10
70 ENGINE CONTROL (5VZ-FE) THE ENGINE CONTROL SYSTEM UTILIZES A MICROCOMPUTER AND MAINTAINS OVERALL CONTROL OF THE ENGINE, TRANSMISSION, ETC. AN OUTLINE OF ENGINE CONTROL IS GIVEN HERE. 1. INPUT SIGNAL (1) 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 WATER TEMP. IS INPUT IN THE FORM OF A CONTROL SIGNAL TO TERMINAL THW OF THE ENGINE CONTROL MODULE. (2) HEATED OXYGEN SENSOR SIGNAL SYSTEM THE OXYGEN DENSITY IN THE EXHAUST EMISSIONS IS DETECTED AND INPUT AS A CONTROL SIGNAL TO TERMINAL OX1 OR OX2 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 (HT1 OR HT2). (3) 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. (5) VEHICLE SPEED SIGNAL SYSTEM THE VEHICLE SPEED SENSOR, DETECTS THE VEHICLE SPEED AND INPUT TO ABS SPEED SENSOR OF THE ABS ECU, FROM ABS ECU TO TERMINAL SP1 OF THE ENGINE CONTROL MODULE. (6) 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 TERMINAL AC1 OF THE ENGINE CONTROL MODULE. (7) BATTERY SIGNAL SYSTEM VOLTAGE IS CONSTANTLY APPLIED TO TERMINAL BATT 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 TERMINAL +B 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 SW SIGNAL SYSTEM THE STOP LIGHT SW IS USED TO DETECT WHETHER OR NOT THE VEHICLE IS BRAKING AND THE INFORMATION IS INPUT AS CONTROL SIGNAL TO TERMINAL BK OF THE ENGINE CONTROL MODULE. (10) 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. (11) ENGINE KNOCK SIGNAL SYSTEM ENGINE KNOCKING IS DETECTED BY THE KNOCK SENSOR NO. 1 AND NO. 2 AND THE SIGNALS ARE INPUT TO TERMINALS KNK1 AND KNK2 OF THE ENGINE CONTROL MODULE. (12) 4WD SIGNAL SYSTEM (4WD) WHETHER OR NOT THE VEHICLE IS OPERATING IN 4WD MODE IS DETERMINED, AND A CONTROL SIGNAL IS INPUT TO TERMINAL 4WD OF THE ENGINE CONTROL MODULE. (13) 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. SYSTEM OUTLINE

ENGINE CONTROL (5VZ-FE) - MR2 Diagrams/5VZ-FE/4Runner/1996... · engine control (5vz-fe) the engine control system utilizes a microcomputer and maintains overall control of the engine,

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Page 1: ENGINE CONTROL (5VZ-FE) - MR2 Diagrams/5VZ-FE/4Runner/1996... · engine control (5vz-fe) the engine control system utilizes a microcomputer and maintains overall control of the engine,

70

ENGINE CONTROL (5VZ-FE)

THE ENGINE CONTROL SYSTEM UTILIZES A MICROCOMPUTER AND MAINTAINS OVERALL CONTROL OF THE ENGINE,TRANSMISSION, ETC. AN OUTLINE OF ENGINE CONTROL IS GIVEN HERE.

1. INPUT SIGNAL

(1) ENGINE COOLANT TEMP. SIGNAL SYSTEM

THE ENGINE COOLANT TEMP. SENSOR DETECTS THE ENGINE COOLANT TEMP. AND HAS A BUILT-IN THERMISTOR WITH ARESISTANCE WHICH VARIES ACCORDING TO THE WATER TEMP. THUS THE WATER TEMP. IS INPUT IN THE FORM OF ACONTROL SIGNAL TO TERMINAL THW OF THE ENGINE CONTROL MODULE.

(2) HEATED OXYGEN SENSOR SIGNAL SYSTEM

THE OXYGEN DENSITY IN THE EXHAUST EMISSIONS IS DETECTED AND INPUT AS A CONTROL SIGNAL TO TERMINAL OX1 OROX2 OF THE ENGINE CONTROL MODULE. TO MAINTAIN STABLE DETECTION PERFORMANCE BY THE HEATED OXYGENSENSOR, A HEATER IS USED FOR WARMING THE SENSOR. THE HEATER IS ALSO CONTROLLED BY THE ENGINE CONTROLMODULE (HT1 OR HT2).

