No.2 MODE CHANGE BETWEEN AUTO AND 4 X 4 ON IS NOT PERFORMED NORMALLY

id030300801400

Possible Cause

• 4WD lock switch malfunction

• 4WD lock solenoid sticking

• RBC unit malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION

1
• INSPECT 4WD LOCK SYSTEM FOR POWER SUPPLY
• Turn the ignition switch off.
• Disconnect the 4WD lock switch connector.
• Turn the ignition switch to the ON position.
• Measure the voltage at terminal B of the 4WD lock switch vehicle-side connector.
• Is the voltage 10 V or more?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part.
2
INSPECT 4WD LOCK SWITCH
• Inspect the 4WD lock switch.
• Is the 4WD lock switch normal?
Yes
Go to the next step.
No
Replace the 4WD lock switch.
3
INSPECT 4WD RELAY COIL SIDE POWER SUPPLY WIRING HARNESS FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Connect the 4WD lock switch.
• Disconnect the 4WD relay connector.
• Turn the ignition switch to the ON position.
• Set the 4WD lock switch ON (LOCK).
• Measure the voltage at terminal A of the 4WD relay vehicle-side connector.
• Is the voltage 10 V or more?
Yes
Go to the next step.
No
Repair or replace the wiring harness between 4WD lock switch terminal A and 4WD relay terminal A.
4
INSPECT 4WD RELAY COIL SIDE GROUND WIRING HARNESS FOR OPEN CIRCUIT
• Turn the ignition switch to the ON position.
• Measure the resistance between terminal B of the 4WD relay vehicle-side connector and body ground.
• Is the resistance less than 5 ohms?
Yes
Go to the next step.
No
Repair or replace any malfunction.
5
INSPECT 4WD RELAY SWITCH SIDE GROUND WIRING HARNESS FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Measure the voltage between terminal D of the 4WD relay vehicle-side connector and body ground.
• Is the voltage 10 V or more?
Yes
Go to the next step.
No
Repair or replace the wiring harness between CJB terminal B and 4WD relay terminal D.
6
INSPECT 4WD RELAY
• Inspect the 4WD relay.
• Is the 4WD relay normal?
Yes
Go to the next step.
No
Replace the 4WD relay.
7
INSPECT 4WD LOCK SOLENOID POWER SUPPLY SYSTEM WIRING HARNESS FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Disconnect the 4WD lock solenoid connector.
• Measure the resistance between terminal C of the 4WD relay vehicle-side connector and terminal B of the 4WD lock solenoid vehicle-side wiring harness.
• Is the resistance less than 5 ohms?
Yes
Go to the next step.
No
Repair or replace any malfunction.
8
INSPECT 4WD LOCK SOLENOID GROUND WIRING HARNESS FOR OPEN CIRCUIT
• Measure the resistance between terminal A of the 4WD lock solenoid vehicle-side connector and ground.
• Is the resistance less than 5 ohms?
Yes
Go to the next step.
No
Repair or replace any malfunctioning.
9
INSPECT CONNECTORS FOR CONNECTION
• Turn the ignition switch off.
• Inspect the pin connection of the following connectors.
- 4WD lock switch
- 4WD relay
- 4WD lock solenoid
• Is there any poor connection or corrosion?
Yes
Repair or replace any malfunction.
No
Replace the RBC unit.