ENINE CONTRO (Z-FE WD M/T) 7 IF 7 AM I 6 FROM POWER SOURCE SYSTEM (SEE PAE 4) AM ACC I 0A EFI 7. A OD 7. A IN ST W 30A AM W ATTERY 40A AM 0A AT I4 INITION SW - Y- R Y 0 C 9 CUTCH START SW 3 6 8 I F 7. A STA J 9 A, J0 JUNCTION CONNECTOR D E - Y 3 A D 7 DATA INK CONNECTOR 3 - Y EFI REAY 6 4 3A C 3A 3 6 IF AT S IK W 7 SI WFSE Y- R J JUNCTION CONNECTOR 3 Y- C C Y- TC J JUNCTION CONNECTOR - W - W W- F I 3 3 3 N7 4 M N7 - W - O - Y W C 6 CIRCUIT OPENIN REAY F 8 FUE PUMP W- Y- Y- R EA IE E I 78 003 TOYOTA TACOMA (EWD7U)
IK I3 I3 I3 I3 I3 FROM POWER SOURCE SYSTEM (SEE PAE 4) - W - O - Y W 3 IF IF F - Y 0A STOP - Y - O - W - Y S STOP IHT SW 7 6 - W - W 3F 3F I 6 INJECTOR NO. I 8 INJECTOR NO. 3 R I0 INJECTOR NO. W- I 7 INJECTOR NO. I 9 INJECTOR NO. 4 - R I INJECTOR NO. 6 -R 4 A 6 A 4 A A 0 A 6 C 4 C C C 3 C 8 C SI ATT MRE ISW STP #0 # 30 # 0 #0 # 40 # 60 E A, E 6 ENINE CONTRO MODUE, E 7 C, E 8 D + A TP EP FC TC WFSE STA E THA E PSW THW 0 C 4 C A 7 C 3 A 7 A 0 D D 3 D D 8 C 8 D 3 7 IF 4 6 S (PRESSURE SWITCHIN AE) - - - IK6 N7 4 S (EAP) W- W- Y- M MASS AIR FOW METER - W 3 4 Y- - R - R EE - EE E 3 ENINE COOANT TEMP. SENSOR P0 POWER STEERIN OI PRESSURE SW 8 IK Y- Y- R I4 3 N7 3 IK I3 I3 I3 I3 W- Y- Y- R Y- Y- I4 FROM CRUISE CONTRO ECU 003 TOYOTA TACOMA (EWD7U) 79
ENINE CONTRO (Z-FE WD M/T) A A/C CONTRO ASSEMY TO CRUISE CONTRO ECU I INITER 7 6 4 0 9 - Y - - R - W - Y 9 A 3 A C 0 C 9 C C AC ACT IDO IT IT IT3 IF E A, E 6 ENINE CONTRO MODUE, E 7 C, E 8 D TA D C D PTNK 4 D RSO RSC 6 C 4 C KNK 3 D KNK D HAF AF+ D 4 D AF- 6 D - Y R- Y Y - Y I3 3 N7 E - Y R W R- Y - R 7 A CC 9 C - Y 8 IK6 - Y 4 N7 IK6 R- Y I3 I3 P P- 3 3 3 T THROTTE POSITION SENSOR I3 8 APOR PRESSURE SENSOR N7 IK I IDE AIR CONTRO AE K KNOCK SENSOR ED 3 ED E K 3 KNOCK SENSOR R ED 3 4 A3 AIR FUE RATIO SENSOR (ANK SENSOR ) I3 S (CANISTER COSED AE) W-R W-R W-R W-R I3 I3 I3 I3 80 003 TOYOTA TACOMA (EWD7U)
FROM POWER SOURCE SYSTEM (SEE PAE 4) I3 0A AUE C CRANKSHAFT POSITION SENSOR C CAMSHAFT POSITION SENSOR - O F I3 R - O 4 9 0 7 C C 3 C 6 A 9 D R- W R - R I3 I3 - O NE- NE+ SP C0 3 COMINATION METER HT E A, E 6, E 7 C, E 8 D ENINE CONTRO MODUE OX E E0 E0 E03 E04 W 7 D 7 C 4 D D 7 D 8 D A SPEEDOMETER CONTRO CIRCUIT MAFUNCTION INDICATOR AMP I3 IK IK I 4 IK - R 7 8 9 - R 0 IK 6 IK - R - R IK 3 4 H 9 HEATED OXYEN SENSOR (ANK SENSOR ) 7 3 3 0 EHICE SPEED SENSOR IK 9 3 R- W R E ID 003 TOYOTA TACOMA (EWD7U) 8
ENINE CONTRO (Z-FE WD M/T) SYSTEM OUTINE 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 SINA () 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 water temp. Thus the engine coolant temp. is input in the form of a control signal to TERMINA THW of the engine control module. () Intake air temp. signal system The intake air temp. sensor is installed inside the mass air flow meter and detects the intake air temp., which is input as a control signal to TERMINA THA of the engine control module. (3) Heated oxygen sensor signal system The oxygen density in the exhaust emissions is detected and input as a control signal to TERMINA OX of the engine control module. To maintain stable detection performance by the heated oxygen sensor, a heater is used for warming the sensor. The heater is also controlled by the engine control module (HT). (4) 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 TERMINA of the engine control module, and engine RPM is input to TERMINA NE+. () Throttle signal system The throttle position sensor detects the throttle valve opening angle, which is input as a control signal to TERMINA TA of the engine control module. (6) ehicle speed signal system The vehicle speed sensor detects the vehicle speed and inputs a control signal to TERMINA SP of the engine control module via the combination meter. (7) A/C SW signal system The operating voltage of the A/C magnetic clutch is detected and input in the form of a control signal to TERMINA AC of the engine control module. (8) attery signal system oltage is constantly applied to TERMINA ATT of the engine control module. When the ignition SW is turned to on, voltage for engine control module operation is applied via the EFI relay to TERMINA + of the engine control module. (9) Intake air volume signal system Intake air volume is detected by the mass air flow meter and a signal is input into TERMINA of the engine control module as a control signal. (0) Stop light SW signal system The stop light SW is used to detect whether or not the vehicle is braking and the information is input as a control signal to TERMINA STP of the engine control module. () 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 TERMINA STA of the engine control module. () Engine knock signal system Engine knocking is detected by the knock sensor and and the signals are input to TERMINAS KNK and KNK of the engine control module. (3) 4WD signal system Whether or not the vehicle is operating in 4WD mode is determined, and a control signal is input to TERMINA 4WD of the engine control module. (4) Air fuel ratio signal system The air fuel ratio is detected and input as a control signal into TERMINA AF+ of the engine control module. 8 003 TOYOTA TACOMA (EWD7U)
. CONTRO SYSTEM SFI system The SFI system monitors the engine conditions through the signals (Input signals ( to 3) ) input from each sensor 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 decided and current is output to TERMINAS #0, #0, #30, #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. Electronic Spark Advance system The ESA system monitors the engine conditions using the signals (input signals (, 4, to 7, 9,, ) ) input to the engine control module from each sensor. ased on this data and the program memorized in the engine control module, the most appropriate ignition timing is decided and current is output to TERMINAS IT,IT and IT3 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 low), and warms up the heated oxygen sensor to improve detection performance of the sensor. The engine control module evaluates the signals (Input signals (, 4, 8, 9, ) ) from each sensor, current is output to TERMINA HT and controls the heater. 3. DIANOSIS SYSTEM With 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. FAI-SAFE SYSTEM When a malfunction occurs in any system, if there is a possibility of engine trouble 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. 003 TOYOTA TACOMA (EWD7U) 83
