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DTC C1203/53: ECM COMMUNICATION CIRCUIT MALFUNCTION CIRCUIT DESCRIPTION

This circuit is used to send TRAC & VSC control information from the skid control ECU to the ECM (TRC+, TRC-) and engine control information from the ECM to the skid control ECU (ENG+, ENG-).

DTC No

DTC Detecting Condition

Trouble Area

C1203/53

Data cannot be transmitted andfor received to/from ECM for a fixed time.

• Brake fluid level

• Brake fluid level warning s-vilc'i circuit

• SSI orSSZcirraiit

• Transtate ECU

G029217S9

G029217S9

Fig. 42: DTC Detecting Condition Trouble Area Table Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

WIRING DIAGRAM

WIRING DIAGRAM

C1203 Toyota Sequoia
Fig. 43: Wiring Diagram ECM Communication Circuit Malfunction

2004 BRAKES ABS With EBD & BA & TRAC & VSC System - Diagnostics - Sequoia

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. INSPECTION PROCEDURE

1. Is DTC output for ECM?

Check DTC PRE-CHECK .

YES: Repair engine control system according to the output code. NO: Go to next step.

2. Check for open and short circuit in harness and connector between ECM, translate ECU and skid control ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).

NG: Repair or replace harness or connector.

OK: Go to next step.

3. Check for open circuit in harness and connector between terminal GND of ECM, translate ECU and skid control ECU and body ground (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).

NG: Repair or replace harness or connector. Tighten the ground bolt.

OK: Go to next step.

4. Check brake fluid level.

CHECK:

Check the amount of brake fluid in the reservoir.

NG: Check for fluid leakage, repair brake line and add fluid. OK: Go to next step.

5. Check brake fluid level warning switch (See INSPECTION ).

NG: Replace brake fluid level warning switch. OK: Go to next step.

6. Check for open and short circuit in harness and connector between brake fluid level warning switch and translate ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).

NG: Repair or replace harness or connector.

OK: Troubleshoot according to the DTC chart of translate ECU.

DTC C1223/43: ABS CONTROL SYSTEM MALFUNCTION CIRCUIT DESCRIPTION

DIAGNOSTIC TROUBLE CODES DETECTING CONDITION TRO1

UBLE AREA

IDTC No.

DTC Detecting Condition

Trouble Area

|C1223 / 43_|_ABS control system is abnormal._|_ABS control systemj

INSPECTION PROCEDURE

*1 Repair ABS control system according to the / code output. *2

Check for ECU connected to malfunction indicator light.

*1: Output NG code

*2: Malfunction indicator light remains ON DTC C1231/35, C1235/35: STEERING ANGLE SENSOR CIRCUIT CIRCUIT DESCRIPTION

DTC No

DTC Detecting Condition

Trouble Area

C1231/31

Data Is not transmitted to Hie steering angle sensor for a fixed time (invalid SAS data.

•Steering angle sensor

C123E/ 36

When the ECU IG1 terminal voltage is 9.5 V or more, data transmission from the steering angle sensor is impossible for 1 sec. or more.

• Steering angle sensor communication circuit to translate ECU

• Skid control ECU

G02921791

G02921791

Fig. 44: DTC Detecting Condition Trouble Area Table Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

WIRING DIAGRAM

2004 BRAKES ABS With EBD & BA & TRAC & VSC System - Diagnostics - Sequoia

N49 Steering Angle Sensor
Fig. 45: Wiring Diagram Steering Angle Sensor Circuit Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

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