(3) RPM SIGNAL SYSTEM

CAMSHAFT POSITION AND CRANKSHAFT POSITION ARE DETECTED BY THE CAMSHAFT POSITION SENSOR AND CRANKSHAFTPOSITION SENSOR. CAMSHAFT POSITION IS INPUT AS A CONTROL SIGNAL TO TERMINAL G OF THE ENGINE CONTROLMODULE, 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 CONTROLSIGNAL TO TERMINAL VTA OF THE ENGINE CONTROL MODULE.

(5) VEHICLE SPEED SIGNAL SYSTEM

THE VEHICLE SPEED SENSOR, DETECTS THE VEHICLE SPEED AND INPUT TO ABS SPEED SENSOR OF THE ABS ECU, FROMABS ECU TO TERMINAL SP1 OF THE ENGINE CONTROL MODULE.

(6) 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 TOTERMINAL AC1 OF THE ENGINE CONTROL MODULE.

(7) BATTERY SIGNAL SYSTEM

VOLTAGE IS CONSTANTLY APPLIED TO TERMINAL BATT OF THE ENGINE CONTROL MODULE. WHEN THE IGNITION SW ISTURNED TO ON, VOLTAGE FOR ENGINE CONTROL MODULE OPERATION IS APPLIED VIA THE EFI RELAY TO TERMINAL +B OFTHE 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 THEENGINE CONTROL MODULE AS A CONTROL SIGNAL.

(9) 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 ASCONTROL SIGNAL TO TERMINAL BK OF THE ENGINE CONTROL MODULE.

(10) STARTER SIGNAL SYSTEM

TO CONFIRM THAT THE ENGINE IS CRANKING, THE VOLTAGE APPLIED TO THE STARTER MOTOR DURING CRANKING ISDETECTED AND IS INPUT AS A CONTROL SIGNAL TO TERMINAL STA OF THE ENGINE CONTROL MODULE.

(11) ENGINE KNOCK SIGNAL SYSTEM

ENGINE KNOCKING IS DETECTED BY THE KNOCK SENSOR NO. 1 AND NO. 2 AND THE SIGNALS ARE INPUT TO TERMINALSKNK1 AND KNK2 OF THE ENGINE CONTROL MODULE.

(12) 4WD SIGNAL SYSTEM (4WD)

WHETHER OR NOT THE VEHICLE IS OPERATING IN 4WD MODE IS DETERMINED, AND A CONTROL SIGNAL IS INPUT TOTERMINAL 4WD OF THE ENGINE CONTROL MODULE.

(13) 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 ISINPUT AS A CONTROL SIGNAL INTO TERMINAL THA OF THE ENGINE CONTROL MODULE.

SYSTEM OUTLINE

Page 2: ENGINE CONTROL (5VZ-FE) - MR2 Diagrams/5VZ-FE/4Runner/1996... · engine control (5vz-fe) the engine control system utilizes a microcomputer and maintains overall control of the engine,

71

2. CONTROL SYSTEM

* SFI SYSTEM

THE SFI SYSTEM MONITORS THE ENGINE CONDITIONS THROUGH THE SIGNALS EACH SENSOR (INPUT SIGNALS (1 TO 13))INPUTS TO THE ENGLNE CONTROL MODULE. BASED ON THIS DATA AND THE PROGRAM MEMORIZED IN THE ENGINE CONTROLMODULE, THE MOST APPROPRIATE FUEL INJECTION TIMING IS DECIDED AND CURRENT IS OUTPUT TO TERMINALS #10, #20, #30,#40, #50 AND #60 OF THE ENGINE CONTROL MODULE, CAUSING THE INJECTORS TO OPERATE (TO INJECT FUEL). IT IS THISSYSTEM WHICH, THROUGH THE WORK OF THE ENGINE CONTROL MODULE, FINELY CONTROLS FUEL INJECTION IN RESPONSETO DRIVING CONDITIONS.

* ELECTRONIC SPARK ADVANCE SYSTEM

THE ELECTRONIC SPARK ADVANCE SYSTEM MONITORS THE ENGINE CONDITIONS USING THE SIGNALS (INPUT SIGNALS (1, 3, 4TO 6, 8, 10, 11)) INPUT TO THE ENGINE CONTROL MODULE FROM EACH SENSOR. BASED ON THIS DATA AND THE PROGRAMMEMORIZED IN THE ENGINE CONTROL MODULE, THE MOST APPROPRIATE IGNITION TIMING IS DECIDED AND CURRENT ISOUTPUT TO TERMINALS IGT1, IGT2 AND IGT3 OF THE ENGINE CONTROL MODULE. THIS OUTPUT CONTROLS THE IGNITER TOPRODUCE THE MOST APPROPRIATE IGNITION TIMING FOR THE DRIVING CONDITONS.

