Engine Control COROLLA (EWD533U) B O B W B W I 7 I10. Ignition SW R W R W (A/T) (M/T) E 3 15A AM2. Junction Connector. Clutch Start SW B W B W

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1 Engine Control O 5 M IG 6 ST 4 I 7 I0 Ignition S 5 M 6 3 IM IM I4 I IC 5 IL 8 IK 5 E 3 3 E 0 E O 3 I II 0 I5 P N 6 E 9 30 MIN 5 EFI IG 9 ID IG II G G FL MIN. 0L 9 E 9 II 4 M 5 G (/T) G C 8 Clutch Start S (/T) (/T) (/T) (/T) J (), J 3() Park/Neutral Position S EFI elay C/OPN elay (/T) J () F0 Fuel Pump attery I0 ED H COOLL (ED533U)

2 O O E E E E 3 E 3 E 3 (/T) I Ignition Coil and Igniter No. L GND + GND + GND + GND IGT IGF IGT IGF IGF IGT IGF IGT L I 3 Ignition Coil and Igniter No. G L I 4 Ignition Coil and Igniter No. 3 L G I 5 Ignition Coil and Igniter No. 4 L F F F F (/T) L G J (), J 3() H L G L 8 NS 3 D TT IGT IGT IGT3 IGF IGT4 E 3(), E 4(), E 5(C), E 6(D) Engine Control Module ST FC 9 0 D E03 E0 E SO EVP (/T) G L L (/T) C C J 4(), J 5() DUT GND VISC 3 I Idle ir Control Valve V 3 VSV (EVP) G I0 I0 EC 004 COOLL (ED533U) 59

3 Engine Control O O From Power Source System (See Page 48) 8 II 0 M HT/ DEF I UP I0 I0 I0 8 IL I 6 Injector No. I 7 Injector No. I 8 Injector No. 3 I 9 Injector No. 4 L C Camshaft Timing Oil Control Valve (VVT) L D #0 #0 #30 #40 OCV+ OCV ELS E 3(), E 4(), E 5(C), E 6(D) Engine Control Module CCV EC PS VG EVG TH TH C II 0 II L G L L V VSV (Canister Closed Valve) P Power Steering Oil Pressure S 3 4 VG EG TH + E 5 M Mass ir Flow Meter E Engine Coolant Temp. Sensor I0 I0 IG J 7 Junction Connector COOLL (ED533U)

4 O O From Power Source System (See Page 48) 5 TIL 5 STOP Light Control S OFF Tail Head C Combination S 7 IH G (Canada) 3 0 G G (US) (US) G (US) G (US) G I 4 (Canada) TIL elay G 4 G IC S 9 Stop Light S 5 IC IL 3 3C 3C G G GS 7 II 6 IJ 3 irbag Sensor ssembly 3 3 IDL L (w/ Cruise Control) C4 Cruise Control ECU D 9 C 4 D 6 D ELS STP F/PS IDLO E 3(), E 4(), E 5(C), E 6(D) Engine Control Module E PTNK VC VT TP 8 D 8 4 D F H 7 II F H H J (), J 3() ID ID 3 3 D L L V 4 Vapor Pressure Sensor J (), J 3() Junction Connector LG T Throttle Position Sensor 8 ID V 5 VSV (Vapor Pressure Sensor) 6 ID 6 II 7 ID 004 COOLL (ED533U) 6

5 Engine Control O O * : Shielded FN NO. elay FN NO. elay M/G CLT elay /C S Defroster Mode Detection S /C S Defroster Mode Detection S Pressure S /C Thermistor C 3 Crankshaft Position Sensor J (), J 3() E E C Camshaft Position Sensor (*) (*) LG LG (*) G L (*) 7 D 6 D C 33 C 3 C 3 3 C FN CF CMG CLD /CS PS TH NE+ NE G+ HT OX + HT OX 4 3 D 4 C E 3(), E 4(), E 5(C), E 6(D) Engine Control Module P (*) (*) 8 II 9 II H 5 Heated Oxygen Sensor (ank Sensor ) 3 HT + E 4 OX H 8 Heated Oxygen Sensor (ank Sensor ) P (*) 4 HT + E 3 OX I0 6 II (*) (*) (*) I COOLL (ED533U)

6 O O From Power Source System (See Page 48) D Data Link Connector OD SIL TC FSE SG CG T IJ 3 3 4C II C L P P L P P (*) (*) 8 D 0 D 9 D SIL TC FSE E 3(), E 4(), E 5(C), E 6(D) Engine Control Module V (*) (*) (*) (*) E KNK EKNK SPD TCH 7 7 C 5 D THO 4 C D V K Knock Sensor J 4(), J 5() II J 6 Junction Connector E IE 004 COOLL (ED533U) 63

