω. FAN CONTROL (FC) RELAY When energized, the rely provides ttery voltge (B+) to the rditor/ondenser ooling fn motor. Energized when engine oolnt temperture rehes 220 F (104 C); off when oolnt temperture drops to 195 F (90 C). Energized when the A/C high side pressure rehes 300 psi (2068 kp); off when the pressure drops to 250 psi (1724 kp). Coil resistne speifition is 36 ± 4 Ω. FUEL INJECTORS Eletromehnil devies used to deliver fuel to the intke mnifold t eh ylinder. Eh individully energized one per mshft revolution, in time with its ylinder s exhust stroke. Winding resistne speifition is 12 ± 2 Ω. GENERATOR The ECM supplies vrile duty-yle signl to ground the field winding of the genertor (lterntor). The ECM reeives ttery/hrging voltge input t pin 219. This pin is dedited genertor input. Inresed duty yle results in higher field urrent nd greter genertor (lterntor) output. ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET PAGE 19

20 IGNITION COILS Coil-on-plug (COP) system with six individul oils onneted diretly to the sprk plugs. Timing nd dwell re ontrolled y the ECM. Coil primry resistne speifition is 1 ± 0.5 Ω. Coil seondry resistne speifition is 10K ± 2K Ω. MALFUNCTION INDICATOR LAMP (MIL) Prt of the instrument luster module (ICM). Reeives ommnds from the ECM nd TCM over the dt ommunitions us. If the ICM is unle to ommunite with the ommunitions us network, the MIL will e lit. With no fults present, the MIL is lit for 5 seonds fter the ignition swith is turned ON (ul hek). An emissions-relted fult is present if the MIL stys lit fter the ul hek. When misfiring ours tht ould dmge tlyti onverter, the MIL flshes on nd off. STARTER RELAY When energized, provides ttery voltge (B+) to the strter solenoid. Energized sed upon ignition swith position (START), trnsmission rnge swith position (PARK/ NEUTRAL), vehile speed (0 mph), nd engine speed (0 rpm). Coil resistne speifition is 36 ± 4 Ω. THROTTLE ACTUATOR CONTROL (TAC) MOTOR A idiretionl pulse-width modulted DC motor tht ontrols the position of the throttle plte. Sn tool dt vlue of 0 % = ECM ommnd to fully lose throttle plte. Sn tool vlue of 100 % = ECM ommnd to fully open the throttle plte (wide open throttle). Any throttle ontrol tutor motor iruit fult sets DTC nd using the TAC to e disled, nd the spring-loded throttle plte will return to the defult 15 % position (fst idle). When disled, the TAC vlue on the sn tool will indite 15 %. Mximum throttle tutor ontrol motor urrent is 6 mps. TRANSMISSION SOLENOIDS TORQUE CONVERTER CLUTCH (TCC) SOLENOID VALVE This normlly low (NL) vrile fore solenoid ontrols fluid in the trnsmission vlve ody tht is routed to the torque onverter luth. TCM vries duty yle to mintin ontrolled slip or full pplition of the luth (zero slip). Sn tool duty yle vlue of 0 % = TCC is relesed. When torque onverter luth pplition is desired, the pulse width inreses. Sn tool duty yle vlue of 100 % = TCC is fully pplied. The duty yle is immeditely ut to 0 % (relesed) if the rke pedl position swith loses. Enled when the engine oolnt temperture rehes 150 F (66 C), the rke swith is open, the trnsmission is in 3rd ger or higher, nd the vehile is t ruise (stedy throttle) ove 35 mph. Winding resistne speifition is 6 ± 1 Ω. TRANSMISSION ELECTRONIC PRESSURE CONTROL (EPC) SOLENOID This normlly high (NH) vrile fore solenoid ontrols fluid in the trnsmission vlve ody tht is routed to the pressure regultor vlve. TCM vries duty yle to modify the line pressure of the trnsmission for est shift qulity. Sn tool duty yle vlue of 10 % = mximum line pressure ommnd. Sn tool duty yle vlue of 90 % = minimum line pressure is ommnded. Winding resistne speifition is 6 ± 1 Ω. PAGE 20 ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET

21 TRANSMISSION SHIFT SOLENOIDS (SS A, SS B, SS C, SS D, nd SS E) Control fluid flow to the luthes. Loted in the trnsmission vlve ody. SS A nd SS D re normlly low (NL) vrile fore solenoids. SS B nd SS C re normlly high (NH) vrile fore solenoids. SS E is n OFF/ON solenoid tht is normlly losed (NC). By modifying the duty yle of the vrile fore solenoids nd hnging the stte of the ON/OFF solenoid, the TCM n ontrol the pressure to the luthes to enle ger hnge. Winding resistne speifition is 6 ± 1 Ω, exept for SS E whih is 22 ± 2 Ω. Ger Seletor Position PCM Ger Commnd Cluth 3-5-R Cluth 2-6 Cluth L-R Cluth Cluth Low/ One-Wy Cluth SS A (VFS) Cluth NL SS B (VFS) L-R/ NH SS C (VFS) 3-5-R NH SS D (VFS) 2-6 NL SS E (OFF/ON) NC P P Applied OFF OFF ON OFF ON R R Applied Applied OFF OFF OFF OFF ON 2.88:1 N N Applied OFF OFF ON OFF ON D 1 Applied Applied Applied ON OFF ON OFF ON 4.48:1 Ger Rtio 2 Applied Applied OR ON ON ON ON OFF 2.87:1 3 Applied Applied OR ON ON OFF OFF OFF 1.84:1 4 Applied Applied OR ON OFF ON OFF OFF 1.41:1 5 Applied Applied OR OFF OFF OFF OFF OFF 1:1 6 Applied Applied OR OFF OFF ON ON OFF 0.74:1 L L Applied Applied Applied ON OFF ON OFF ON 4.48:1 VFS = Vrile Fore Solenoid NL = Normlly Low OR = Over Running NC = Normlly Closed NH = Normlly High Normlly Low (NL): When this solenoid type is OFF (not energized), fluid pressure is low, fluid is exhusted from the iruit, nd the luth is not pplied. When the solenoid is ON (energized), the TCM inreses the fluid pressure y vrying the solenoid duty yle nd the luth is pplied. Normlly High (NH): When this solenoid type is OFF (not energized), fluid pressure is high in the fluid iruit nd the luth is pplied. When the solenoid is ON (energized), the TCM redues the fluid pressure y vrying the solenoid duty yle nd the luth is relesed. Normlly Closed (NC): This solenoid type is either ON or OFF nd ontrols three-port hydruli iruit to id in shift strtegy. Regulted line pressure is swithed etween two hydruli ports, defult pssge, nd primry pssge. When this solenoid type is OFF (not energized), oil is loked from the primry oil pssge nd fed to defult pssge. When the solenoid is ON (energized), the TCM redirets the fluid pressure to the primry oil pssge. VARIABLE VALVE LIFT MOTORS A idiretionl DC motor tht ontrols the position of the vrile vlve lift mehnism. DC motor is tthed to rod whih opertes fulrum tthed to the roker rms. Chnges in roker rm rtio result in dditionl lift ove the se lift provided y the mshft loes. Sn tool vlue elow 3000 rpm = 0.5 V (0 %). Sn tool vlue ove 3000 rpm = 4.5 V (100 %). ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET PAGE 21

22 OBD SYSTEM OPERATION DATA COMMUNICATIONS POWERTRAIN COMMUNICATIONS NETWORK High-speed, seril dt us. Two-wire twisted pir ommunitions network. Allows peer-to-peer ommunitions etween the ECM, TCM, instrument luster (inluding the MIL), immoilizer ontrol module, nd sn tool onneted to the dt link onnetor (DLC). Dt-High iruit swithes etween 2.5 (rest stte) nd 3.5 volts (tive stte). Dt-Low iruit swithes etween 2.5 (rest stte) nd 1.5 volts (tive stte). Two, 120-ohm terminting resistors: one inside the instrument luster nd nother inside the ECM. Any of the following onditions will use seril dt us ommunitions to fil nd result in the storge of network DTCs: either dt line shorted to voltge. either dt line shorted to ground. one dt line shorted to the other dt line. n open in either dt line to module. Dt us remins opertionl when one of the two modules ontining terminting resistor is not onneted to the network. Dt us will fil when oth terminting resistors re not onneted to the network. Communition filures will not prevent the ECM from providing ontrol of the ignition system. FUEL PUMP CONTROL MODULE (FPCM) COMMUNICATIONS NETWORK Lol Are Network (LAN) us. Two-wire, twisted pir ommunitions network; isolted from the powertrin ommunitions network. Allows peer-to-peer ommunitions etween the ECM nd the FPCM only. LAN Dt-High iruit swithes etween 2.5 (rest stte) nd 3.5 volts (tive stte). LAN Dt-Low iruit swithes etween 2.5 (rest stte) nd 1.5 volts (tive stte). Any of the following onditions will use LAN dt us ommunitions to fil: either dt line shorted to voltge. either dt line shorted to ground. either dt line open. one dt line shorted to the other dt line. FUEL PUMP CONTROL MODULE LAN Dt Low LAN Dt High Dt High ENGINE 131 CONTROL MODULE Dt Low 120 Ω 130 Dt Low Dt High IMMOBILIZER MODULE DATA LINK CONNECTOR TRANSMISSION CONTROL MODULE Dt High Dt Low Dt Low 120 Ω Dt High INSTRUMENT CLUSTER MODULE PAGE 22 ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET

23 SYSTEM MONITORS The OBD dignosti system lso tively tests some systems for proper opertion while the vehile is eing driven. Fuel ontrol nd engine misfire re heked ontinuously. Air/fuel rtio sensor response, ir/fuel rtio sensor heter opertion, oxygen sensor response, oxygen sensor heter opertion, tlyst effiieny, EGR opertion nd EVAP integrity re tested one or more per trip. When ny of the System Monitors detets filure tht will result in emissions exeeding predetermined level on two onseutive trips, the ECM will store dignosti troule ode (DTC) nd illuminte the mlfuntion inditor lmp (MIL). Freeze frme dt ptured during the first of the two onseutive filures is lso stored. AIR/FUEL RATIO & OXYGEN SENSORS Cheks the mximum nd minimum signl output nd response times for ll ir/fuel rtio sensors nd oxygen sensors. If n ir/fuel rtio sensor or oxygen sensor signl remins too low, too high, responds too slowly, or does not respond, DTC is set. AIR/FUEL RATIO & OXYGEN SENSOR HEATERS Cheks the urrent flow through eh ir/fuel rtio sensor heter nd the oxygen sensor heter. If the urrent flow is too high or too low, DTC is set. Bttery voltge is ontinuously supplied to the ir/fuel rtio sensor heters nd oxygen sensor heters whenever the ignition swith is on. The heters re grounded through the ECM. CATALYTIC CONVERTER Compres the dt from the heted ir/fuel rtio sensors (upstrem) to the heted oxygen sensors (downstrem) to determine the oxygen storge pility of the tlysts. If tlyst s oxygen storge pity is suffiiently degrded, the ECM will store the pproprite DTC nd illuminte the MIL. Will run only fter the ir/fuel rtio sensor heter, oxygen sensor heter, ir fuel rtio sensor nd oxygen sensor monitors hve run nd pssed. COMPREHENSIVE COMPONENT Continuous monitor of ll engine nd trnsmission sensors nd tutors for shorts nd opens, s well s vlues tht do not logilly fit with other powertrin dt (rtionlity). On the first trip where filure is deteted, the ECM or TCM will store DTC. The ECM will then store freeze frme of dt nd illuminte the MIL. EGR SYSTEM Uses the MAP sensor signl to detet hnges in intke mnifold pressure s the EGR vlve is ommnded open nd losed. If the pressure hnges too little or too muh s ompred to the EGR vlve position sensor input, DTC is set. ENGINE MISFIRE Uses the CKP sensor signl to ontinuously detet engine misfires, oth severe nd non-severe. If the misfire is severe enough to use tlyti onverter dmge, the MIL will flsh on nd off s long s the severe misfire is deteted. ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET PAGE 23

24 EVAP SYSTEM Tests for smll leks (0.020 in./0.5 mm) nd lrge leks (.040 in./1.0 mm). Engine off, nturl vuum lek detetion is used to test for smll lek (0.020 in./0.5 mm). Enle riteri for the smll lek test: the vehile must hve een driven etween 15 to 90 minutes. fuel level must e etween 1/4 nd 3/4 full. mient ir temperture must e etween 40 F (4.4 C) nd 105 F (40 C). the key is OFF/the engine is OFF. When the key is turned OFF, the vent solenoid is left open for ten minutes to llow the system to stilize. The ECM then notes the fuel tnk pressure (FTP). The ECM then energizes the EVAP vent solenoid for four minutes while monitoring the fuel tnk pressure (FTP) sensor for pressure hnge. If the system rehes the trget vlue, hnge of greter thn 1.0 in. H2O from the stilized reding, the test is omplete nd the system