* 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 DETECTIONPERFORMANCE OF THE SENSOR. THE ENGINE CONTROL MODULE EVALUATES THE SIGNALS FROM EACH SENSOR (INPUTSIGNALS (1, 3, 7, 8, 10)). CURRENT IS OUTPUT TO TERMINAL HT1 OR HT2 AND CONTROLS THE HEATER.

3. DIAGNOSIS SYSTEMWITH THE DIAGNOSIS SYSTEM, WHEN THERE IS A MALFUNCTION IN THE ECU SIGNAL SYSTEM, THE MALFUNCTIONING SYSTEM ISRECORDED IN THE MEMORY. THE MALFUNCTIONING SYSTEM CAN THEN BE FOUND BY READING THE DISPLAY (CODE) OF THEMALFUNCTION INDICATOR LAMP.

4. FAIL-SAFE SYSTEMWHEN A MALFUNCTION OCCURS IN ANY SYSTEM, IF THERE IS A POSSIBILITY OF ENGINE TROUBLE BEING CAUSED BYCONTINUED CONTROL BASED ON THE SIGNALS FROM THAT SYSTEM, THE FAIL-SAFE SYSTEM EITHER CONTROLS THE SYSTEMBY USING DATA (STANDARD VALUES) RECORDED IN THE ENGINE CONTROL MODULE MEMORY OR ELSE STOPS THE ENGINE.

SYSTEM OUTLINE

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72

ENGINE CONTROL (5VZ-FE)

7

1 0 AS T O P

O M P O W E R S O U R C E S Y S T E M (S E E P A G E 58 )

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73

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74

ENGINE CONTROL (5VZ-FE)

FR O M P O W E R S O U R C E S Y S TE M (S EE P A G E 58)

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75

7 . 5 AO B D

F R O M P O W E R S O U R C E S Y S T E M (S E E P A G E 5 8 )

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76

ENGINE CONTROL (5VZ-FE)

EFI RELAY(2) 5- (2) 3 : CLOSED WITH IGNITION SW AT ON OR ST POSITION

C 6 CIRCUIT OPENING RELAY5-3 : CLOSED WITH STARTER RUNNING OR IGNITION SW AT ON POSITION

I 6, I 7, I 8, I 9, I10, I11 INJECTOR1-2 : 13.4-14.2 Ω

T 2 THROTTLE POSITION SENSOR1-2 : 5-5 KΩ

E 3 ENGINE COOLANT TEMP. SENSOR1-2 : 10-20 KΩ (-20 C, 4F)

4-7 KΩ (-0 C, 32F)2-3 KΩ (-20 C, 68F)0.9-1.3 KΩ (-40 C, 104F)0.4-0.7 KΩ (-60 C, 140F)0.2-0.4 KΩ (-80 C, 176F)

E 5 (A), E 6 (B), E 7 (C), E 8 (D), E 9 (E), E10 (F), E11 (G), E12 (H) ENGINE CONTROL MODULEVOLTAGE AT ENGINE CONTROL MODULE WIRING CONNECTORS+B -E1 : 9-14 VOLTS (IGNITION WIRING CONNECTORSBATT -E1 : 9-14 VOLTS (ALWAYS)VCC -E2 : 4.4-5.5 VOLTS (IGNITION SW ON)VTA -E2 : APPROX. 0.6 VOLTS (IGNITION SW ON AND THROTTLE VALVE FULLY CLOSED)

APPROX. 4 VOLTS (IGNITION SW ON AND THROTTLE VALVE FULLY OPEN)IGT1, IGT2, IGT3-E1 : PULSE GENERATION (CRANKING OR IDLING)STA -E1 : 6 VOLTS OR MORE (IGNITION SW AT ST POSITION)#10, #20, #30, #40, #50, #60-E1 : 9-14 VOLTS (IGNITION SW ON)W -E1 : 9-14 VOLTS (NO TROUBLE AND ENGINE RUNNING)THW -E1 : 0.2-1.0 VOLTS (IGNITION SW ON AND COOLANT TEMP. 80C, 176F)SP1 -E1 : PULSE GENERATION WITH VEHICLE MOVINGBK -E1 : 7.5-14 VOLTS (STOP LIGHT SW ON)

