ENGINE CONTROL (VZ-FE) SYSTEM OUTLINE The engine control system utilizes a microcomputer and maintains overall control of the engine transmission etc. An outline of engine control is given here.. INPUT SIGNAL () Engine coolant temp. signal system The engine coolant temp. sensor detects the engine coolant temp. and has a built-in thermistor with a resistance which varies according to the engine coolant temp. The engine coolant temp. is input as a control signal to TERMINAL TH of the engine control module. () Heated oxygen sensor signal system The oxygen density in the exhaust emissions is detected and input as a control signal to TERMINAL OX or OX of the engine control module. To maintain stable detection performance by the heated oxygen sensor the heated oxygen sensors are warmed. The heater is also controlled by the engine control module (HT or HT). () RPM signal system Camshaft position and crankshaft position are detected by the camshaft position sensor and crankshaft position sensor camshaft position is input as a control signal to TERMINAL G+ of the engine control module and engine RPM is input to TERMINAL NE+. (4) Throttle signal system The throttle position sensor detects the throttle valve opening angle which is input as a control signal to TERMINAL VTA of the engine control module. () Vehicle speed signal system The vehicle speed sensor detects the vehicle speed and input to AS speed sensor of the AS ECU from AS ECU to TERMINAL SP of the engine control module. (6) A/C S signal system The operating voltage of the A/C magnetic clutch is detected and input as a control signal to TERMINAL AC of the engine control module. (7) attery signal system Voltage is constantly applied to TERMINAL ATT of the engine control module. hen the ignition S is turned to on voltage for engine control module operation is applied via the EFI relay to TERMINAL + of the engine control module. (8) Intake air volume signal system Intake air volume is detected by the mass air flow meter and a signal is input into TERMINAL VG of the engine control module as a control signal. (9) Stop light S signal system The stop light S is used to detect whether or not the vehicle is braking and the information is input as a control signal to TERMINAL K of the engine control module. (0) Starter signal system To confirm that the engine is cranking the voltage applied to the starter motor during cranking is detected and is input as a control signal to TERMINAL STA of the engine control module. () Engine knock signal system Engine knocking is detected by the knock sensor no. and no. and the signals are input to TERMINALS KNK and KNK of the engine control module. () 4D signal system (4D) hether or not the vehicle is operating in 4D module is determined and a control signal is input to TERMINAL 4D of the engine control module. () Intake air temp. signal circuit The intake air temp. sensor is installed in the mass air flow meter and detects the intake air temp. which is input as a control signal into TERMINAL THA of the engine control module. 7
. CONTROL SYSTEM SFI system The SFI system monitors the engine conditions through the signals each sensor (Input signals ( to )) inputs to the engine control module. ased on this data and the program memorized in the engine control module the most appropriate fuel injection timing is detected and current is output to TERMINALS #0 #0 #0 #40 #0 AND #60 of the engine control module causing the injectors to operate (to inject fuel). It is this system which through the work of the engine control module finely controls fuel injection in response to driving conditions. ESA system The ESA system monitors the engine conditions using the signals (Input signals ( 4 to 6 8 0 )) input to the engine control module from each sensor. ased on this data and the program memorizes in the engine control module the most appropriate ignition timing is decided and current is output to TERMINALS IGT IGT and IGT of the engine control module. This output controls the igniter to produce the most appropriate ignition timing for the driving conditions. Heated oxygen sensor heater control system The heated oxygen sensor heater control system turns the heater to on when the intake air volume is low (Temp. of exhaust emissions is low). And warms up the heated oxygen sensors to improve detection performance of the sensors. The engine control module evaluates the signals from each sensor (Input signals ( 7 8 0)) current is output to TERMINAL HT or HT and controls the heater.. DIAGNOSIS SYSTEM ith the diagnosis system when there is a malfunction in the ECU signal system the malfunctioning system is recorded in the memory. The malfunctioning system can then be found by reading the display (Code) of the malfunction indicator lamp. 4. FAIL- SAFE SYSTEM hen a malfunction occurs in any system if there is a possibility of engine being caused by continued control based on the signals from that system the fail-safe system either controls the system by using data (Standard values) recorded in the engine control module memory or else stops the engine. 7
ENGINE CONTROL (VZ-FE) I IG 8 II G- - R 7 AM IG 6 ST 8 I4 IGNITION S G- GR- 6 8 H J 7. A IGN FROM POER SOURCE SYSTEM (SEE PAGE 8) A EFI 7 IG 0A STOP 0 E 7 E G- - R STARTER RELAY EFI RELAY IG 4 G- Y G- Y IG G- S 4 STOP LIGHT S I I0 0A AM 00A ALT 40A AM A A A J A J JUNCTION CONNECTOR J JUNCTION CONNECTOR D 7 IE D C 6 CIRCUIT OPENING RELAY 6 L- O L- O L- O A A IE 4 F0 FUEL M PUMP G- Y 6 II G- Y ATTERY E 6 IG A IE J 4 JUNCTION CONNECTOR I TO UL CHECK RELAY [COM. METER] 74
I G- G- G- I 6 INJECTOR NO. R I I I I I I 7 INJECTOR NO. I 8 INJECTOR NO. I 9 INJECTOR NO. 4 I0 INJECTOR NO. G R- L I INJECTOR NO. 6 Y -R IG 7. A STA G- II TO ADD INDICATOR S G- (4D) E 9 A E0 E C E D ENGINE CONTROL MODULE D + 4 D 4 D 0 A 9 A ATT K #0 8 A 7 A 6 A A #0 # 0 # 40 # 0 # 60 FC STA THA VG E E PTNK VC VTA TH 8 A 8 7 C C 7 0 4 A NS 4D A G- Y G- Y 6 II G- Y 6 II M MASS AIR FLO METER Y- G R- - 4 - Y- V VAPOR PRESSURE SENSOR - THA VG E PTNK VCC + E E I - G- T THROTTLE POSITION SENSOR G- G- - I I VC E - Y VTA - EC E ENGINE COOLANT TEMP. SENSOR - G- Y G EC - I 7
ENGINE CONTROL (VZ-FE) FROM POER SOURCE SYSTEM (SEE PAGE 8) I F - Y 9 D 7 D - Y 0A GAUGE - Y 4 V II K KNOCK SENSOR NO. C MALFUNCTION INDICATOR LAMP [COM. METER] E E E E E I GR GR K KNOCK SENSOR NO. C C CRANKSHAFT CAMSHAFT POSITION SENSOR POSITION SENSOR I V P P L I V P C 4 6 7 KNK KNK NE+ NE- G+ E 9 A E0 E C E D ENGINE CONTROL MODULE RSO RSC EVP TPC TE A A C 8 C C C 0 C 9 HT OX HT OX D SP PS A I IDLE AIR CONTROL VALVE - R V 7 VSV (EVAP) - G V 8 VSV (VAPOR PRESSURE SENSOR) P- D DATA LINK CONNECTOR V- 8 4 4 H HEATED OXYGEN SENSOR (ANK SENSOR ) P- L TE HT OX I H 4 HEATED OXYGEN SENSOR (ANK SENSOR ) + E + E + E R- HT R OX I I G- O P POER STEERING OIL PRESSURE S FROM SPEEDOMETER [COM. METER] P I I I I I 76
I I I FROM POER SOURCE SYSTEM (SEE PAGE 8) I IGNITION COIL NO. R I 4 IGNITION COIL NO. - I IGNITION COIL NO. O TO TACHOMETER [COM. METER] V 7. A OD 0 9 8 IGC IGC IGC + EXT IGT IGT IGT IGF GND I IGNITER IG 7 6 4 - L - Y - Y 4 A 6 A A A 8 D IGT IGT IGT IGF SIL E E0 E0 E0 IDLO 6 C 4 A 8 A A D D 6 D ACT AC E 9 A E0 E C E D ENGINE CONTROL MODULE I8 - R V 7 6 SIL SG 4 Y- G L- L- Y AT CG D 7 DATA LINK CONNECTOR IJ 8 IJ 4 II 8 II 9 E I C8 CRUISE CONTROL ACTUATOR ITH ECU L- L- Y 8 8 IDL ACT AC A A/C AMPLIFIER - R 6 E I I A J 9 JUNCTION CONNECTOR EC EC IF 77
