ABS Warning Light Remains ON

DESCRIPTION

The skid control ECU is connected to the combination meter via CAN and multiplex communications.
If any of the following is detected, the ABS warning light remains on.

1. The skid control ECU connectors are disconnected from the skid control ECU.
   
2. There is a malfunction in the skid control ECU internal circuit.
   
3. There is an open in the harness between the combination meter and the skid control ECU.
   

HINT:

There is a case that the intelligent tester cannot be used when the skid control ECU is abnormal.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration (Click here).

1. INSPECT CAN COMMUNICATION SYSTEM

1. Check if the CAN communication system DTC is output (Click here for LHD, Click here for RHD).
   

   Result:

   Condition	Proceed To
   DTC is not output	A
   DTC is output	B

B	REPAIR CAN COMMUNICATION SYSTEM

A

2. INSPECT MULTIPLEX COMMUNICATION SYSTEM

1. Check if the multiplex communication system DTC is output (Click here).
   

   Result:

   Condition	Proceed To
   DTC is not output	A
   DTC is output	B

B	REPAIR MULTIPLEX COMMUNICATION SYSTEM

A

3. INSPECT IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

1. Check the skid control ECU connector's connecting condition.

   OK:

   The connector should be securely connected.
   

NG	CONNECT CONNECTOR TO ECU CORRECTLY

OK

4. INSPECT BATTERY

1. Check the battery voltage.

   Voltage:

   10 to 14 V
   

NG	INSPECT CHARGING SYSTEM

OK

5. INSPECT SKID CONTROL ECU (IG1 TERMINAL)

1. Turn the ignition switch on.

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

   Voltage:

   Tester Connection	Condition	Specified Condition
   S40-7 (IG1) - Body ground	Ignition switch on	10 to 14 V

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

OK

6. INSPECT SKID CONTROL ECU (GND TERMINAL)

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

   Resistance:

   Tester Connection	Specified Condition
   S41-1 (GND1) - Body ground	Below 1 Ω
   S40-2 (GND2) - Body ground	Below 1 Ω
   S40-1 (GND3) - Body ground	Below 1 Ω
   S39-2 (GND4) - Body ground	Below 1 Ω
   S39-1 (GND5) - Body ground	Below 1 Ω
   S38-4 (GND6) - Body ground	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

OK

7. INSPECT COMBINATION METER ASSEMBLY

1. Check the combination meter assembly (Click here).

   HINT:

   If troubleshooting has been carried out according to the PROBLEM SYMPTOMS TABLE, refer back to the table and proceed to the next step before replacing the part (Click here).

NG	REPLACE COMBINATION METER ASSEMBLY

OK
REPLACE SKID CONTROL ECU