Anti-Lock Brake System - Abs Warning Light Remains On

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK THAT SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

CHECK DTC

CHECK CAN COMMUNICATION LINE

READ VALUE USING GTS (IG1 VOLTAGE VALUE)

CHECK HARNESS AND CONNECTOR (P TERMINAL)

PERFORM ACTIVE TEST USING GTS (ABS WARNING LIGHT)

CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL)

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU P CIRCUIT)

CHECK HARNESS AND CONNECTOR (P TERMINAL)

INSPECT REAR DIFFERENTIAL LOCK DETECTION SWITCH (NO. 1 TRANSFER INDICATOR SWITCH)

CHECK HARNESS AND CONNECTOR (P TERMINAL)

ANTI-LOCK BRAKE SYSTEM - ABS Warning Light Remains ON

DESCRIPTION

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


The skid control ECU (master cylinder solenoid) connector is disconnected from the skid control ECU (master cylinder solenoid).
There is a malfunction in the skid control ECU (master cylinder solenoid) internal circuit.
There is an open in the harness between the combination meter and skid control ECU (master cylinder solenoid).
The anti-lock brake system is defective.
The voltage at terminal IG1 is high.
The rear differential is locked.*
*: w/ Rear Differential Lock
  • HINT:
  • It may not be possible to use the GTS when the skid control ECU (master cylinder solenoid) is abnormal.

WIRING DIAGRAM

Anti-Lock Brake System - Abs Warning Light Remains On. BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

  • NOTICE:
  • After replacing the master cylinder solenoid, perform calibration ().
1.CHECK THAT SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

Check the skid control ECU (master cylinder solenoid) connector connection.

  • OK:
  • The 2 connectors are securely connected.
NG
CONNECT CONNECTOR TO ECU CORRECTLY
OK
2.CHECK DTC

Check for DTCs ().

Result
ResultProceed to
DTC is not outputA
DTC is outputB
B
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS ()
A
3.CHECK CAN COMMUNICATION LINE

Turn the ignition switch off.

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

Select CAN Bus Check from the System Selection Menu screen and follow the prompts on the screen to inspect the CAN bus.

  • OK:
  • CAN Bus Check indicates no malfunctions in CAN communication.
Result
ResultProceed to
OKA
NG (for LHD)B
NG (for RHD)C
B
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) ()
C
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) ()
A
4.READ VALUE USING GTS (IG1 VOLTAGE VALUE)

Turn the ignition switch off.

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

Start the engine.

Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

ABS/VSC/TRC
Tester DisplayMeasurement Item/Range Normal Condition Diagnostic Note
IG1 Voltage ValueIG1 voltage value/ Min.: 0.00 V, Max.: 20.00 VIgnition switch ON: 11 to 14 V -

Check the voltage output from the skid control ECU (master cylinder solenoid) displayed on the GTS.

  • OK:
  • The output voltage displayed on the GTS is within 11 to 14 V.
NG
Go to step 7
OK
5.CHECK HARNESS AND CONNECTOR (P TERMINAL)

Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

Anti-Lock Brake System - Abs Warning Light Remains On. BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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

  • Standard Voltage:
  • Tester ConnectionSwitch ConditionSpecified Condition
    A24-14 (P) - Body groundIgnition switch ON
    w/ Rear Differential Lock: Rear differential free    		11 to 14 V
Text in Illustration
*aFront view of wire harness connector
(to Skid Control ECU [Master Cylinder Solenoid])
NG
Go to step 9
OK
6.PERFORM ACTIVE TEST USING GTS (ABS WARNING LIGHT)

Turn the ignition switch off.

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

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

ABS/VSC/TRC
Tester DisplayTest PartControl RangeDiagnostic Note
ABS Warning LightABS warning lightWarning light ON/OFFObserve the combination meter.

