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 TERMINAL VOLTAGE (IG1 TERMINAL)

CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)

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

CHECK TERMINAL VOLTAGE (EXI3 TERMINAL)

CHECK HARNESS AND CONNECTOR (EXI3 TERMINAL CIRCUIT)

INSPECT REAR DIFFERENTIAL LOCK SYSTEM

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ABS WARNING LIGHT)

DESCRIPTION

1. The skid control ECU (brake actuator assembly) 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.
   
5. The rear differential is locked.*
   *: w/ Rear Differential Lock
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. After replacing the brake actuator assembly, perform calibration (Toyota Fortuner RM000000XHR06WX.html).
   
2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
   
3. Before disconnecting the connector, make sure that there are no problems with the connection.
   
4. After disconnecting the connector, make sure that the connector case and terminals are not deformed or corroded.
   

1. Check if DTCs for the ABS are output (Toyota Fortuner RM000000XHV0C7X.html).
   

   Result

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

1. Check if the skid control ECU (brake actuator assembly) connector is securely connected.
   

   OK:

   The connector is securely connected.
   

1. Turn the ignition switch off.
   

2. Disconnect the skid control ECU (brake actuator assembly) 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

   Text in Illustration

   *a	Front view of wire harness connector (to Skid Control ECU [Brake Actuator Assembly])

1. Turn the ignition switch off.
   

2. Disconnect the skid control ECU (brake actuator assembly) 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 (brake actuator assembly) connector.
   

3. Disconnect the C27 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) - C27-38 (LP)	Always	Below 1 Ω
   S25-10 (WA) - Body ground	Always	10 kΩ or higher

1. Turn the ignition switch off.
   

2. Disconnect the skid control ECU (brake actuator assembly) 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

   Text in Illustration

   *a	Front view of wire harness connector (to Skid Control ECU [Brake Actuator Assembly])

1. Turn the ignition switch off.
   

2. Disconnect the rear differential lock position switch (No. 4 transfer indicator switch) connector.
   

3. Disconnect the rear differential lock ECU (4 wheel drive control ECU) connector.
   

4. Disconnect the skid control ECU (brake actuator assembly) connector.
   

5. Disconnect the C28 combination meter connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   S25-28 (EXI3) - T29-2	Always	Below 1 Ω
   S25-28 (EXI3) - C28-9	Always	Below 1 Ω
   S25-28 (EXI3) - F18-1 (RLP)	Always	Below 1 Ω
   S25-28 (EXI3) - Body ground	Always	10 kΩ or higher

1. Inspect rear differential lock system (Toyota Fortuner RM000001ZVW001X.html).
   

1. Turn the ignition switch off.
   

2. Connect the intelligent tester to the DLC3.
   

3. Turn the ignition switch to ON.
   

4. Turn the intelligent tester on.
   

5. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.
   
   

   ABS/VSC/TRC

   Tester Display	Test Part	Control Range	Diagnostic Note
   ABS Warning Light	ABS warning light	Warning light ON / OFF	Observe the combination meter.

6. When performing the ABS Warning Light Active Test, check ABS Warning Light in the Data List.