7 Engine Control O From Power Source System (See Page 48) 0 GUGE IG O (w/o S) 3 4 Malfunction Indicator Lamp Speedometer Tachometer C 9 Combination Meter 4 II (w/o S) C J 4(), J 5() V G 8 4C V 9 4C I G (w/ S) 4 I6 4 II G (w/ S) (w/o S) 7 3 SP G (w/o S) G (w/o S) (w/o S) C C (w/o S) J (), J 3() S Skid Control ECU with ctuator V Vehicle Speed Sensor (Combination Meter) E COOLL (ED533U)

8 System Outline The engine control system utilizes a microcomputer and maintains overall control of the engine, etc. n outline of engine control is given here.. Input Signals () 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. Thus the engine coolant temp. is input as a control signal to TEMINL TH of the engine control module. () Intake air temp. signal system 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 to TEMINL TH of the engine control module. (3) Power steering oil pressure signal system Power steering oil pressure is detected by the power steering oil pressure S and is input as a control signal to TEMINL PS of the engine control module. (4) PM 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 TEMINL G+ of the engine control module, and engine PM is input into TEMINL NE+. (5) Throttle signal system The throttle position sensor detects the throttle valve opening angle, which is input as a control signal to TEMINL VT of the engine control module. (6) Vehicle speed signal system The vehicle speed is detected by the S speed sensor and the signal is input to TEMINL SPD of the engine control module via the comb. meter and the skid control ECU with actuator. (w/ S) The vehicle speed is detected by the vehicle speed sensor installed in the transaxle and the signal is input to TEMINL SPD of the engine control module via the comb. meter. (w/o S) (7) NS signal system (/T) The Park/Neutral position S detects whether the shift position is in neutral or not, and inputs a control signal to TEMINL NS of the engine control module. (8) /C S signal system The operating voltage of the /C S is detected and is input as a control signal to TEMINL /CS of the engine control module. (9) attery signal system Voltage is constantly applied to TEMINL TT 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 TEMINL + of the engine control module. (0) Intake air volume signal system Intake air volume is detected by the mass air flow meter, and is input as a control signal to TEMINL VG of the engine control module. () ST 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 TEMINL ST of the engine control module. () Oxygen sensor signal system The oxygen density in the exhaust gases is detected and is input as a control signal into TEMINLS OX and OX of the engine control module. To maintain stable detection performance by the oxygen sensor, a heater is used for warming the sensor. The heater is also controlled by the engine control module (HT and HT). (3) Engine knock signal system Engine knocking is detected by the knock sensor and input as a control signal to TEMINL KNK of the engine control module. (4) Electrical load signal system hen systems which cause a high electrical load such as the rear window defogger, taillight are turned on, a signal is input to TEMINLS ELS and ELS as a control signal. (5) Vapor pressure signal system Vapor pressure is detected by the vapor pressure sensor and is input as a control signal to TEMINL PTNK of the engine control module. 004 COOLL (ED533U) 65

9 Engine Control. Control System SFI system The SFI system monitors the engine conditions through the signals, which are 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 TEMINLS #0, #0, #30 and #40 of the engine control module, operating the injectors (to inject fuel). This is the system which finely controls the fuel injection in response to the driving conditions, through the engine control module. ES system The ES system monitors the engine conditions using the signals, which are 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 TEMINLS IGT, IGT, IGT3 and IGT4 of the engine control module. This output controls the ignition coil and igniter No., No., No. 3 and No. 4 to produce the most appropriate ignition timing for the driving conditions. IC system The IC system increases the PM and provides idle stability for fast idle up when the engine is cold, and when the idle speed has dropped due to electrical load and so on. The engine control module evaluates the signals from each sensor, and outputs current to TEMINL SO to control the idle air control valve. Knock control system Knock control system controls the gate based on the engine rotation speed and detects knocking by the peak value of the knock sensor output during the gate open period, and then controls it to the most suitable ignition timing in proportion to the driving condition. Evapoparge control system This system leads the vapor stuck to the canister to the serge tank in order not to agitate the air fuel by adjusting the fuel injection volume. The signal at this time will be output from TEMINL EVP of the engine control module to VSV (EVP). 3. Diagnosis System ith the diagnosis system, when there is a malfunctioning in the engine control module signal system,the malfunction system is recorded in the memory. The malfunctioning system can 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 trouble being caused by continued control based on the signals from that system, the fail safe system either controls the system by using the data (Standard values) recorded in the engine control module memory or else stops the engine COOLL (ED533U)

