NO.1 NO RFW OPERATION FROM FREE TO LOCK (RFW INDICATOR LIGHT DOES NOT ILLUMINATE) [WL-C, WE-C (MT)]

id0303c2801600

1
NO RFW OPERATION FROM FREE TO LOCK (RFW INDICATOR LIGHT DOES NOT ILLUMINATE.)
DESCRIPTION
RFW does not change from free to lock.
[TROUBLESHOOTING HINTS]
•  Transfer neutral switch malfunction
•  4x4 indicator switch malfunction
•  PCM malfunction
•  Lock solenoid valve malfunction
•  Free solenoid valve malfunction
•  RFW indicator light bulb malfunction
•  RFW control box malfunction
•  Main fuse and/or main relay malfunction
•  Print plate in instrument cluster malfunction
•  RFW switch malfunction
•  RFW actuator malfunction
•  Air leakage from vacuum hose
•  One-way check valve malfunction
•  Related fuses and/or harnesses malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT MAIN FUSE.
•  Is it OK?
Yes
Go to next step.
No
Replace main fuse, then go to Step 27.
2
INSPECT RFW INDICATOR LIGHT BULB
•  Is it OK?
Yes
Go to next step.
No
Replace the RFW indicator light bulb, then go to Step 27.
3
MEASURE VOLTAGE BETWEEN INSTRUMENT CLUSTER CONNECTOR TERMINAL 1F AND GROUND.
•  Is the voltage greater than 10 V?
Yes
Go to next step.
No
Repair wiring harness between main fuse and instrument cluster, then go to Step 27.
4
MEASURE VOLTAGE BETWEEN INSTRUMENT CLUSTER CONNECTOR TERMINAL 1D AND GROUND.
•  Is the voltage greater than 10 V?
Yes
Repair wiring harness between instrument cluster and PCM, then go to Step 27.
No
Replace print plate in instrument cluster, then go to Step 27.
5
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 27.
6
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 27.
7
MEASURE VOLTAGE BETWEEN PCM CONNECTOR TERMINAL 254 AND GROUND.
•  Is the voltage greater than 10 V?
Yes
Go to next step.
No
Repair wiring harness between free solenoid valve and PCM, then go to Step 27.
8
MEASURE VOLTAGE BETWEEN LOCK SOLENOID VALVE CONNECTOR TERMINAL A AND GROUND.
•  Disconnect lock solenoid valve connector.
•  Turn engine switch ON.
•  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 27.
9
MEASURE VOLTAGE BETWEEN LOCK SOLENOID VALVE CONNECTOR TERMINAL B AND GROUND.
•  Is the voltage greater than 10 V?
Yes
Go to next step.
No
Repair wiring harness between PCM and ground, then go to Step 27.
10
MEASURE VOLTAGE BETWEEN PCM CONNECTOR TERMINAL 253 AND GROUND.
•  Is the voltage greater than 10 V?
Yes
Go to next step.
No
Inspect lock solenoid valve, then go to Step 27.
11
INSPECT FOR CONTINUITY BETWEEN PCM CONNECTOR TERMINAL 202/204/206 AND GROUND.
•  Turn engine switch OFF.
•  Is there continuity?
Yes
Go to next step.
No
Repair wiring harness between PCM and ground, then go to Step 27.
12
INSPECT FOR CONTINUITY BETWEEN PCM CONNECTOR TERMINAL 135 AND GROUND.
•  Is there continuity?
Yes
Go to Step 16.
No
Go to next step.
13
INSPECT FOR CONTINUITY BETWEEN TRANSFER NEUTRAL SWITCH CONNECTOR TERMINAL A AND GROUND.
•  Is there continuity?
Yes
Repair wiring harness between PCM and transfer neutral switch, then go to Step 27.
No
Go to next step.
14
INSPECT TRANSFER NEUTRAL SWITCH.
•  Is it OK?
Yes
Go to next step.
No
Replace transfer neutral switch, then go to Step 27.
15
INSPECT FOR CONTINUITY BETWEEN TRANSFER NEUTRAL SWITCH CONNECTOR TERMINAL B AND GROUND.
•  Is there continuity?
Yes
Go to next step.
No
Repair wiring harness between transfer neutral switch and ground, then go to Step 27.
16
INSPECT FOR CONTINUITY BETWEEN PCM CONNECTOR TERMINAL 137 AND GROUND.
•  Shift select lever to 4x4 indicator position.
•  Is there continuity?
Yes
Go to Step 20.
No
Go to next step.
17
INSPECT FOR CONTINUITY BETWEEN 4X4 INDICATOR SWITCH CONNECTOR TERMINAL A AND GROUND.
•  Is there continuity?
Yes
Repair wiring harness between 4x4 indicator switch and PCM, then go to Step 27.
No
Go to next step.
18
INSPECT 4X4 INDICATOR SWITCH.
•  Is it OK?
Yes
Go to next step.
No
Replace 4x4 indicator switch, then go to Step 27.
19
INSPECT FOR CONTINUITY BETWEEN 4X4 INDICATOR SWITCH CONNECTOR TERMINAL B AND GROUND.
•  Is there continuity?
Yes
Go to next step.
No
Repair wiring harness between 4x4 indicator switch and ground, then go to Step 27.
20
INSPECT FOR CONTINUITY BETWEEN PCM CONNECTOR TERMINAL 185 AND GROUND.
•  Shift select lever to 4H position.
•  Is there continuity?
Yes
Go to Step 24.
No
Go to next step.
21
INSPECT FOR CONTINUITY BETWEEN RFW SWITCH CONNECTOR TERMINAL A AND GROUND.
•  Is there continuity?
Yes
Repair wiring harness between PCM and RFW switch, then go to Step 27.
No
Go to next step.
22
INSPECT RFW SWITCH.
•  Is it OK?
Yes
Go to next step.
No
Replace RFW switch, then go to Step 27.
23
INSPECT FOR CONTINUITY BETWEEN RFW SWITCH CONNECTOR TERMINAL B AND GROUND.
•  Is there continuity?
Yes
Go to next step.
No
Repair wiring harness between RFW switch and ground, then go to Step 27.
24
INSPECT ONE-WAY CHECK VALVE.
•  Is it OK?
Yes
Go to next step.
No
Replace one-way check valve, then go to Step 27.
25
INSPECT RFW CONTROL BOX.
•  Is it OK?
Yes
Go to next step.
No
Replace RFW control box, then go to Step 27.
26
INSPECT VACUUM IN VACUUM HOSES.
•  Is it OK?
Yes
Go to next step.
No
Replace vacuum in vacuum hoses, then go to Step 27.
27
DOES RFW OPERATE FROM FREE TO LOCK?
•  Turn engine switch ON.
•  Shift select lever from 2H to 4H position.
•  Does RFW operate from free to lock?
Yes
Troubleshooting completed. Explain repairs to customer.
No
Inspect malfunction symptoms again, then repeat from Step 1 if malfunction occurs again.