RESISTANCE AT ECU WIRING CONNECTOR(DISCONNECT WIRING CONNECTOR)THW -E2 : 0.2-0.4 KΩ (COOLANT TEMP. 80C, 176F)NE -E2 : 140-180 Ω

SERVICE HINTS

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: PARTS LOCATION

CODE SEE PAGE CODE SEE PAGE CODE SEE PAGE

C 1 26 (5VZ-FE) F10 32 J 1 A 27 (5VZ-FE)

C 2 26 (5VZ-FE) H 3 27 (5VZ-FE) J 2 B 27 (5VZ-FE)

C 6 30 H 4 29 (5VZ-FE) J 4 31

C11 30 I 1 27 (5VZ-FE) J 9 31

D 1 26 (5VZ-FE) I 2 27 (5VZ-FE) J12 32

D 7 30 I 3 27 (5VZ-FE) K 2 27 (5VZ-FE)

E 3 26 (5VZ-FE) I 4 27 (5VZ-FE) K 3 27 (5VZ-FE)

E 5 A 31 I 5 27 (5VZ-FE) M 1 27 (5VZ-FE)

E 6 B 31 I 6 27 (5VZ-FE) S 4 31

E 7 C 31 I 7 27 (5VZ-FE) T 2 27 (5VZ-FE)

E 8 D 31 I 8 27 (5VZ-FE) V 1 27 (5VZ-FE)

E 9 E 31 I 9 27 (5VZ-FE) V 7 27 (5VZ-FE)

E10 F 31 I10 27 (5VZ-FE) V 8 27 (5VZ-FE)

E11 G 31 I11 27 (5VZ-FE)

E12 H 31 I14 31

: RELAY BLOCKS

CODE SEE PAGE RELAY BLOCKS (RELAY BLOCK LOCATION)

220 (USA)

ENGINE ROOM R/B (ENGINE COMPARTMENT LEFT)221 (CANADA)

ENGINE ROOM R/B (ENGINE COMPARTMENT LEFT)

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

CODE SEE PAGE JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)

1F 22 COIL WIRE AND DRIVER SIDE J/B (LOWER FINISH PANEL)

1H22 ENGINE ROOM MAIN WIRE AND DRIVER SIDE J/B (LOWER FINISH PANEL)

1J22 ENGINE ROOM MAIN WIRE AND DRIVER SIDE J/B (LOWER FINISH PANEL)

3A

3C24 COWL WIRE AND CENTER J/B (NEAR THE STEERING COLUMN TUBE)

3D24 COWL WIRE AND CENTER J/B (NEAR THE STEERING COLUMN TUBE)

3E

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

CODE SEE PAGE JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)

EB1 36 (5VZ-FE) KNOCK SENSOR WIRE AND ENGINE WIRE (FRONT SIDE OF CYLINDER HEAD COVER RIGHT)

EC1 36 (5VZ-FE) ENGINE WIRE AND WATER TEMP. SENSOR WIRE (FRONT SIDE OF CYLINDER HEAD COVER RIGHT)

IE2 40 COWL WIRE AND FLOOR NO.2 WIRE (LEFT KICK PANEL)

IG1 40 ENGINE ROOM MAIN WIRE AND COWL WIRE (LEFT KICK PANEL)

II140 ENGINE WIRE AND COWL WIRE (ON THE GLOVE BOX)

II340 ENGINE WIRE AND COWL WIRE (ON THE GLOVE BOX)

: GROUND POINTS

CODE SEE PAGE GROUND POINTS LOCATION

EB 36 (5VZ-FE) FRONT LEFT FENDER

EC 36 (5VZ-FE) INTAKE MANIFOLD LEFT

IE 40 COWL SIDE PANEL LH

IF 40 COWL SIDE PANEL RH

: SPLICE POINTS

CODE SEE PAGE WIRE HARNESS WITH SPLICE POINTS CODE SEE PAGE WIRE HARNESS WITH SPLICE POINTS

E 136 (5VZ FE) ENGINE WIRE

I 540 COWL WIRE

E 236 (5VZ-FE) ENGINE WIRE

I1040 COWL WIRE

I 2 40 COWL WIRE I11 40 ENGINE WIRE

I 3 40 ENGINE ROOM MAIN WIRE

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ENGINE CONTROL (5VZ-FE)

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