NO.1 NO RFW OPERATION FROM FREE TO LOCK (RFW INDICATOR LIGHT DOES NOT ILLUMINATE) [G6, WLT-1, WLT-2]
id030303801600
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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
• RFW control module malfunction
• Lock solenoid valve malfunction
• Free solenoid valve malfunction
• RFW indicator light bulb malfunction
• RFW control box malfunction
• METER*1 fuse and/or ENGINE*2 fuse malfunction
• Print plate in instrument cluster malfunction
• RFW switch malfunction
• RFW actuator malfunction
• Air leakage from vacuum hose malfunction
• 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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Disconnect RFW control module connector.
Turn ignition switch or engine switch on.
Measure voltage between RFW control module connector terminal F and ground.
Is the voltage greater than 10 V?
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Yes
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Go to Step 6
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No
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Turn ignition switch or engine switch off.
Then go to next step.
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2
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Is the METER*1, ENGINE*2 fuse OK?
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Yes
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Go to next step.
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No
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Replace METER*1, ENGINE*2 fuse.
Then go to Step 30.
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3
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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 RFW indicator light bulb.
Then go to Step 30.
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4
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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 METER*1, ENGINE*2 fuse and instrument cluster.
Then go to Step 30.
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5
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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 RFW control module.
Then go to Step 30
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No
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Repair wiring harness between main relay and free solenoid valve connector, then go to Step 30.
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6
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Measure voltage between RFW control module connector terminal H and ground.
Is the voltage greater than 10 V?
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Yes
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Go to Step 7.
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No
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Turn ignition switch or engine switch off.
Then go to next step.
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7
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Disconnect free solenoid valve connector.
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 METER*1, ENGINE*2 fuse and RFW control module.
Then go to Step 30.
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8
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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 30.
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9
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Measure voltage between RFW control module connector terminal C 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 RFW control module.
Then go to Step 30.
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10
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Disconnect lock solenoid valve connector.
Measure voltage between lock solenoid valve connector terminal A and ground.
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 METER*1, ENGINE*2 fuse and RFW control module.
Then go to Step 30.
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11
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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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Inspect lock solenoid valve.
Then go to Step 30.
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12
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Measure voltage between RFW control module connector terminal A 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 lock solenoid valve and RFW control module.
Then go to Step 30.
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13
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Turn ignition switch or engine switch off.
Is there continuity between RFW control module connector terminal B and ground?
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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 control module and ground.
Then go to Step 30.
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14
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Shift select lever to N position.
Is there continuity between RFW control module connector terminal L and ground?
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Yes
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Go to Step 18.
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No
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Go to next step.
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15
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Is there continuity between transfer neutral switch connector terminal A and ground?
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Yes
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Repair wiring harness between RFW control module and transfer neutral switch.
Then go to Step 30.
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No
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Go to next step.
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16
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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 30.
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17
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Is there continuity between transfer neutral switch connector terminal B and ground?
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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 30.
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18
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Shift select lever to 4x4 indicator position.
Is there continuity between RFW control module connector terminal K and ground?
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Yes
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Go to Step 22.
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No
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Go to next step.
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19
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Is there continuity between 4x4 indicator switch connector terminal A and ground?
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Yes
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Repair wiring harness between 4x4 indicator switch and RFW control module.
Then go to Step 30.
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No
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Go to next step.
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20
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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 30.
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21
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Is there continuity between 4x4 indicator switch connector terminal B and ground?
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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 30.
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22
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Shift select lever to 4H position.
Is there continuity between RFW control module connector terminal J and ground?
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Yes
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Go to Step 26.
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No
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Go to next step.
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23
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Is there continuity between RFW switch connector terminal A and ground?
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Yes
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Repair wiring harness between RFW control module and RFW switch.
Then go to Step 30.
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No
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Go to next step.
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24
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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 30.
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25
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Is there continuity between RFW switch connector terminal B and ground?
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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 30.
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26
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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 30.
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27
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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 30.
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28
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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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Repair vacuum in vacuum hoses.
Then go to Step 30.
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29
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Inspect RFW control module.
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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Repair or replace RFW control module.
Then go to next step.
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30
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Turn ignition switch or 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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