1996 Tacoma (L4 VIN:M)

Transcription

1 1996 Tacoma (L4 VIN:M) 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. Report a problem with this article 3. 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 THWOF THE ENGINE CONTROL MODULE. (2) 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 TOTERMINAL THAOF 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 TERMINAL OX1OR OX2OF 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 (HT1OR HT2). (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 TERMINAL G OF THE ENGINE CONTROL MODULE, AND ENGINE RPM IS INPUT TOTERMINAL NE. (5) THROTTLE SIGNAL SYSTEM THE THROTTLE POSITION SENSOR DETECTS THE THROTTLE VALVE OPENING ANGLE, WHICH IS INPUT AS A CONTROL SIGNAL TO TERMINAL VTAOF THE ENGINE CONTROL MODULE, OR WHEN THE VALVE IS FULLY CLOSED, TO TERMINAL IDL. (6) VEHICLE SPEED SIGNAL SYSTEM THE VEHICLE SPEED SENSOR, INSTALLED INSIDE THE COMBINATION METER, DETECTS THE VEHICLE SPEED AND INPUTS A CONTROL SIGNAL TO TERMINAL SP1OF THE ENGINE CONTROL MODULE. (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 TERMINAL AC1 OF THE ENGINE CONTROL MODULE. (8) BATTERY SIGNAL SYSTEM VOLTAGE IS CONSTANTLY APPLIED TO TERMINAL BATTOF 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 +BOF 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 ENGINE CONTROL MODULE AS A CONTROL SIGNAL. (10) STOP LIGHT SW SIGNAL SYSTEM TERMINAL VGOF THE 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 TERMINAL BKOF THE ENGINE CONTROL MODULE. (11) STA 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 TOTERMINAL STAOF THE ENGINE CONTROL MODULE. (12) ENGINE KNOCK SIGNAL SYSTEM ENGINE KNOCKING IS DETECTED BY THE KNOCK SENSOR 1 AND 2 AND THE SIGNALS ARE INPUT TO TERMINALS KNK1 AND KNK2OF THE ENGINE CONTROL MODULE. (13) 4WD SIGNAL SYSTEM WHETHER OR NOT THE VEHICLE IS OPERATING IN 4WD MODE IS DETERMINED, AND A CONTROL SIGNAL IS INPUT TO TERMINAL 4WDOF THE ENGINE CONTROL MODULE. 1/10

2 4. CONTROL SYSTEM * SFI SYSTEM THE SFI SYSTEM MONITORS THE ENGINE CONDITIONS THROUGH THE SIGNALS EACH SENSOR (INPUT SIGNALS (1 TO 13)) INPUTS TO THE ENGINE CONTROL MODULE. BASED ON THIS DATA AND THE PROGRAM MEMORIZED IN THE ENGINE CONTROL MODULE, THE MOST APPROPRIATE FUEL INJECTION TIMING IS DECIDED AND CURRENT IS OUTPUT TOTERMINALS #10, #20, #30, #40, #50AND #60OF 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 (ELECTRONIC SPARK ADVANCE) SYSTEM THE ESA SYSTEM MONITORS THE ENGINE CONDITIONS USING THE SIGNALS (INPUT SIGNALS (1, 4, 5 TO 7, 9, 11, 12)) INPUT TO THE ENGINE CONTROL MODULE FROM EACH SENSOR. BASED ON THIS DATA AND THE PROGRAM MEMORIZED IN THE ENGINE CONTROL MODULE, THE MOST APPROPRIATE IGNITION TIMING IS DECIDED AND CURRENT IS OUTPUT TO TERMINALS IGT1, IGT2AND IGT3 OF THE ENGINE CONTROL MODULE. THIS OUTPUT CONTROLS THE IGNITER TO PRODUCE THE MOST APPROPRIATE IGNITION TIMING FOR THE DRIVING CONDITIONS. * FUEL PRESSURE CONTROL SYSTEM THE FUEL PRESSURE UP SYSTEM CAUSES THE VSV (FPU) TO COME ON FOR HIGH TEMP. STARTS AND FOR ABOUT 180 SECONDS AFTER STARTING IN ORDER TO INCREASE THE FUEL PRESSURE, IMPROVE STARTABILITY AT HIGH TEMPERATURES AND PROVIDE STABLE IDLING. THE ENGINE CONTROL MODULE EVALUATES THE INPUT SIGNALS FROM EACH SENSOR (1, 2, 4 AND 11), OUTPUTS CURRENT TOTERMINAL FPUAND CONTROLS THE VSV. * 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 FROM EACH SENSOR (INPUT SIGNALS (1, 4, 8, 9, 11)), CURRENT IS OUTPUT TOTERMINAL HT1 OR HT2AND CONTROLS THE HEATER. * EGR CUT CONTROL SYSTEM THE EGR CUT CONTROL SYSTEM CONTROLS THE VSV (EGR) BY EVALUATING THE SIGNALS FROM EACH SENSOR INPUT TO THE ENGINE CONTROL MODULE (INPUT SIGNALS (1, 9)) AND BY SENDING OUTPUT TO TERMINAL EGROF THE ENGINE CONTROL MODULE. 5. DIAGNOSIS 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. 6. FAIL-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. 2/10

