ENGINE CONTROL (3VZ–E) - JustAnswer

ENGINE CONTROL (3VZ?E)

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.

1. INPUT SIGNAL (1) ENGINE COOLANT TEMP. (WATER TEMP.) SIGNAL SYSTEM THE ENGINE COOLANT TEMP. SENSOR (EFI WATER TEMP. SENSOR) DETECTS THE ENGINE COOLANT TEMP. AND HAS A BUILT?IN THERMISTOR WITH A RESISTANCE WHICH VARIES ACCORDING TO THE ENGINE COOLANT TEMP. (WATER TEMP.) THUS THE ENGINE COOLANT TEMP. (WATER TEMP.) IS INPUT IN THE FORM OF A CONTROL SIGNAL TO TERMINAL THW OF THE ENGINE CONTROL MODULE (ECU).

(2) INTAKE AIR TEMP. SIGNAL SYSTEM THE INTAKE AIR TEMP. SENSOR IS INSTALLED INSIDE THE VOLUME AIR FLOW (AIR FLOW METER) AND DETECTS THE INTAKE AlR TEMP., WHICH IS INPUT AS A CONTROL SIGNAL TO TERMINAL THA OF THE ENGINE CONTROL MODULE (ECU).

(3) OXYGEN SENSOR SIGNAL SYSTEM THE OXYGEN DENSITY IN THE EXHAUST EMISSIONS IS DETECTED AND INPUT AS A CONTROL SIGNAL TO TERMINALS OX1 AND OX2 OF THE ENGINE CONTROL MODULE (ECU). TO MAINTAIN STABLE DETECTION PERFORMANCE BY THE OXYGEN SENSOR, A HEATER IS USED FOR WARNING THE SENSOR. THE HEATER IS ALSO CONTROLLED BY THE ENGINE CONTROL MODULE (ECU) (HT1, HT2).

(4) RPM SIGNAL SYSTEM CRANKSHAFT POSITION AND ENGINE RPM ARE DETECTED BY THE PICK?UP COIL INSTALLED INSIDE THE DISTRIBUTOR. CRANKSHAFT POSITION IS INPUT AS A CONTROL SIGNAL TO TERMINALS G1 AND G2 OF THE ENGINE CONTROL MODULE (ECU), AND RPM IS INPUT TO TERMINAL NE.

(5) 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 (ECU), OR WHEN THE VALVE IS FULLY CLOSED, TO TERMINAL IDL.

(6) VEHICLE SPEED SIGNAL SYSTEM THE VEHICLE SPEED SENSOR (SPEED SENSOR), INSTALLED INSIDE THE COMBINATION METER, DETECTS THE VEHICLE SPEED AND INPUTS A CONTROL SIGNAL TO TERMINAL SPD OF THE ENGINE CONTROL MODULE (ECU).

(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 A/C OF THE ENGINE CONTROL MODULE (ECU).

(8) BATTERY SIGNAL SYSTEM VOLTAGE IS CONSTANTLY APPLIED TO TERMINAL BATT OF THE ENGINE CONTROL MODULE (ECU). WHEN THE IGNITION SW IS TURNED TO ON, VOLTAGE FOR ENGINE CONTROL MODULE (ECU) OPERATION IS APPLIED VIA THE EFI MAIN RELAY TO TERMINAL +B OF THE ENGINE CONTROL MODULE (ECU).

(9) INTAKE AIR VOLUME SIGNAL SYSTEM INTAKE AIR VOLUME IS DETECTED BY THE POTENTIOMETER INSTALLED INSIDE THE VOLUME AIR FLOW (AIR FLOW METER) AND IS INPUT AS A CONTROL SIGNAL TO TERMINAL VS OF THE ENGINE CONTROL MODULE (ECU). INSIDE THE VOLUME AIR FLOW (AIR FLOW METER) THERE IS ALSO A SW FOR FUEL PUMP OPERATION, AND WHEN THE MEASURING PLATE OPENS (AIR INTAKE OCCURS), THIS SW TURNS ON AND CURRENT FLOWS TO THE FUEL PUMP TO OPERATE IT.

(10) 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 TERMINAL STP OF THE ENGINE CONTROL MODULE (ECU).

(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 TO TERMINAL STA OF THE ENGINE CONTROL MODULE (ECU).

