Diagnostic Test
- TRANSFER CASE POSITION SENSOR VOLTAGE BELOW 0.2 VOLTS
- (T103) 5-VOLT SUPPLY CIRCUIT VOLTAGE BELOW 0.2 VOLTS
- (T103) 5-VOLT SUPPLY CIRCUIT OPEN
- Turn the ignition off to the lock position.
- Disconnect the Front Control Module C1 harness connector.
- Measure the resistance of the (T103) 5-volt Supply circuit between the Shift Motor/Mode Sensor harness connector and the Front Control Module C1 harness connector.
Is the resistance above 5.0 ohms?
Yes
- Repair the (T103) 5-volt Supply circuit for an open.
- Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
No
- Go to step 4
- (T103) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
- Measure the resistance between ground and the (T103) 5-volt Supply circuit.
Is the resistance below 5.0 ohms?
Yes
- Repair the (T103) 5-volt Supply circuit for a short to ground.
- Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
No
- Go to step 5
- Measure the resistance between ground and the (T103) 5-volt Supply circuit.
- TRANSFER CASE POSITION SENSOR VOLTAGE
- With the scan tool, read the Transfer Case Position Sensor voltage.
Is the voltage above 4.5 volts?
Yes
- Go to step 6
No
- Replace the Front Control Module in accordance with Service Information.
- Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
- With the scan tool, read the Transfer Case Position Sensor voltage.
- (D201) MODE SENSOR A CIRCUIT SHORTED TO GROUND
- Turn the ignition off to the lock position.
- Measure the resistance between ground and the (D201) Mode Sensor A circuit.
Is the resistance below 5.0 ohms?
Yes
- Repair the (D201) Mode Sensor A circuit for a short to ground.
- Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
No
- Replace the Shift Motor/Mode Sensor Assembly.
- Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
- CHECK THE WIRING AND CONNECTORS
- The conditions necessary to set this DTC are not present at this time.
- Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
- While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
- Look for the data to change or for the DTC to reset during the wiggle test.
Were any problems found?
Yes
- Repair as necessary.
- Perform the TRANSFER CASE VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
No
- Test complete.