3 17 IF1 B 7 AM2 IG2 6 FROM POWER SOURCE SYSTEM (SEE PAGE 50) ST ACC 2 AM1 IG1 7. 5A 15A 10A 15A IGN EFI OBD STOP I14IGNITION SW ST F G Y I 1 E EFIRELAY B Y W IF1 STARTER RELAY E B W IF A STA 1 2 BATT CG SDL SG I E 12 3E E 13 3E 25 IF1 9 BN1 7 3F 6 3F 6 IK2 22 IK M E 3 3E 9 3F F 7 FUEL PUMP 16 IK2 BATTERY 2 3E 4 3E B W (A/T) B 6 BN1 J 1JUNCTION CONNECTOR B 5 IK2 26 IK2 G Y B W (A/T) B W (M/T) B W (M/T) TO BULB CHECK RELAY [COMB. METER] EA ID ID EB EB 3/10

4 8 IK2 B G Y 2 20 IF1 G Y 26 IF C B Y 15IF1 15 IK C 18 A 14 A 25 A 14 D 10 D 8 D 6 D 9 D 7 D 5 D (A/T) 19 E 2 E 20 E 12 H 25 H 9 H 11 H 10 H 8 H (M/T) SDL BK NSW # 10 #30 #50 # 20 #40 # 60 E 5 A, E, E 6 B, F, E 7 C, G, E 8 D, H ENGINE CONTROL MODULE TPC EVP1 +B FC STA E3 VG THA E2 THG THW 13 B 15 B 22 A 4 B 13 D 18 C 8 C 14 C 22 C 21 C 20 C (A/T) 3 H 5 H 12 E 14 H 11 E 8 G 2 G 12 G 9 G 14 G 4 G (M/T) W G (* 6) 2 EE1 26 IK IF EE1 BR B BR B BR B G Y B W (A/T) B W (M/T) 4/10

5 FROM POWER SOURCE SYSTEM (SEE PAGE 50) BR 10AGAUGE E10 5 1B D 1 ED1 3 ED1 2 ED1 19 3D C10 A E 4 MALFUNCTION INDICATOR LAMP [COMB. METER] 5 6 V 2 A A IK2 (A/T) V (M/T) V (A/T) 3 B 17 C 16 C 20 A 5 A (A/T) 4 E 6 G 3 G 7 E 6 E (M/T) W KNK1 KNK2 AC1 ACT E 5 A, E, E 6 B, F, E 7 C, G, E 8 D, H ENGINE CONTROL MODULE IDL VTA VCC PTNK SP1 RSO RSC ACV FPU EGR TE1 32 D 7 C 1 C 15 C 12 A 23 D 22 D 10 B 9 B 8 B 5 B (A/T) 11 G 10 G 1 G 4 F 8 E 7 H 6 H 2 H 19 H 18 H 7 G (M/T) 7 3E E B 2 I 1 8 V 8 1 IDLE AIR TE1 VAPOR CONTROL VALVE PRESSURE 4 T 1 SENSOR THROTTLE +B E1 POSITION SENSOR A BR B BR B 10 3D (* 6) 12 3D BR ID 5/10