(12) ENGINE KNOCK SIGNAL SYSTEM ENGINE KNOCKING IS DETECTED BY THE KNOCK SENSOR AND INPUT AS A CONTROL SIGNAL TO TERMINAL KNK OF THE ENGINE CONTROL MODULE (ECU).

(13) 4WD SIGNAL SYSTEM WHETHER OR NOT THE VEHICLE IS OPERATING IN 4WD MODE IS DETERMINED, AND A CONTROL IS INPUT TO TERMINAL 4WD OF THE ENGINE CONTROL MODULE (ECU).

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2. CONTROL SYSTEM * MFI (MULTIPORT FUEL INJECTION) (EFI) SYSTEM

THE MFI (EFI) SYSTEM MONITORS THE ENGINE CONDITIONS THROUGH THE SIGNALS EACH SENSOR (INPUT SIGNALS (1) TO (11), (13)) INPUTS TO THE ENGINE CONTROL MODULE (ECU). BASED ON THIS DATA AND THE PROGRAM MEMORIZED IN THE ENGINE CONTROL MODULE (ECU), THE MOST APPROPRIATE FUEL INJECTION TIMING IS DECIDED AND CURRENT IS OUTPUT TO TERMINAL #10 AND #20 OF THE ENGINE CONTROL MODULE (ECU). CAUSING THE INJECTORS TO OPERATE (TO INJECT FUEL). IT IS THIS SYSTEM WHICH, THROUGH THE WORK OF THE ENGINE CONTROL MODULE (ECU), 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 (ECU) FROM EACH SENSOR. BASED ON THIS DATA AND THE PROGRAM MEMORIZED IN THE ENGINE CONTROL MODULE (ECU), THE MOST APPROPRIATE IGNITION TIMING IS DECIDED AND CURRENT IS OUTPUT TO TERMINAL IGT OF THE ENGINE CONTROL MODULE (ECU). THIS OUTPUT CONTROLS THE IGNITER TO PRODUCE THE MOST APPROPRIATE IGNITION TIMING FOR THE DRIVING CONDITIONS. * FUEL PRESSURE?UP SYSTEM THE FUEL PRESSURE UP SYSTEM CAUSES THE VSV (FOR FUEL PRESSURE UP, A/C IDLE?UP) 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 (ECU) EVALUATES THE INPUT SIGNALS FROM EACH SENSOR (1?1, 1?2, 2, 4 AND 11)), OUTPUT CURRENT TO TERMINAL FPU AND CONTROLS THE VSV. (HOWEVER, WHEN THE ENGINE COOLANT TEMP. (WATER TEMP.) IS 95_ C, 203_ F MORE AND THE INTAKE AIR TEMP. IS 55_ C, 131_ F FOR MORE, THE VSV (FOR FPU) INCREASES THE FUEL PRESSURE FOR 90 SECOND.) * OXYGEN SENSOR HEATER CONTROL SYSTEM THE 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 (OXYGEN SENSOR) TO IMPROVE DETECTION PERFORMANCE OF THE SENSOR. THE ENGINE CONTROL MODULE (ECU) EVALUATES THE SIGNALS FROM EACH SENSOR (INPUT SIGNALS (1, 4, 8, 9, 11)), CURRENT IS OUTPUT TO TERMINALS HT1 AND HT2 AND CONTROLS THE HEATER. * PAIR CONTROL SYSTEM THE PAIR CONTROL SYSTEM TURNS ON THE VSV (FOR PAIR) WHEN THE ENGINE IS COLD AND DURING DECELERATION, PREVENTING OVERHEATING OF THE TWC (THREE?WAY CATALYTIC CONVERTER) AND REDUCING HC AND CO EMISSIONS. THE ENGINE CONTROL MODULE (ECU) EVALUATES THE SIGNALS FROM EACH SENSOR (INPUT SIGNALS (1, 4, 5, 6, 7, 9, 11)), THEN SENDS OUTPUT TO TERMINAL AS AND CONTROLS THE VSV. * EGR CUT CONTROL SYSTEM THE EGR CUT CONTROL SYSTEM CONTROLS THE VSV (FOR EGR) BY EVALUATING THE SIGNALS FROM EACH SENSOR INPUT TO THE ENGINE CONTROL MODULE (ECU) (INPUT SIGNALS (1, 9)) AND BY SENDING OUTPUT TO TERMINAL EGR OF THE ENGINE CONTROL MODULE (ECU). 3. DIAGNOSIS SYSTEM WITH THE DIAGNOSIS SYSTEM, WHEN THERE IS A MALFUNCTION IN THE ENGINE CONTROL MODULE (ECU) SIGNAL SYSTEM, THE MALFUNCTIONING STSTEM IS RECORDED IN THE MEMORY. THE MALFUNCTIONING SYSTEM CAN THEN BE FOUND BY READING THE DISPLAY (CODE) OF THE MALFUNCTION INDICATOR LAMP (CHECK ENGINE WARNING LIGHT). 4. FAI?SAFE SYSTEM WHEN A MALFUNCTION OCCURS IN ANY SYSTEM, IF THERE IS A POSSIBILITY OF ENGING 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 (ECU) MEMORY OR ELSE STOPS THE ENGINE.

