Vehicle Stability Control System Abs Warning Light Remains On

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU IG1 TERMINAL)

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU GND1 TERMINAL)

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - COMBINATION METER)

INSPECT TRANSFER INDICATOR SWITCH NO.4 (REAR DIFFERENTIAL LOCK POSITION SWITCH)

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU EXI3 TERMINAL)

READ VALUE USING INTELLIGENT TESTER (ABS WARNING LIGHT)

DESCRIPTION

1. The skid control ECU connector is 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.
   
4. The anti-lock brake system is defective.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. When replacing the brake actuator assembly, perform zero point calibration (Toyota Fortuner RM000000XHR02TX.html).
   
2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
   

1. Check if DTCs for the ABS are recorded (Toyota Fortuner RM000000XHV03YX.html).
   

   Result

   Result	Proceed to
   DTC not output	A
   DTC output	B

1. Check if the skid control ECU connector is securely connected.
   

   OK:

   The connector is securely connected.
   

1. Turn the ignition switch off.
   

2. Disconnect the skid control ECU connector.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   S25-34 (IG1) - Body ground	Ignition switch ON	11 to 14 V

1. Turn the ignition switch off.
   

2. Disconnect the skid control ECU connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   S25-1 (GND1) - Body ground	Always	Below 1 Ω

1. Turn the ignition switch off.
   

2. Disconnect the skid control ECU connector.
   

3. Disconnect the combination meter connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   S25-10 (WA) - C10-38	Always	Below 1 Ω
   S25-10 (WA) - Body ground	Always	10 kΩ or higher

1. Remove the rear differential lock position switch.
   

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   1 - 2	Pushed in	Below 1 Ω
   	Released	10 kΩ or higher

1. Turn the ignition switch off.
   

2. Disconnect the skid control ECU connector.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   S25-28 (EXI3) - Body ground	Ignition switch ON	11 to 14 V

1. Turn the ignition switch off.
   

2. Connect the intelligent tester to the DLC3.
   

3. Turn the ignition switch to ON and the tester on.
   

4. Select the Data List mode on the intelligent tester (Toyota Fortuner RM000000XHW03RX.html).
   
   

   ABS/VSC/TRC

   Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
   ABS Warning Light	ABS warning light / ON or OFF	ON: ABS warning light ON OFF: ABS warning light OFF	-

5. Perform the Active Test of the skid control ECU using the intelligent tester (Toyota Fortuner RM000000XHW03RX.html).