Toyota Sequoia (2005). Manual - part 300

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–995

1189

DTC

51

Malfunction in ECM Control System

CIRCUIT DESCRIPTION

The circuit is used to send TRAC & VSC control information from the skid control ECU to the ECM, and en-
gine control information from the ECM to the skid control ECU via the vehicle CAN and CAN1 communication
system.
This DTC is output when the engine control system failure signal is received from the ECM.

DTC No.

DTC Detecting Condition

Trouble Area

51

Translate ECU receives the engine control system failure

signal from ECM for 5 sec. or more.

ECM

DIDMG–01

F19196

E5 
ECM

CANL

CANH

34

33

W

L

2

J53

1

J53

2

J55

1

J55

J/C

W

R

16

T5

14

T5

ENG–

ENG+

VSC+

VSC–

7

T5

11

T5

L

W

W

L

7

IL2

6

IL2

2

6

S1 ABS & VSC Actuator
(Skid Control ECU)

Translate
ECU

IG1

1

T5

B–R

J37

J37

J/C

Sub J/B No.3

8

3C

8

3A

B–R

B–R

B–Y

W–L

I18 
Ignition SW

W

Instrument Panel J/B

4

1F

1

1L

4

1C

6

1C

ECU–IG

AM1

AM1

IG1

ALT

Battery

GND

40

T5

J43 
J/C

O

A

A

O

IG

1

2

CANH

CANL

A

A

8

5

B

F10
Fusible Link
Block

1

2

(*1)

(*1)

(*2)

(*2)

(*1) Vehicle CAN Circuit
(*2) CAN1 Circuit

(*1)

(*1)

(*2)

(*2)

DI–996

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1190

WIRING DIAGRAM

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–997

1191

INSPECTION PROCEDURE

1

Check the DTC of the VSC (See page 

DI–911

).

CHECK:
Check skid control ECU DTC.
RESULT:

DTC is not output

A

DTC (C1203 / 53) is output

B

B

Repair circuit indicated by output code
(See page 

DI–921

).

A

2

Check for open and short circuit in harness and connector between skid control
ECU and translate ECU (CAN1 circuit).

NG

Repair or replace harness or connector
(CAN1 circuit).

OK

Replace translate ECU.

DI–998

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1192

DTC

53

Malfunction in CAN1

 

Communication

CIRCUIT DESCRIPTION

The circuit is used to send TRAC&VSC control information from the skid control ECU to the ECM, and engine
control information from the ECM to the skid control ECU via the CAN communication system.
This DTC is output when communication between the translate ECU and the skid control ECU is cut off.

DTC No.

DTC Detecting Condition

Trouble Area

53

IG1 voltage is 8.5 V or more, and the condition that data

from skid control ECU cannot be received continues for 5

sec. or more.

VSC+, VSC– circuit (CAN1 communication system)

Skid control ECU

Translate ECU

DIDMH–01