C1912

C1911, C1912 4WAS REAR MOTOR POWER SUPPLY





Description
The power supply for 4WAS rear motor.




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.RECHECK DTC
1. Turn the ignition switch from OFF to ON.

CAUTION:
Stop the vehicle. Wait 15 minutes or more.
2. Perform 4WAS main control unit self-diagnosis.
Is DTC "C1911" or "C1912" detected?
YES - Proceed to diagnosis procedure. Refer to C1911.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK 4WAS MAIN CONTROL UNIT POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect 4WAS main control unit harness connector.
3. Check the voltage between 4WAS main control unit harness connectors and the ground.





4. Turn the ignition switch ON.

CAUTION:
Never start the engine.
5. Check the voltage between 4WAS main control unit harness connectors and the ground.





Is the inspection result normal?
YES - GO TO 2.
NO - Check the following items. Repair or replace the malfunctioning parts.
- 10A fuse (#45) open
- Short among 10A fuse (#45) connector, 4WAS main control unit harness connector No. 27 terminal and the ground
- Open between the ignition switch and 4WAS main control unit harness connector No. 27 terminal
- Ignition switch
2.CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (1)
1. Turn the ignition switch OFF.
2. Remove 4WAS rear motor relay.
3. Check the continuity between 4WAS rear motor relay harness connector terminal and the ground.





4. Check the continuity between 4WAS rear motor relay harness connector terminal and 4WAS main control unit harness connector terminal.





Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace the harnesses and connectors.
3.CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (2)
Check the voltage between 4WAS rear motor relay harness connector terminal and the ground.





Is the inspection result normal?
YES - GO TO 4.
NO - Check the following items. Repair or replace the malfunctioning parts.
- 20A fuse (#37) open
- Short among 20A fuse (#37) connector, 4WAS rear motor relay harness connector No. 3 terminal and the ground
- Open between the battery and 4WAS rear motor relay harness connector No. 3 terminal
4.CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (3)
1. Remove the noise suppressor.
2. Check continuity between the noise suppressor harness connector terminal and the ground.





3. Check the continuity between the noise suppressor harness connector terminal and 4WAS rear motor relay harness connector terminal.





4. Check the continuity between the noise suppressor harness connector terminal and 4WAS main control unit harness connector terminal.





Is the inspection result normal?
YES - GO TO 5.
NO - Repair or replace the harnesses and connectors.
5.CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (4)
1. Connect 4WAS main control unit harness connector.
2. Turn the ignition switch ON.

CAUTION:
Never start the engine.
3. Check the voltage between 4WAS main control unit harness connectors and the ground.





4. Turn the ignition switch OFF.
Is the inspection result normal?
YES - GO TO 6.
NO - Replace 4WAS main control unit. Refer to Exploded View.
6.CHECK 4WAS REAR MOTOR RELAY
1. Apply 12 V to 4WAS rear motor relay connector No. 1 terminal and No. 2 terminal.

CAUTION:
- Never make the terminals short.
- Connect the fuse between the terminals when applying the voltage.
2. Check the continuity between 4WAS rear motor relay connector terminals.





3. Check the resistance between 4WAS rear motor relay connector terminals.





Is the inspection result normal?
YES - GO TO 7.
NO - Replace 4WAS rear motor relay.
7.CHECK NOISE SUPPRESSOR
Check continuity between the noise suppressor connector terminals.





Is the inspection result normal?
YES - GO TO 8.
NO - Replace the noise suppressor.
8.CHECK 4WAS REAR MOTOR POWER SUPPLY
1. Install 4WAS rear motor relay.
2. Install the noise suppressor.
3. Turn the ignition switch ON.

CAUTION:
Never start the engine.
4. Check the voltage between 4WAS main control unit harness connectors and the ground.





Is the inspection result normal?
YES - GO TO 9.
NO - Replace 4WAS main control unit. Refer to Exploded View.
9.PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
Perform 4WAS main control unit self-diagnosis.
Is DTC "C1911" or "C1912" detected?
YES - Replace 4WAS main control unit. Refer to Exploded View.
NO - GO TO 10.
10.CHECK INFORMATION
With CONSULT-III
Check the "DATA MONITOR" value of each DTC detected with the self-diagnosis function. Refer to 4WAS Main Control Unit.
Is each data the standard value?
YES - Check each harness connector pin terminal for disconnection.
NO - Replace 4WAS main control unit. Refer to Exploded View.




Component Inspection (4WAS Rear Motor Relay)
1.CHECK 4WAS REAR MOTOR RELAY
1. Turn the ignition switch OFF.
2. Remove 4WAS rear motor relay connector.
3. Apply 12 V to 4WAS rear motor relay connector No. 1 terminal and No. 2 terminal.

CAUTION:
- Never make the terminals short.
- Connect the fuse between the terminals when applying the voltage.
4. Check the continuity between 4WAS rear motor relay connector terminals.





5. Check the resistance between 4WAS rear motor relay connector terminals.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace 4WAS rear motor relay.




Component Inspection (Noise Suppressor)
1.NOISE SUPPRESSOR INSPECTION
1. Turn the ignition switch OFF.
2. Remove the noise suppressor.
3. Check continuity between the noise suppressor connector terminals.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace the noise suppressor.




Special Repair Requirement

BEFORE REPLACING 4WAS MAIN CONTROL UNIT
- Record the self-diagnosis results (history).

CAUTION:
- Never erase the memory (history) of self-diagnosis results when replacing 4WAS main control unit after diagnosis.
- Erase the memory of the self-diagnosis results (record) after printing out or recording all the values of "DATA MONITOR".