ENINE CONTRO (Z-FE WD M/T) SERICE HINTS EFI REAY -3 : Closed with ignition SW at ON or ST position C6 CIRCUIT OPENIN REAY -3 : Closed with starter running or ignition SW at ON or ST position I6, I7, I8, I9, I0, I INJECTOR - : 3.4-4. Ω T THROTTE POSITION SENSOR - : 4-9 kω E3 ENINE COOANT TEMP. SENSOR - : 0-0 kω (-0 C, -4 F) 4-7 kω (0 C, 3 F) - 3 kω (0 C, 68 F) 0.9-.3 kω (40 C, 04 F) 0.4-0.7 kω (60 C, 40 F) 0.- 0.4 kω (80 C, 76 F) E (A), E6 (), E7 (C), E8 (D) ENINE CONTRO MODUE oltage at engine control module wiring connectors +-E : 9-4 volts (Ignition SW on) ATT-E : 9-4 volts (Always) C-E : 4.-. volts (Ignition SW on ) TA-E : 0.3-0.8 volts (Ignition SW on and throttle valve fully closed) 3.- 4.9 volts (Ignition SW on and throttle valve fully open) STA-E : 6 volts or more (Ignition SW at ST position) W-E : 9-4 volts (No trouble and engine running) THA-E : 0.- 3.4 volts (Ignition SW on and intake air temp. 0 C, 68 F) THW-E : 0.-.0 volts (Ignition SW on and coolant temp. 80 C, 76 F) SP-E : Pulse generation with vehicle moving STP-E : 7.- 4 volts (Stop light SW on) IT, IT, IT3-E : Pulse generation (Cranking or idling) #0, #0, #30, #40, #0, #60-E : 9-4 volts (Ignition SW on) RESISTANCE AT ECU WIRIN CONNECTOR (Disconnect wiring connector) TA-E : 3.3-0 kω (Throttle valve fully open) 0.- 0.8 kω (Throttle valve fully closed) THA-E : - 3 kω (Intake air temp. 0 C, 68 F) THW-E : 0.- 0.4 KΩ (Coolant temp. 80 C, 78 F) +-E : 0.- 0.4 kω NE+ -E : 40-80 Ω : PARTS OCATION Code See Page Code See Page Code See Page A3 30 (Z-FE) F8 37 (Except Double Cab) K 3 (Z-FE) A 34 H9 3 K3 3 (Z-FE) C 30 (Z-FE) I 3 (Z-FE) M 3 (Z-FE) C 30 (Z-FE) I 3 (Z-FE) P0 3 (Z-FE) C6 34 I6 3 (Z-FE) S 3 C9 34 I7 3 (Z-FE) T 3 (Z-FE) C0 34 I8 3 (Z-FE) 4 3 (Z-FE) D7 34 I9 3 (Z-FE) 36 (Double Cab) 8 E3 30 (Z-FE) I0 3 (Z-FE) 37 (Except Double Cab) E A 3 I 3 (Z-FE) 0 3 (Z-FE) E6 3 I4 3 3 (Z-FE) E7 C 3 J9 A 3 (Z-FE) 36 (Double Cab) E8 D 3 J0 3 (Z-FE) 37 (Except Double Cab) F8 36 (Double Cab) J 3 84 003 TOYOTA TACOMA (EWD7U)
: REAY OCKS Code See Page Relay locks (Relay lock ocation) R/ No. (Engine Compartment eft),,,,,, : JUNCTION OCK AND WIRE HARNESS CONNECTOR Code See Page Junction lock and Wire Harness (Connector ocation) F 3 Cowl Wire and J/ No. (ower Finish Panel) I 3 Engine Room Main Wire and J/ No. (ower Finish Panel) 3A 3 4 Cowl Wire and J/ No.3 (ehind the Instrument Panel eft) 3F : CONNECTOR JOININ WIRE HARNESS AND WIRE HARNESS Code See Page Joining Wire Harness and Wire Harness (Connector ocation) ED 40 (Z-FE) Sensor Wire and Engine Wire (Over the Cylinder Head) EE 40 (Z-FE) Engine Wire and Sensor Wire (Over the Cylinder Head) IF 44 Engine Room Main Wire and Cowl Wire (eft Kick Panel) IK IK6 N7 44 Engine Wire and Cowl Wire (Above the love ox) 46 (Double Cab) 48 (Except Double Cab) Frame Wire and Cowl Wire (Under the Driver s Seat) : ROUND POINTS Code See Page round Points ocation EA 40 (Z-FE) Front eft Fender E 40 (Z-FE) Near the Throttle ody ID 44 eft Kick Panel IE 44 Around the Right Edge of the Reinforcement I 44 Around the eft Edge of the Reinforcement : SPICE POINTS Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points E 40 (Z-FE) Sensor Wire I3 44 Engine Wire E 40 (Z-FE) Engine Wire I4 I3 44 Cowl Wire I 44 Cowl Wire 003 TOYOTA TACOMA (EWD7U) 8