Pinpoint Test T: The 4X4 Low Range Indicator Is Never/Always On
- T1 VERIFY THE FOUR WHEEL DRIVE OPERATION
- Test drive the vehicle and verify that the vehicle is in two wheel drive when the 4x4 LOW is switched off and that the four wheel drive low operates when switched to the 4x4 LOW range.
- Does the 4x4 LOW range operate correctly?
- T2 CARRY OUT THE INSTRUMENT CLUSTER WARNING LAMPS AND CHIME ACTIVE COMMAND USING THE DIAGNOSTIC TOOL
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
- Select the instrument cluster warning lamps and chime active command. Trigger the all lamps active command on and off. Observe the 4x4 LOW indicator.
- Does the 4x4 LOW indicator illuminate when triggered on and turn off when triggered off?
- Yes
: GO to T3.
- No
: GO to T4.
- T3 CHECK FOR CORRECT POWERTRAIN CONTROL MODULE (PCM) MODULE OPERATION
- Disconnect all the PCM connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all the PCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes
: INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS
. TEST the system for normal operation.
- No
: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
- T4 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect all the instrument cluster connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all the instrument cluster connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes
: INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
- No
: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.