psses (no lek deteted). If the system fils to pss the initil smll lek test, the ECM will then ommnd the EVAP vent solenoid open for two minutes. The ECM then notes the fuel tnk pressure (FTP). The ECM then energizes the EVAP vent solenoid for 20 minutes while monitoring the FTP sensor for hnge. A hnge in fuel tnk pressure of greter thn 1.0 in. H2O indites pss (no lek deteted). Vuum dey is used to test for lrge lek (.040 in./1.0 mm). Enle riteri for the lrge lek test: old strt with engine temperture elow 86 F (30 C). fuel level must e etween 1/4 nd 3/4 full. mient ir temperture must e etween 40 F (4.4 C) nd 105 F (40 C). the engine is running. The ECM turns on the EVAP vent solenoid, loking the fresh ir supply to the EVAP nister. The EVAP purge solenoid is turned on to drw slight vuum on the entire EVAP system, inluding the fuel tnk. Then the EVAP purge solenoid is turned off to sel the system. The monitor uses the Fuel Tnk (EVAP) Pressure Sensor signl to determine if the EVAP system hs ny leks. After the testing is ompleted, the EVAP vent solenoid is turned off to relieve the vuum. A smll lek DTC will set if suffiient hnge in fuel tnk pressure is not hieved during the smll lek test. A lrge lek DTC will set if suffiient vuum is not reted, or deys too rpidly, or does not dey quikly t the onlusion of the lrge lek test. FUEL CONTROL Uses fuel trim nd loop sttus to determine filures in the fuel system. Sets DTC if the system fils to enter Closed Loop mode within 2 minutes of strtup. Sets DTC if Long Term Fuel Trim rehes its limit (+30 % or -30 %) inditing loss of fuel ontrol. PAGE 24 ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET

25 MONITOR READINESS STATUS Indites whether or not the OBD dignosti monitor hs ompleted. If the monitor hs not ompleted, the sttus on the sn tool displys NOT COMPLETE. If the monitor hs ompleted, the sttus on the sn tool displys COMPLETE. When DTCs re lered from memory or the ttery is disonneted, ll non-ontinuous monitors will hve the rediness sttus inditors reset to NOT COMPLETE. The rediness sttus of the following non-ontinuous system monitors n e red on the sn tool: Ctlyti Converter EGR System EVAP System Oxygen Sensors Oxygen Sensor Heters WARM UP CYCLE Used y the ECM nd TCM for utomti lering of DTCs nd Freeze Frme dt (desried elow). Must hve n inrese of t lest 40 F (n inrese of 22 C) nd reh minimum of 160 F (71 C). TRIP A key-on yle in whih ll enle riteri for dignosti monitor re met nd the monitor is run. The trip ompletes when the ignition swith is turned off. DRIVE CYCLE Most OBD monitors will run t some time during norml opertion of the vehile. However, to stisfy ll of the different Trip enle riteri nd run ll of the OBD dignosti monitors, the vehile must e driven under vriety of onditions. The following drive yle will llow ll monitors to run on this vehile. Ensure tht the fuel tnk is etween 1/4 nd 3/4 full. Engine old strt elow 86 F (30 C). Engine wrm up until oolnt temperture is t lest 160 F (71 C). Aelerte to mph t 25 % throttle nd mintin speed for 5 minutes. Deelerte without using the rke (ost down) to 20 mph or less, nd then stop the vehile. Allow the engine to idle for 10 seonds, turn the key off, nd wit 1 minute. Restrt nd elerte to mph t 25 % throttle nd mintin speed for 2 minutes. Deelerte without using the rke (ost down) to 20 mph or less, nd then stop the vehile. Allow the engine to idle for 10 seonds, turn the key off, nd wit 45 minutes. FREEZE FRAME DATA A snpshot (one frme of dt) tht is utomtilly stored in the memory of either the ECM or TCM when n emission-relted DTC is first stored (pending). If DTC for fuel ontrol or engine misfire is stored t lter time, the newest dt is stored, repling the erlier dt. All prmeter ID (PID) vlues listed under Sn Tool Dt re stored in freeze frme dt. The ECM nd TCM store only one single freeze frme reord. ASE COMPOSITE VEHICLE TYPE 4 REFERENCE BOOKLET PAGE 25