6 BR BR *3 : W/ CRUISE CONTROL *4 : W/O CRUISE CONTROL *5 : EXCEPT FLOOR A/T *6 : 4WD C 2 C 1 CRANKSHAFT CAMSHAFT POSITION SENSOR POSITION SENSOR C 5 C 11 C 10 C 24 D 25 D 26 D 12 D (A/T) 6 F 12 F 5 F 11 F 23 H 22 H 21 H 17 H (M/T) NE NE G G IGT1 IGT2 IGT3 IGF E 5 A, E, E 6 B, F, E 7 C, G, E 8 D, H ENGINE CONTROL MODULE TFN 4WD L4 OX1 HT1 OX2 HT2 E1 E01 E02 E03 17 A 26 A 29 D 13 C 16 D 19 C 15 D 16 B 34 D 33 D 1 D (A/T) 9 E 5 G 3 F 13 G 9 F 24 H 13 H 26 H 7 F (M/T) TO DETECTION SW (SHIELDED) (SHIELDED) BR BR BR BR EB EB 6/10

7 SERVICE HINTS EFI RELAY (2) 5 - (2) 3 : CLOSED WITH IGNITION SW AT ONOR STPOSITION C 6CIRCUIT OPENING RELAY 1-2 : CLOSED WITH STARTER RUNNING I 6, I 7, I 8, I 9,, I11INJECTOR 1-2 : Ω T 1THROTTLE POSITION SENSOR 3-1 : K Ω WITH CLEARANCE BETWEEN LEVER AND STOP SCREW0 MM (0IN.) 2-1 : 2.3 K Ω OR LESS WITH CLEARANCE BETWEEN LEVER AND STOP SCREW 0.50MM ( IN.) INFINITY WITH CLEARANCE BETWEEN LEVER AND STOP SCREW0.77MM ( IN.) 3-1 : K Ω WITH THROTTLE VALVE FULLY OPEN 4-1 : 4-9 K Ω E 3ENGINE COOLANT TEMP. SENSOR 1-2 : K Ω (-20 C, -4 F) 4-7 K Ω (0 C,32 F) 2-3 K Ω ( 20 C,68 F) K Ω ( 40 C, 104 F) K Ω ( 60 C, 140 F) K Ω ( 80 C, 176 F) E 5 (A), (E), E 6 (B), (F), E 7 (C), (G), E 8 (D), (H) ENGINE CONTROL MODULE VOLTAGE AT ENGINE CONTROL MODULE WIRING CONNECTORS +B -E1 : 9-14 VOLTS (IGNITION SW ON) BATT -E1 : 9-14 VOLTS (ALWAYS) VCC -E2 : VOLTS (IGNITION SW ON) IDL -E2 : 9-14 VOLTS (IGNITION SW ON AND THROTTLE VALVE OPEN) VTA -E2 : VOLTS (IGNITION SW ON AND THROTTLE VALVE FULLY CLOSED) VOLTS (IGNITION SW ON AND THROTTLE VALVE FULLY OPEN) IGT1, IGT2, IGT3-E1 : PULSE GENERATION (CRANKING OR IDLING) STA -E1 : 6VOLTS OR MORE (IGNITION SW AT STPOSITION) #10, #20, #30, #40, #50, #60-E1 :9-14 VOLTS (IGNITION SW ON) W -E1 : 9-14 VOLTS (NO TROUBLE AND ENGINE RUNNING) THA -E2 : VOLTS (IGNITION SW ON AND INTAKE AIR TEMP. 20 C, 68 F) THW -E2 : VOLTS (IGNITION SW ON AND COOLANT TEMP. 80 C, 176 F) SP1 -E1 : PULSE GENERATION WITH VEHICLE MOVING BK -E1 : VOLTS (STOP LIGHT SW ON) RESISTANCE AT ECU WIRING CONNECTOR (DISCONNECT WIRING CONNECTOR) IDL -E2 : INFINITY (THROTTLE VALVE OPEN) Ω ( THROTTLE VALVE FULLY CLOSED) VTA -E2 : K Ω (THROTTLE VALVE FULLY OPEN) K Ω (THROTTLE VALVE FULLY CLOSED) THA -E2 : 2-3 K Ω (INTAKE AIR TEMP. 20 C, 68 F) THW -E2 : K Ω (COOLANT TEMP. 80 C, 178 F) +B -E2 : K Ω NE -E1 : Ω 7/10