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60

IE

EB

W?B

I 6 : USA I 9 : CANADA

8 BL1 W?B

G?Y

W W?R

W?R W?B

E17

E17

E17

E17

W

W?R

2

W?R

1

2

B?R

I8 NO. 1

W?R

1

2

B?R

I10 NO. 3

W?R

1

2

B?R

I12 NO. 5

W

1

2

B?R

I9 NO. 2

W

1

2

B?R

I11 NO. 4

W

1

2

B?R

I13 NO. 6

E18

E18

E18

E18

E18

B?R

B?R

B?R

B?R

B?Y (A/T)

INJECTOR

B?Y(A/T)

B?R

E18

14 IH1

N 5

B?R

B?R

P1 PARK/NEUTRAL POSITION SW (NEUTRAL START SW)

B?R

P

2

4 EB2

22 IH1

6

2

B

B?W

B?W

(A/T)

B?W (M/T)

I15 : A/T E 4 : M/T

B?W (M/T)

W?B

22 IH1

B?W (M/T)

I12 : USA I14 : CANADA

3

15 IH1 I15

B?Y (A/T)

L

L

B?Y (A/T)

L

B?R (A/T)

2

W?R

W?R

W?R

2

2 B?W (M/T)

STARTER RELAY

5

1

5

1

2

(* 6)

IB3

(* 5) B?Y

12

2

B?R B?R

B W

5 EB2

B

6

7

6

I15 IGNITION SW

IG2

ST1

ALT

80A

2

2

B?Y

EB2

B?Y

6

17 1C B?Y

IGN

7. 5A

B?Y(A/T) B?W(M/T)

1 F6 FUEL PUMP M

2

2

EFI MAIN RELAY

3 2

3 EB2

146 I11 3 BL1

W?B

3

I12 : USA I13 : CANADA

B?G

W?R 16 IH1 I15

G?Y

23 IH1

15A EFI 7 2

1 EB2 10 IH1

1A BATT STA +B 11 A 12 A

W?R

W?R L W

W?R

I15 : A/T E 4 : M/T

B?Y (A/T) B?W (M/T)

C7 CIRCUIT OPENING RELAY

W?R

B?Y(A/T) B?W(M/T)

I12 : USA I14 : CANADA

W?R

W?R

TO A/C IDLE?UP VSV

E 6 A , E 7 B , E8 C

ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU (A/T), ENGINE ECU (M/T))

B?G

B?G

TO COLD START INJECTOR, START

INJECTOR TIME SW

W?R

B?G

ENGINE CONTROL (3VZ?E)

B?R

* 1 : MALFUNCTION INDICATOR LAMP (CHECK ENGINE) * 2 : VEHICLE SPEED SENSOR (SPEED SENSOR)

* 3 : W/ CRUISE CONTROL * 4 : W/O CRUISE CONTROL

* 5 : REAR WHEEL ABS * 6 : 4 WHEEL ABS

B?R

15A STOP

TO INDICATOR SW (FOR TRANSFER)

B?R

BR

10A GAUGE

B?O

G?W

G?W

G?W

G?R

1 1C

2 S7 STOP LIGHT SW

1

5 IH1

G

FROM COLD START INJECTOR

FROM START INJECTOR TIME SW

G?W A5

SHORT PIN (W/O ADD)

C11 B , C 1 2 A , C1 4 C COMBNATION METER

P?G (A/T) G?W (M/T) I15

(W/ ADD)

