C1402-TRANSFER CASE RANGE SELECT SWITCH CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the ignition on and no system undervoltage or overvoltage condition present.
- Set Condition:
Transfer Case 4WD Range Switch voltage is greater than a specified voltage for a calibrated amount of time.
| Possible Causes |
| (K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE |
| (K977) MODE SELECT CIRCUIT SHORTED TO VOLTAGE |
| TRANSFER CASE SELECTOR SWITCH (Z907) GROUND CIRCUIT OPEN |
| TRANSFER CASE SELECTOR SWITCH |
| FINAL DRIVE CONTROL MODULE |
Diagnostic Test
1. 4WD RANGE SWITCH VOLTAGE ABOVE 4.5 VOLTSIgnition on, engine not running.
NOTE: Repair any system undervoltage or overvoltage DTCs that are set in this module before proceeding.
With the scan tool, read the 4WD Range Switch voltage in the Final Drive Control Module.
Is the voltage above 4.5 volts?
Yes
- Go To 2
No
- Go to 5
2. TRANSFER CASE SELECTOR SWITCH
Turn the ignition off to the lock position
Disconnect the Transfer Case Selector Switch harness connector.
Ignition on, engine not running.
With the scan tool, read the 4WD Range Switch voltage in the Final Drive Control Module.
Is the voltage equal to 0 volts?
Yes
- Replace the Transfer Case Selector Switch.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - STANDARD PROCEDURE).
No
- Go to 3
3. (K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
Measure the voltage of the (K504) Drivetrain 5 Volt Supply circuit.
Is the voltage above 5.5 volts?
Yes
- Repair the (K504) Drivetrain 5 Volt Supply circuit for a short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - STANDARD PROCEDURE).
No
- Go to 4
4. (K977) MODE SELECT CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off to the lock position
Disconnect the Final Drive Control Module C2 harness connector.
Ignition on, engine not running.
Measure the voltage of the K977) Mode Select circuit.
Is there any voltage present?
Yes
- Repair the (K977) Mode Select circuit for a short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - STANDARD PROCEDURE).
No
- Replace the Final Drive Control Module in accordance with the Service Information.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - STANDARD PROCEDURE).
5. INTERMITTENT 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.
While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times.
Look for the data to change other than as expected or for the DTC to reset.
Were any problems found?
Yes
- Repair as necessary.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - STANDARD PROCEDURE).
No
- Test complete.