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

ABS/VSC/TRC
Tester DisplayMeasurement Item/RangeNormal ConditionDiagnostic Note
ABS Warning LightABS warning light/ ON or OFFON: Warning light on
OFF: Warning light off		-
Result
ResultProceed to
Data List DisplayData List Display when Performing Active Test ON/OFF Operation
ONChanges between ON and OFFA
Does not change between ON and OFF (for LHD)B
Does not change between ON and OFF (for RHD)C
OFFChanges between ON and OFFA
Does not change between ON and OFF (for LHD)B
Does not change between ON and OFF (for RHD)C
B
REPLACE MASTER CYLINDER SOLENOID ()
C
REPLACE MASTER CYLINDER SOLENOID ()
A
GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) ()
7.CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

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

Anti-Lock Brake System - Abs Warning Light Remains On. BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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

  • Standard Voltage:
  • Tester ConnectionSwitch ConditionSpecified Condition
    A24-46 (IG1) - Body groundIgnition switch ON11 to 14 V
Text in Illustration
*aFront view of wire harness connector
(to Skid Control ECU (Master Cylinder Solenoid))
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
8.CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL)

Turn the ignition switch off.

Anti-Lock Brake System - Abs Warning Light Remains On. BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the A24 and A25 skid control ECU (master cylinder solenoid) connectors.

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    A24-1 (GND1) - Body groundAlwaysBelow 1 Ω
    A24-32 (GND2) - Body groundAlwaysBelow 1 Ω
    A25-4 (GND3) - Body groundAlwaysBelow 1 Ω
Text in Illustration
*aFront view of wire harness connector
(to Skid Control ECU [Master Cylinder Solenoid])
Result
ResultProceed to
NGA
OK (for LHD)B
OK (for RHD)C
B
REPLACE MASTER CYLINDER SOLENOID ()
C
REPLACE MASTER CYLINDER SOLENOID ()
A
REPAIR OR REPLACE HARNESS OR CONNECTOR
9.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU P CIRCUIT)

Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

Disconnect the A27 4 wheel drive control ECU connector.

w/ Rear Differential Lock:


Disconnect the f2 rear differential lock detection switch (No. 1 transfer indicator switch) connector.

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    A24-14 (P) - Body groundAlways10 kΩ or higher
Result
ResultProceed to
OK (w/o Rear Differential Lock)A
OK (w/ Rear Differential Lock)B
NGC
B
Go to step 11
C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A
10.CHECK HARNESS AND CONNECTOR (P TERMINAL)

Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

Connect the A27 4 wheel drive control ECU connector.

Anti-Lock Brake System - Abs Warning Light Remains On. BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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

  • Standard Voltage:
  • Tester ConnectionSwitch ConditionSpecified Condition
    A24-14 (P) - Body groundIgnition switch ON11 to 14 V
Text in Illustration
*aFront view of wire harness connector
(to Skid Control ECU [Master Cylinder Solenoid])
Result
ResultProceed to
NGA
OK (for LHD)B
OK (for RHD)C
B
REPLACE MASTER CYLINDER SOLENOID ()
C
REPLACE MASTER CYLINDER SOLENOID ()
A
REPLACE 4 WHEEL DRIVE CONTROL ECU ()
11.INSPECT REAR DIFFERENTIAL LOCK DETECTION SWITCH (NO. 1 TRANSFER INDICATOR SWITCH)

Remove the rear differential lock detection switch (No. 1 transfer indicator switch) ().

Inspect the rear differential lock detection switch (No. 1 transfer indicator switch) ().

NG
REPLACE NO. 1 TRANSFER INDICATOR SWITCH ()
OK
12.CHECK HARNESS AND CONNECTOR (P TERMINAL)

Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

Connect the A27 4 wheel drive control ECU connector.

Anti-Lock Brake System - Abs Warning Light Remains On. BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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

  • Standard Voltage:
  • Tester ConnectionSwitch ConditionSpecified Condition
    A24-14 (P) - Body groundIgnition switch ON11 to 14 V
Text in Illustration
*aFront view of wire harness connector
(to Skid Control ECU [Master Cylinder Solenoid])
Result
ResultProceed to
NGA
OK (for LHD)B
OK (for RHD)C
B
REPLACE MASTER CYLINDER SOLENOID ()
C
REPLACE MASTER CYLINDER SOLENOID ()
A
REPLACE 4 WHEEL DRIVE CONTROL ECU ()