Power Supply And Ground Circuit
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis Procedure
1. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SWITCH ON POWER SUP-
PLY (1)
1.Turn the power switch OFF.
2.Disconnect ABS actuator and electric unit (control unit) harness connector.
3.Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.
4.Turn the power switch ON
CAUTION:
Never set the vehicle to READY.
5.Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.
Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 2.
2. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SWITCH ON POWER SUP-
PLY (2)
1.Turn the power switch OFF.
2.Check the 10A fuse (#4).
3.Check the continuity and short circuit between ABS actuator and electric unit (control unit) harness connector terminal (16) and 10A fuse (#4).
Is the inspection result normal?
YES- Perform trouble diagnosis for power switch ON power supply. Refer to "Wiring Diagram ON POWER SUPPLY -" On Power Supply.
NO- Repair or replace error-detected parts.
3. CHECK MOTOR AND MOTOR RELAY POWER SUPPLY
1.Turn the power switch OFF.
2.Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.
3.Turn the power switch ON.
CAUTION:
Never set the vehicle to READY.
4.Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.
Is the inspection result normal?
YES- GO TO 5.
NO- GO TO 4.
4. CHECK MOTOR AND MOTOR RELAY POWER SUPPLY CIRCUIT
1.Turn the power switch OFF.
2.Check the 30A fusible link (#L).
3.Check the continuity and short circuit between ABS actuator and electric unit (control unit) harness connector terminal (1) and 30A fusible link (#L).
Is the inspection result normal?
YES- Perform trouble diagnosis for 12V battery power supply. Refer to "Wiring Diagram BATTERY POWER SUPPLY -" Battery Power Supply.
NO- Repair or replace error-detected parts.
5. CHECK ACTUATOR RELAY, ABS IN VALVE, ABS OUT VALVE POWER SUPPLY
1.Turn the power switch OFF.
2.Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.
3.Turn the power switch ON
CAUTION:
Never set the vehicle to READY.
4.Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.
Is the inspection result normal?
YES- GO TO 7.
NO- GO TO 6.
6. CHECK ACTUATOR RELAY, ABS IN VALVE, ABS OUT VALVE POWER SUPPLY CIRCUIT
1.Turn the power switch OFF.
2.Check the 50A fusible link (#J).
3.Check the continuity and short circuit between ABS actuator and electric unit (control unit) harness connector terminal (2) and 50A fusible link (#J).
Is the inspection result normal?
YES- Perform trouble diagnosis for 12V battery power supply. Refer to "Wiring Diagram BATTERY POWER SUPPLY -" Battery Power Supply.
NO- Repair or replace error-detected parts.
7. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND CIRCUIT
Check the continuity between ABS actuator and electric unit (control unit) harness connector and the ground.
Is the inspection result normal?
YES- GO TO 8.
NO- Repair or replace error-detected parts.
8. CHECK TERMINAL
Check the ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES- INSPECTION END
NO- Repair or replace error-detected parts.