ABS Warning Light Remains ON

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: ABS Warning Light Remains ON
- ABS Warning Light Remains ON

DESCRIPTION

The skid control ECU is connected to the combination meter via the CAN and multiplex communication systems.

If any of the following is detected, the ABS warning light remains on:

* The skid control ECU connectors are disconnected from the skid control ECU.

* There is a malfunction in the skid control ECU internal circuit.

* There is an open in the harness between the combination meter and the skid control ECU.

* The ABS control system is defective.

HINT
In some cases, the Techstream cannot be used when the skid control ECU is abnormal.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration and store system information Programming and Relearning.

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

(a) Check if a CAN communication system DTC is output Diagnosis System.

Result:





B -- INSPECT CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

2. CHECK MULTIPLEX COMMUNICATION SYSTEM

(a) Check if a multiplex communication system DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- INSPECT MULTIPLEX COMMUNICATION SYSTEM Diagnostic Trouble Code Descriptions
A -- Continue to next step.

3. CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

(a) Check if the skid control ECU connector is securely connected.

OK:

The connector is securely connected.

NG -- CONNECT CONNECTOR TO ECU CORRECTLY
OK -- Continue to next step.

4. CHECK BATTERY

(a) Check the battery voltage.

Standard Voltage:

11 to 14 V

Result:





C -- CHECK OR REPLACE CHARGING SYSTEM OR BATTERY (for 4GR-FSE) Component Tests and General Diagnostics

B -- CHECK OR REPLACE CHARGING SYSTEM OR BATTERY (for 2GR-FSE) Component Tests and General Diagnostics
A -- Continue to next step.

5. INSPECT SKID CONTROL ECU (IG1 TERMINAL)

(a) Disconnect the skid control ECU connector.





(b) Turn the engine switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)
OK -- Continue to next step.

6. INSPECT SKID CONTROL ECU (GND1 TERMINAL)

(a) Turn the engine switch off.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)
OK -- Continue to next step.

7. INSPECT COMBINATION METER ASSEMBLY

(a) Reconnect the skid control ECU connector.

(b) Perform the Active Test of the combination meter (meter CPU) using the Techstream Scan Tool Testing and Procedures.

(c) Check the combination meter.

OK:

The ABS warning light turns on or off in accordance with the Techstream operation.

HINT
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part Problem Symptoms Table.

NG -- REPLACE COMBINATION METER ASSEMBLY Removal

OK -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal