Calibration See Precheck

DIAGNOSTIC TROUBLE CODES - NON CODE - TRANSLATE ECU MALFUNCTION CIRCUIT DESCRIPTION

DTC No.

DTC Detecting Condition

Trouble Area

Non code

Translate ECU internal malfunction ts detected.

• Brake warning light circuit

• Tc terminal circuit

• Translate ECU

Fig. 103: DTC Non Code Detecting Condition Trouble Area Table Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. Check the BRAKE warning light circuit (See BRAKE WARNING LIGHT CIRCUIT ).

NG: Repair or replace the BRAKE warning light circuit. OK: Go to next step.

2. Check the TC terminal circuit (See TC TERMINAL CIRCUIT ).

NG: Repair or replace the Tc terminal circuit. OK: Check and replace translate ECU.

DIAGNOSTIC TROUBLE CODES - ALWAYS ON*1 - MALFUNCTION IN SKID CONTROL ECU

*1 ABS warning light CIRCUIT DESCRIPTION

DTC No.

DTC Detecting Condition

Trouble Area

Always ON

When any of the following is detected:

1. Malfunction in ECU internal circuit is identified.

2. ECU power source voltage is too high.

• Charging system

• Power source circuit

• ADS warning light circuit

• Skid control ECU

G02S21351

G02S21351

Fig. 104: DTC Always On Detecting Condition Trouble Area Table Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

HINT:

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

There is a case that TOYOTA hand-held tester cannot be used when ECU is abnormal. WIRING DIAGRAM

Skid Control Ecu Toyota Sequoia
Fig. 105: Wiring Diagram - Skid Control ECU Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. Is DTC output?

Check DTC PRE-CHECK .

YES: Repair circuit indicated by the output code. NO: Go to next step.

2. Check that the skid control ECU connector are securely connected to the skid control ECU.

NG: Connect the connector to the skid control ECU. OK: Go to next step.

3. Check voltage between terminals IG1 and GND of skid control ECU connector.

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

PREPARATION:

Disconnect the skid control ECU connector. CHECK:

a. Turn the ignition switch ON.

b. Measure voltage between terminal IG1 and GND of skid control ECU harness side connector.

Fig. 106: Measuring Voltage Between IG1 & GND Terminals Of Skid Control ECU Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: Check for open and short circuit in harness and connector between ECU-IG fuse and skid control ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).

OK: Go to next step.

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

4. Check battery positive voltage. CHECK:

Check the battery positive voltage. OK:

NG: Check and repair the charging system ( GENERATORS & REGULATORS ). OK: Go to next step.

5. Check the Tc terminal circuit (See TC TERMINAL CIRCUIT )

NG: Repair or replace the Tc terminal circuit. OK: Go to next step.

6. Check operation of the ABS warning light.

In the case of using the TOYOTA hand-held tester: PREPARATION:

a. Connect the TOYOTA hand-held tester to the DLC3.

b. Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON.

c. Select the ACTIVE TEST mode on the TOYOTA hand-held tester.

CHECK:

Check that "ON" and "OFF" of the ABS warning light can be shown on the combination meter by the TOYOTA hand-held tester.

In the case of not using the TOYOTA hand-held tester: PREPARATION:

a. Turn the ignition switch OFF.

b. Disconnect the connector from the skid control ECU.

c. Turn the ignition switch ON.

CHECK:

Check the ABS warning light goes off.

OK: Check and replace skid control ECU.

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

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