NOTE There is a case that Toyota handheld tester cannot be used when ECU is abnormal

WIRING DIAGRAM

2001 BRAKES ABS With EBD & Trac & VSC System - Diagnostics - Sequoia

Engine Schematic Diagram
Fig. 99: DTC Always On Malfunction In Skid Control ECU Wiring Diagram

INSPECTION PROCEDURE

1. Is DTC output?

Check DTC on 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.

PREPARATION:

Disconnect the skid control ECU connector.

2001 BRAKES ABS With EBD & Trac & VSC System - Diagnostics - Sequoia

CHECK:

a. Turn the ignition switch ON.

b. Measure voltage between terminals IG1 (44) and GND (15, 46) of skid control ECU harness side connector.

Circuit Ecu Airbag
Fig. 100: Checking Voltage Between Terminals IG1 & GND Of Skid Control ECU Connector

Voltage: 10-14 V

NG: Check for open and short circuit in harness and connector between ECU-IG FUSE AND SKID CONTROL ECU .

OK: GO TO NEXT STEP

4. Check battery positive voltage.

CHECK:

Check the battery positive voltage. OK:

2001 BRAKES ABS With EBD & Trac & VSC System - Diagnostics - Sequoia

Voltage: 10-14 V

NG: Check and repair the charging system (See GENERATOR ). 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 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 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. NG: GO TO NEXT STEP

7. Check ABS warning light.

See BRAKE WARNING LIGHT .

NG: Repair or replace bulb or combination meter.

OK: Check for short circuit in harness and connector between ABS WARNING LIGHT AND SKID CONTROL ECU .

2001 BRAKES ABS With EBD & Trac & VSC System - Diagnostics - Sequoia

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

Get My Free Ebook


Responses

  • chris mercer
    How to open ecu connector?
    6 years ago
  • JONAS BURGER
    Which hand held tester used for toyota?
    6 years ago
  • selene
    How do check for voltage going to ecu of toyota sequoia?
    1 year ago

Post a comment