NO.1 NO RFW OPERATION [WL-C, WE-C (AT)]

id0303c3802000

1
NO RFW OPERATION
DESCRIPTION
RFW dose not change from lock to free or from free to lock.
TROUBLESHOOTING HINTS
•  Motor component (position sensor) malfunction
•  Motor component (shift motor) malfunction
•  4x4 control module malfunction
•  4x4 switch malfunction
•  Lock solenoid valve malfunction
•  Free solenoid valve malfunction
•  RFW actuator malfunction
•  RFW control box malfunction
•  One-way check valve malfunction
•  Air leakage from vacuum hose
•  Related fuses and/or harnesses malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
MEASURE VOLTAGE BETWEEN FREE SOLENOID VALVE CONNECTOR TERMINAL A AND GROUND
•  Disconnect free solenoid valve connector.
•  Turn engine switch ON.
•  Measure voltage between free solenoid valve connector terminal A and ground.
•  Is the voltage greater than 10 V?
Yes
Connect free solenoid valve, then go to next step.
No
Repair wiring harness between main relay and free solenoid valve connector.
Then go to Step 14.
2
MEASURE VOLTAGE BETWEEN FREE SOLENOID VALVE CONNECTOR TERMINAL B AND GROUND
•  Is the voltage greater than 10 V?
Yes
Go to next step.
No
Inspect free solenoid valve.
Then go to Step 14.
3
MEASURE VOLTAGE BETWEEN 4x4 CONTROL MODULE CONNECTOR TERMINAL V AND GROUND
•  Is the voltage greater than 10 V?
Yes
Go to next step.
No
Repair wiring harness between free solenoid valve and 4x4 control module.
Then go to Step 14.
4
MEASURE VOLTAGE BETWEEN LOCK SOLENOID VALVE CONNECTOR TERMINAL A AND GROUND
•  Disconnect free solenoid valve connector.
•  Turn engine switch ON.
•  Measure voltage between free solenoid valve connector terminal A and ground.
•  Is the voltage greater than 10 V?
Yes
Connect lock solenoid valve, then go to next step.
No
Repair wiring harness between main relay and lock solenoid valve connector.
Then go to Step 14.
5
MEASURE VOLTAGE BETWEEN LOCK SOLENOID VALVE CONNECTOR TERMINAL B AND GROUND
•  Is the voltage greater than 10 V?
Yes
Go to next step.
No
Inspect lock solenoid valve.
Then go to Step 14.
6
MEASURE VOLTAGE BETWEEN 4x4 CONTROL MODULE CONNECTOR TERMINAL V AND GROUND
•  Is the voltage greater than 10 V?
Yes
Go to next step.
No
Repair wiring harness between lock solenoid valve and 4x4 control module.
Then go to Step 14.
7
INSPECT FOR CONTINUITY BETWEEN 4x4 CONTROL MODULE CONNECTOR TERMINAL W, X AND GROUND
•  Turn engine switch OFF.
•  Is there continuity?
Yes
Go to next step.
No
Repair wiring harness between 4x4 control module and ground.
Then go to Step 14.
8
MEASURE VOLTAGE BETWEEN 4x4 CONTROL MODULE CONNECTOR TERMINAL T, Y, Z AND GROUND
•  Turn engine switch ON.
•  Is the voltage greater than 10 V?
Yes
Go to next step.
No
Repair related wiring harness and related fuses.
Then go to Step 14.
9
INSPECT 4x4 SWITCH
•  Is 4x4 switch OK?
Yes
Go to next step.
No
Repair or replace 4x4 switch.
Then go to step 14.
10
INSPECT CONTINUITY FOR 4x4 SWITCH
•  Between 4x4 switch connector terminal A and 4x4 control module terminal G.
•  Between 4x4 switch connector terminal C and 4x4 control module terminal F.
•  Between 4x4 switch connector terminal F and ground.
•  Is there continuity?
Yes
Go to next step.
No
Repair wiring harness between 4x4 switch and 4x4 control module.
Then go to Step 14.
11
INSPECT ONE-WAY CHECK VALVE
•  Is one-way check valve OK?
Yes
Go to next step.
No
Replace one-way check valve.
Then go to step 14.
12
INSPECT RFW ACTUATOR
•  Is RFW actuator OK?
Yes
Go to next step.
No
Replace RFW actuator.
Then go to step 14.
13
INSPECT VACUUM HOSE
•  Is vacuum hose OK?
Yes
Go to next step.
No
Repair or Replace vacuum hose.
Then go to step 14.
14
•  Verify test results.
―  If normal, return to the diagnostic index to service any additional symptoms.
―  If malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.
•  If the vehicle is repaired, troubleshooting completed.
•  If the vehicle is not repaired or additional diagnostic information is not available, replace the 4x4 control module.