8 : PARTS LOCATION CODE SEE PAGE CODE SEE PAGE CODE SEE PAGE C 1 24 D 29 I11 25 C 2 24 E 8 H 29 I14 29 C 6 28 F 7 30 J 1 25 C10 A 28 H 3 24 K 2 25 C12 B 28 H 4 24 K 3 25 E 5 E 6 E 7 D 1 24 I 1 25 M 1 25 D 7 28 I 2 25 S 5 29 E 1 24 I 3 25 T 1 25 E 3 24 I 4 25 V 2 25 A 29 I 5 25 V 3 25 E 29 I 6 25 V 4 25 B 29 I 7 25 V 5 25 F 29 I 8 25 V 8 25 C 29 I 9 25 V 9 25 G : RELAY BLOCKS CODE SEE PAGE RELAY BLOCKS (RELAY BLOCK LOCATION) 2 19 R/B NO. 2 (ENGINE COMPARTMENT LEFT) : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR CODE SEE PAGE JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION) 1B 20 COWL WIRE AND J/B NO. 1 (LEFT KICK PANEL) 1F 20 ENGINE ROOM MAIN WIRE AND J/B NO. 1 (LEFT KICK PANEL) 3C 3D 3E 3F 22 COWL WIRE AND J/B NO. 3 (BEHIND THE INNSTRRUMMENTT PANEL CENTER) : CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS CODE SEE PAGE JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION) ED1 32 (5VZ-FE) SENSOR WIRE AND ENGINE WIRE (OVER THE CYLINDER HEAD) EE1 32 (5VZ-FE) ENGINE WIRE AND SENSOR WIRE (OVER THE CYLINDER HEAD) IF1 36 ENGINE ROOM MAIN WIRE AND COWL WIRE (LEFT KICK PANEL) IK1 IK2 36 ENGINE WIRE AND COWL WIRE (RIGHT KICK PPANEL) BN1 38 FRAME WIRE AND COWL WIRE (UNDER THE DRIVER S SEAT) : GROUND POINTS CODE SEE PAGE GROUND POINTS LOCATION EA 32 (5VZ-FE) FRONT LEFT FENDER EB 32 (5VZ-FE) UNDER THE DATA LINK CONNECTOR 1 ID 36 LEFT KICK PANEL : SPLICE POINTS CODE SEE PAGE WIRE HARNESS WITH SPLICE POINTS CODE SEE PAGE WIRE HARNESS WITH SPLICE POINTS E 2 I 1 36 ENGINE ROOM MAIN WIRE E 3 32 (5VZ-FE) ENGINE ROOM MAIN WIRE I 9 36 COWL WIRE E 4 32 (5VZ-FE) ENGINE WIRE 36 ENGINE WIRE E10 32 (5VZ-FE) SENSOR WIRE 8/10

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10 Portions of materials contained herein have been reprinted under license from Toyota Motor Sales, U.S.A., Inc., License Agreement TMS1004. Please see for important disclosures regarding these materials. 10/10