NO.1 NO RFW OPERATION FROM FREE TO LOCK (RFW INDICATOR LIGHT DOES NOT ILLUMINATE) [WL-C, WE-C (MT)]
id0303c2801600
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1
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NO RFW OPERATION FROM FREE TO LOCK (RFW INDICATOR LIGHT DOES NOT ILLUMINATE.)
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DESCRIPTION
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RFW does not change from free to lock.
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[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
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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INSPECT MAIN FUSE.
• Is it OK?
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Yes
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Go to next step.
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No
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Replace main fuse, then go to Step 27.
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2
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INSPECT RFW INDICATOR LIGHT BULB
• Is it OK?
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Yes
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Go to next step.
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No
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Replace the RFW indicator light bulb, then go to Step 27.
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3
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MEASURE VOLTAGE BETWEEN INSTRUMENT CLUSTER CONNECTOR TERMINAL 1F AND GROUND.
• Is the voltage greater than 10 V?
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Yes
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Go to next step.
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No
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Repair wiring harness between main fuse and instrument cluster, then go to Step 27.
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4
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MEASURE VOLTAGE BETWEEN INSTRUMENT CLUSTER CONNECTOR TERMINAL 1D AND GROUND.
• Is the voltage greater than 10 V?
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Yes
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Repair wiring harness between instrument cluster and PCM, then go to Step 27.
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No
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Replace print plate in instrument cluster, then go to Step 27.
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5
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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?
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Yes
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Connect free solenoid valve, then go to next step.
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No
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Repair wiring harness between main relay and free solenoid valve connector, then go to Step 27.
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6
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MEASURE VOLTAGE BETWEEN FREE SOLENOID VALVE CONNECTOR TERMINAL B AND GROUND.
• Is the voltage greater than 10 V?
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Yes
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Go to next step.
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No
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Inspect free solenoid valve, then go to Step 27.
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7
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MEASURE VOLTAGE BETWEEN PCM CONNECTOR TERMINAL 254 AND GROUND.
• Is the voltage greater than 10 V?
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Yes
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Go to next step.
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No
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Repair wiring harness between free solenoid valve and PCM, then go to Step 27.
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8
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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?
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Yes
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Connect lock solenoid valve, then go to next step.
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No
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Repair wiring harness between main relay and lock solenoid valve connector, then go to Step 27.
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9
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MEASURE VOLTAGE BETWEEN LOCK SOLENOID VALVE CONNECTOR TERMINAL B AND GROUND.
• Is the voltage greater than 10 V?
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Yes
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Go to next step.
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No
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Repair wiring harness between PCM and ground, then go to Step 27.
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10
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MEASURE VOLTAGE BETWEEN PCM CONNECTOR TERMINAL 253 AND GROUND.
• Is the voltage greater than 10 V?
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Yes
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Go to next step.
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No
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Inspect lock solenoid valve, then go to Step 27.
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11
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INSPECT FOR CONTINUITY BETWEEN PCM CONNECTOR TERMINAL 202/204/206 AND GROUND.
• Turn engine switch OFF.
• Is there continuity?
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Yes
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Go to next step.
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No
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Repair wiring harness between PCM and ground, then go to Step 27.
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12
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INSPECT FOR CONTINUITY BETWEEN PCM CONNECTOR TERMINAL 135 AND GROUND.
• Is there continuity?
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Yes
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Go to Step 16.
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No
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Go to next step.
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13
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INSPECT FOR CONTINUITY BETWEEN TRANSFER NEUTRAL SWITCH CONNECTOR TERMINAL A AND GROUND.
• Is there continuity?
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Yes
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Repair wiring harness between PCM and transfer neutral switch, then go to Step 27.
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No
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Go to next step.
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14
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INSPECT TRANSFER NEUTRAL SWITCH.
• Is it OK?
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Yes
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Go to next step.
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No
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Replace transfer neutral switch, then go to Step 27.
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15
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INSPECT FOR CONTINUITY BETWEEN TRANSFER NEUTRAL SWITCH CONNECTOR TERMINAL B AND GROUND.
• Is there continuity?
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Yes
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Go to next step.
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No
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Repair wiring harness between transfer neutral switch and ground, then go to Step 27.
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16
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INSPECT FOR CONTINUITY BETWEEN PCM CONNECTOR TERMINAL 137 AND GROUND.
• Shift select lever to 4x4 indicator position.
• Is there continuity?
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Yes
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Go to Step 20.
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No
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Go to next step.
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17
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INSPECT FOR CONTINUITY BETWEEN 4X4 INDICATOR SWITCH CONNECTOR TERMINAL A AND GROUND.
• Is there continuity?
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Yes
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Repair wiring harness between 4x4 indicator switch and PCM, then go to Step 27.
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No
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Go to next step.
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18
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INSPECT 4X4 INDICATOR SWITCH.
• Is it OK?
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Yes
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Go to next step.
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No
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Replace 4x4 indicator switch, then go to Step 27.
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19
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INSPECT FOR CONTINUITY BETWEEN 4X4 INDICATOR SWITCH CONNECTOR TERMINAL B AND GROUND.
• Is there continuity?
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Yes
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Go to next step.
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No
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Repair wiring harness between 4x4 indicator switch and ground, then go to Step 27.
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20
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INSPECT FOR CONTINUITY BETWEEN PCM CONNECTOR TERMINAL 185 AND GROUND.
• Shift select lever to 4H position.
• Is there continuity?
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Yes
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Go to Step 24.
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No
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Go to next step.
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21
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INSPECT FOR CONTINUITY BETWEEN RFW SWITCH CONNECTOR TERMINAL A AND GROUND.
• Is there continuity?
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Yes
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Repair wiring harness between PCM and RFW switch, then go to Step 27.
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No
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Go to next step.
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22
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INSPECT RFW SWITCH.
• Is it OK?
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Yes
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Go to next step.
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No
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Replace RFW switch, then go to Step 27.
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23
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INSPECT FOR CONTINUITY BETWEEN RFW SWITCH CONNECTOR TERMINAL B AND GROUND.
• Is there continuity?
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Yes
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Go to next step.
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No
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Repair wiring harness between RFW switch and ground, then go to Step 27.
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24
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INSPECT ONE-WAY CHECK VALVE.
• Is it OK?
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Yes
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Go to next step.
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No
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Replace one-way check valve, then go to Step 27.
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25
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INSPECT RFW CONTROL BOX.
• Is it OK?
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Yes
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Go to next step.
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No
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Replace RFW control box, then go to Step 27.
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26
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INSPECT VACUUM IN VACUUM HOSES.
• Is it OK?
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Yes
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Go to next step.
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No
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Replace vacuum in vacuum hoses, then go to Step 27.
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27
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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?
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Yes
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Troubleshooting completed. Explain repairs to customer.
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No
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Inspect malfunction symptoms again, then repeat from Step 1 if malfunction occurs again.
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