9

9 B?O

B?O

I9

I16

INTEGRATION RELAY

8C

4B

12 C

(W/ ADD)

(* 2)

(* 1)

4WD

P?G (A/T) (W/O ADD)

G?W (M/T) (W/O ADD)

1

2

1

12 B

9C

6A

G?L

V

A5

ADD INDICATOR SW

3 IH1 20 IH1

V

2

G?Y (W/ ADD)

10

G?R

V

IH2

I15

G?Y (W/O ADD)

G?L

V

6A STP

9C STJ

8A 4WD

E 6 A , E7 B , E8 C

ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU (A/T), ENGINE ECU (M/T))

5A W

9A SPD

E2

IDL VTA

9 B 12 B 11 B

THG THW 13 B 4 B

VC 1B

VS 2B

THA 3B

# 20 25 C

# 10 12 C

AS 23 C

FPU 8C

EGR 22 C

W

Y?B

Y?R

G?B

G?L

2

2

W?R G?R

G P

TEMP. SENSOR)

SENSOR (EFI WATER

ENGINE COOLANT TEMP.

Y E1 EGR GAS TEMP. SENSOR

G?W

Y?W

BR?B

I15

I15 : M/T E23 : A/T

BR?B

1

1

BR?B

BR?B

G?B

BR?B

BR?B

1

E2

T1 THROTTLE POSITION SENSOR

2

3

4

IDL VTA VCC

W?R L W

W?R

6

L

IH1

V3 VOLUME AIR FLOW (AIR FLOW METER)

G?B

E4

I15

4

6

5

7

VC

VS

E2 THA

FC

E1

2

1

G?Y

W

W?R W?R

W?R W?R W?R

V6 VSV(FOR PAIR)

V8 VSV(FOR FPU) V7 VSV(FOR EGR)

1

1

1

2

2

2

I15 W?R

I15

W?R L

BR

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ENGINE CONTROL (3VZ?E)

B?R BR

A11 A/C AMPLIFIER

(SHIELDED)

9

7

1

Y?B

B?W

W?R

8 IG1 2 IG1 1 IG1

E27 1

1 ED1 2 ED1

BR

K1 KNOCK SENSOR

B

BR

L?B

B?W

B?R

(SHIELDED) B

L?B

B?W

E27 6 IH2 15 IH2 7 IH1

I15 V

B?R

BR

W R G B (SHIELDED) B?Y B?L

BR

2

TO TACHOMETER [COMB. METER]

B

B?R E24

1

I2 IGNITION COIL

B I15

B?W

B?R

B

3

5

4

D3 DISTRIBUTOR

NE

G1

G?

G2

1

2

4

3

I1 IGNITER

1

2

24 C

10 A

19 A

5B

1 C 2 C 14 C 15 C

ACV

A/C

ACT

KNK

NE

G1

G?

G2

E6 A ,E7 B ,E8 C

ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU (A/T), ENGINE ECU (M/T))

T

DG VF

TE2

OX2

HT2

OX1

HT1 SEL2

15 B 20 A 8 B 16 B

10 B

22 A

6B

10 C 17 A

3C IGF

21 C IGT

SEL1 E01 E02

E1

18 A 13 C 26 C 11 C

BR BR BR BR

BR

P?G

W R?G

B

BR

Y?W (A/T) Y?G V?G B B W

V?W

(SHIELDED) I15

I15

(SHIELDED)

I15 BR

I15

P?G

B

(SHIELDED)

R?G

(SHIELDED)

W

HEATED OXYGEN SENSOR

H10 HEATED OXYGEN SENSOR (OXYGEN SENSOR) SUB

6

17 9

T

DG VF

7 18 4 11 TE2 IG? OX OX2

3

1

OXR

HT1

+B

FP

W E1

B

E1

W?R L V BR BR

D1

8

1

23

DATA LINK

CONNECTOR 1 (CHECK CONNECTOR)

W?R

2

4

BR

W?R I15

W?R I15

L

BR

I15

I15

H3

(OXYGEN SENSOR) MAIN

W?R

3

1

OXL1

HT1

B

E1

2

4

BR

BR I15

BR I15

BR

V

BR

BR

BR (4WD M/T)

BR (2WD A/T)

BR

BR

BR

BR

BR

BR

E25

I15

I15

BR

BR

EC

IE

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