Diagnostic Test
- 1) 4WD MODE SENSOR DTC PRESENT NOTE: With the scan tool, ensure that the Instrument Cluster is configured for the correct transfer case before proceeding with this test.
With the scan tool, read DTCs.
Does the scan tool display any 4WD Mode Sensor DTCs?
Yes
- Refer to appropriate ENGINE - ELECTRICAL DIAGNOSTICS article and perform the appropriate symptom.
No
- Go To step 2).
- 2) INSTRUMENT CLUSTER
Perform the Instrument Cluster Self Test.
Depress and hold the Trip Odometer reset button while turning the ignition from the off to the on position.
Did the 4WD indicator in question illuminate?
Yes
- Go To step 3).
No
- Replace and configure the Instrument Cluster in accordance with the Service Information.
- Perform BODY VERIFICATION TEST .
- 3) TRANSFER CASE POSITION SENSOR
Turn the ignition on.
With the scan tool in Sensors, read the T-Case Position while moving the transfer case shift lever through all of the positions.
The scan tool should display the following values:
4WD Lo: 0.96 - 1.35 volts
Neutral: 2.39 - 2.76 volts
Full Time: 3.2 - 3.5 volts
Part Time: 3.7 - 4.0 volts
2WD: 4.17 - 4.45 volts
Is the Transfer Case Position voltage within the specified ranges?
Yes
- The condition is not present at this time. Monitor scan tool parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness and connector terminals.
No
- Replace the Transfer Case Position Sensor in accordance with the Service Information.
- Perform POWERTRAIN VERIFICATION TEST .