ENGINE CONTROL (VZ-FE) SERVICE HINTS EFI RELAY [ENGINE ROOM R/] - : Closed with ignition S at ON or ST position C6 CIRCUIT OPENING RELAY - : Closed with starter running or ignition S at ON position I6 I7 I8 I9 I0 I INJECTOR - :.4-4. Ω T THROTTLE POSITION SENSOR - :.- kω E ENGINE COOLANT TEMP. SENSOR - : 0-0 kω (-0 C -4 F) 4-7 kω (0C F) - kω (0C 68F) 0.9-. kω (40C 04F) 0.4-0.7 kω (60C 40F) 0.- 0.4 kω (80C 76F) E9 (A) E0 () E (C) E (D) ENGINE CONTROL MODULE Voltage at engine control module wiring connectors +-E : 9-4 volts (Ignition S on) ATT-E : 9-4 volts (Always) VC-E : 4.-. volts (Ignition S on) VTA-E : Approx. 0.6 volts (Ignition S on and throttle valve fully closed) Approx. 4 volts (ignition S on and throttle valve fully open) STA-E : 6 volts or more (Ignition S at ST position) -E : 9-4 volts (No trouble and engine running) TH-E : 0.-.0 volts (Ignition S on and coolant temp. 80C 76F) SP-E : Pulse generation with vehicle moving K-E : 7.- 4 volts (Stop light S on) IGT IGT IGT-E : Pulse generation (Cranking or idling) #0 #0 #0 #40 #0 #60-E : 9-4 volts (Ignition S on) RESISTANCE AT ECU IRING CONNECTOR (Disconnect wiring connector) TH-E : 0.- 0.4 kω (Coolant temp. 80C 76F) NE+-E : 40-80 Ω : PARTS LOCATION Code See Page Code See Page Code See Page A 0 H 6 (VZ-FE) J A 7 (VZ-FE) C 6 (VZ-FE) H4 6 (VZ-FE) J 7 (VZ-FE) C 6 (VZ-FE) I 7 (VZ-FE) J4 C6 0 I 7 (VZ-FE) J9 C 0 I 7 (VZ-FE) J C8 6 (VZ-FE) I4 7 (VZ-FE) K 7 (VZ-FE) D 6 (VZ-FE) I 7 (VZ-FE) K 7 (VZ-FE) D7 0 I6 7 (VZ-FE) M 7 (VZ-FE) E 6 (VZ-FE) I7 7 (VZ-FE) P 7 (VZ-FE) E9 A I8 7 (VZ-FE) S4 E0 I9 7 (VZ-FE) T 7 (VZ-FE) E C I0 7 (VZ-FE) V 7 (VZ-FE) E D I 7 (VZ-FE) V7 7 (VZ-FE) F0 I4 V8 7 (VZ-FE) 78
: RELAY LOCKS Code See Page Relay locks (Relay lock Location) 0 (USA) (Canada) Engine Room R/ (Engine Compartment Left) : JUNCTION LOCK AND IRE HARNESS CONNECTOR Code See Page Junction lock and ire Harness (Connector Location) F Cowl ire and Driver Side J/ (Lower Finish Panel) H J Engine Room Main ire and Driver Side J/ (Lower Finish Panel) A D 4 Cowl ire and Center J/ (Near the Steering Column Tube) E : CONNECTOR JOINING IRE HARNESS AND IRE HARNESS Code See Page Joining ire Harness and ire Harness (Connector Location) E 6 (VZ-FE) Sensor ire and Engine ire (Front Side of Cylinder Head Cover Right) EC 6 (VZ-FE) Engine ire and ater Temp. Sensor ire (Front Side of Cylinder Head Cover Right) IE 40 Cowl ire and Floor No. ire (Left Kick Panel) IG 40 Engine Room Main ire and Cowl ire (Left Kick Panel) II II 40 Engine ire and Cowl ire (On the Glove ox) IJ 40 Cowl ire and A/C Sub ire (Near the A/C Unit) : GROUND POINTS Code See Page Ground Points Location E 6 (VZ-FE) Front Left Fender EC 6 (VZ-FE) Intake Manifold Left IE 40 Cowl Side Panel LH IF 40 Cowl Side Panel RH : SPLICE POINTS Code See Page ire Harness with Splice Points Code See Page ire Harness with Splice Points E 6 (VZ-FE) Engine ire I0 40 Cowl ire E 6 (VZ-FE) Sensor ire I 40 Engine ire I 40 Engine Room Main ire I8 40 Cowl ire I 40 Cowl ire 79
ENGINE CONTROL (VZ-FE) A LACK C C LACK C6 C LUE X 8 4 X C8 LACK D LACK X 8 X X X X X X 8 X X X X X X X D7 LACK E DARK GRAY E9 (A) E0 () 6 X X X X X X X X 7 X 4 X X X X X 6 7 8 9 0 4 6 X X X X 4 X X 8 X X 4 X X 6 7 8 X X 4 X 7 8 9 0 E (C) E (D) F0 DARK GRAY H H4 DARK GRAY I GRAY X X 7 8 0 X X X 6 X X X 8 X X 4 6 X X X X X X 4 X X X X 4 4 I LACK I I4 I LACK I6 I7 I8 GRAY I9 I0 I GRAY 4 6 7 8 9 0 80
I4 J (A) J () GRAY J4 J9 J LACK X X 6 7 8 A A A A A A A A A A A A (Hint : See Page 7) X X X X X X D D D (Hint : See Page 7) (Hint : See Page 7) K K LACK M LACK P LACK (w/ Cruise Control) S4 (w/o Cruise Control) S4 LACK 4 X X T LACK V LACK V7 LACK V8 LUE 8