10 Service Hints C/OPN elay 5 3 : Closed with the starter running and the engine running EFI elay 5 3 : Closed with the ignition S at ON or ST position E Engine Coolant Temp. Sensor : pprox kω ( 0 C, 4 F) pprox kω ( 0 C, 3 F) pprox..45 kω (0 C, 68 F) pprox kω (80 C, 76 F) E3 (), E4 (), E5 (C), E6 (D) Engine Control Module Voltage at engine control module wiring connectors + E : 9 4 volts (Ignition S at ON position) VC E : volts (Ignition S at ON position) VT E : volts (Ignition S on and throttle valve fully closed) : volts (Ignition S on and throttle valve fully open) EVG E : volts (Ignition S at ON position) TH E : volts (Engine idling and intake air temp C, 3 76 F) TH E : 0..0 volts (Engine idling and engine coolant temp C, F) ST E : 6 4 volts (Engine cranking) IGT, IGT, IGT3, IGT4 E : Pulse generation (Engine idling) IGF E : Pulse generation (Engine idling) FC E : 9 4 volts (Ignition S on and engine stopping) 0 3 volts (Engine idling) E : 9 4 volts (Engine idling and warning light off) /CS E : 9 4 volts (Ignition S on and /C S off) SPD E : Pulse generation (Driving approx. 0 km/h) ELS E : volts (Ignition S on and taillight on) ELS E : volts (Ignition S on and rear window defogger on) NS E : 0 3 volts (Engine cranking) #0, #0, #30, #40 E : Pulse generation (Engine idling) NE+ NE : Pulse generation (Engine idling) SO E : Pulse generation (Engine idling) G+ NE : Pulse generation (Engine idling) TP E : volts (Ignition S on) PTNK E : volts (Ignition S at ON position and remove fuel cap) OX, OX E : Pulse generation (Maintain engine speed at 500 rpm for two minutes after warming up.) HT, HT E : volts (Ignition S at ON position) volts (Engine idling) KNK E : Pulse generation (Engine idling) EVP E : volts (Ignition S at ON position) TCH E : Pulse generation (Engine idling) 004 COOLL (ED533U) 67

11 Engine Control : Parts Location Code See Page Code See Page Code See Page 3 F0 36 J H5 3 J5 35 C 3 H8 35 J6 35 C 3 I 33 J7 35 C3 3 I 33 K 33 C8 34 I3 33 M 33 C9 34 I4 33 P 33 C 34 I5 33 S 33 C4 34 I6 33 S9 35 D 34 I7 33 T 33 E 3 I8 33 V 33 E3 34 I9 33 V 33 E4 34 I0 35 V3 33 E5 C 34 J 35 V4 37 E6 D 34 J3 35 V5 37 : elay locks Code See Page elay locks (elay lock Location) Engine oom / (Engine Compartment Left) 3 8 H / (ight Side of the Instrument Panel einforcement) : Junction lock and ire Harness Connector Code See Page Junction lock and ire Harness (Connector Location) IC 5 Engine oom Main ire and Instrument Panel J/ (Lower Finish Panel) ID 5 Floor ire and Instrument Panel J/ (Lower Finish Panel) IG IH II 5 IJ Instrument Panel ire and Instrument Panel J/ (Lower Finish Panel) IK IL 4 IM Engine ire and Engine oom J/ (Engine Compartment Left) 3 3C 8 Instrument Panel ire and H J/ (ight Side of the Instrument Panel einforcement) 4 4C 30 Instrument Panel ire and Center J/ (ehind the Combination Meter) : Connector Joining ire Harness and ire Harness Code See Page Joining ire Harness and ire Harness (Connector Location) E 38 Engine ire and Engine oom Main ire (Inside of the Engine oom /) I I4 I5 40 Engine oom Main ire and Instrument Panel ire (Left Side of the Instrument Panel einforcement) I6 ID 4 Instrument Panel ire and Floor ire (Left Kick Panel) II II 4 Engine ire and Instrument Panel ire (lower Unit H) COOLL (ED533U)

12 : Ground Points Code See Page Ground Points Location E EC 38 Left Side of the Cylinder Head ED 38 Front Left Suspension Tower IE 40 ehind the Combination Meter IG 40 ight Kick Panel H 44 Under the Left Quarter Pillar : Splice Points Code See Page ire Harness with Splice Points Code See Page ire Harness with Splice Points E I7 4 Instrument Panel ire 38 Engine ire E3 I0 4 Engine ire I I 4 Instrument Panel ire I4 004 COOLL (ED533U) 69