Vehicle Stability Control System (For Hydraulic Brake Booster) Vsc Off Indicator Light Remains On

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION LINE

CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID CSW CIRCUIT)

CHECK TERMINAL VOLTAGE (EXI3)

READ VALUE USING INTELLIGENT TESTER (TRC/VSC OFF MODE)

CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID - VSC OFF SWITCH)

INSPECT VSC OFF SWITCH

CHECK HARNESS AND CONNECTOR (MASTER CYLINDER SOLENOID EXI3 CIRCUIT)

CHECK TERMINAL VOLTAGE (EXI3)

INSPECT REAR DIFFERENTIAL LOCK DETECTION SWITCH (DIFFERENTIAL LOCK INDICATOR SWITCH)

CHECK TERMINAL VOLTAGE (EXI3)

DESCRIPTION

1. When the transfer is in L4, VSC is prohibited and the VSC OFF indicator and TRC OFF indicator lights turn on.
   
2. w/ Rear Differential Lock:
   When the rear differential is locked, VSC is prohibited and the VSC OFF indicator and TRC OFF indicator lights turn on. At this time, ABS is also prohibited and the ABS warning light turns on.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. When replacing the skid control ECU (master cylinder solenoid), perform calibration (LandCruiser RM00000452J00ZX.html).
   
2. As there may be malfunctions in the transfer system related to when the transfer operates in L4, check the transfer system first (LandCruiser RM0000030AI01JX.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. Select CAN Bus Check from the System Selection Menu screen and follow the prompts on the screen to inspect the CAN bus (for LHD: LandCruiser RM000000WIB0ECX.html, for RHD: LandCruiser RM000000WIB0EEX.html).
   

   OK:

   CAN Bus Check indicates no malfunctions in CAN communication.
   

   Result

   Result	Proceed to
   OK	A
   NG (for LHD)	B
   NG (for RHD)	C

1. Disconnect the A7 skid control ECU (master cylinder solenoid) connector.
   

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   A7-9 (CSW) - Body ground	VSC OFF switch not pushed in	10 kΩ or higher
   	VSC OFF switch pushed in	Below 1 Ω

1. Disconnect the A7 skid control ECU connector.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   A7-40 (EXI3) - Body ground	Ignition switch ON w/ Rear Differential Lock: Rear differential free	11 to 14 V

   Text in Illustration

   *a	Front view of wire harness connector (to Skid Control ECU)

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 / Data List.
   
   

   ABS/VSC/TRC

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   TRC/VSC Off Mode	TRC/VSC off mode/ Normal, TRC OFF or VSC OFF	Normal: Normal mode TRC OFF: TRC OFF mode VSC OFF: VSC OFF mode	-

6. Check that the mode display changes according to VSC OFF switch operation.
   

   OK:

   Display changes according to switch operation.
   

   Result

   Result	Proceed to
   OK	A
   NG (for LHD)	B
   NG (for RHD)	C

1. Disconnect the A7 skid control ECU (master cylinder solenoid) connector.
   

2. Disconnect the G9 VSC OFF switch connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   A7-9 (CSW) - G9-6	Always	Below 1 Ω
   A7-9 (CSW) - Body ground	Always	10 kΩ or higher
   G9-3 - Body ground	Always	Below 1 Ω

1. Remove the VSC OFF switch (LandCruiser RM000001WZ2051X.html).
   

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   6 - 3	Switch is not pushed	10 kΩ or higher
   	Switch is pushed	Below 1 Ω

   Text in Illustration

   *a	Component without harness connected (VSC OFF Switch)

   Result

   Result	Proceed to
   NG	A
   OK (for LHD)	B
   OK (for RHD)	C

1. Disconnect the A7 skid control ECU connector.
   

2. Disconnect the G53 four wheel drive control ECU connector.
   

3. w/ Rear Differential Lock:
   Disconnect the E2 rear differential lock detection switch connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   A7-40 (EXI3) - Body ground	Always	10 kΩ or higher

   Result

   Result	Proceed to
   OK (w/o Rear Differential Lock)	A
   OK (w/ Rear Differential Lock)	B
   NG	C

1. Disconnect the A7 skid control ECU connector.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   A7-40 (EXI3) - Body ground	Ignition switch ON w/ Rear Differential Lock: Rear differential free	11 to 14 V

   Text in Illustration

   *a	Front view of wire harness connector (to Skid Control ECU)

1. Remove the rear differential lock detection switch (LandCruiser RM000003PYI00GX.html).
   

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   1 (GND) - 2 (+B)	Pushed in	Below 1 Ω
   	Not pushed in	10 kΩ or higher

   Text in Illustration

   *a	Component without harness connected (Rear Differential Lock Detection Switch)

1. Disconnect the A7 skid control ECU connector.
   

2. Connect the G53 four wheel drive control ECU connector.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   A7-40 (EXI3) - Body ground	Ignition switch ON	11 to 14 V

   Text in Illustration

   *a	Front view of wire harness connector (to Skid Control ECU)

   Result

   Result	Proceed to
   NG	A
   OK (for LHD)	B
   OK (for RHD)	C