C1404-TRANSFER CASE RANGE POSITION SENSOR CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the ignition on and no system undervoltage or overvoltage or supply voltage low conditions present.
- Set Condition:
Sensor input voltage is below a specified value for a calibrated amount of time.
| Possible Causes |
| INTERMITTENT TRANSFER CASE RANGE POSITION SENSOR CIRCUIT LOW |
| (K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT OPEN |
| (K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND |
| (T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND |
| TRANSFER CASE MOTOR |
| FINAL DRIVE CONTROL MODULE |
Diagnostic Test
1. T-CASE POSITION SENSOR VOLTAGE BELOW 0.4 VOLTSIgnition on, engine not running.
With the scan tool, read the T-Case Position Sensor voltage in the Final Drive Control Module .
Is the voltage below 0.4 volts?
Yes
- Go to 2
No
- Go to 7
2. (K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT VOLTAGE
Turn the ignition off to the lock position
Disconnect the Transfer Case Motor harness connector.
Ignition on, engine not running.
Measure the voltage of the (K504) Drivetrain 5-volt Supply circuit.
Is the voltage below 0.2 volts?
Yes
- Go to 3
No
- Go to 5
3. (K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT OPEN
Turn the ignition off to the lock position
Disconnect the Final Drive Control Module C2 harness connector.
Measure the resistance of the (K504) Drivetrain 5-volt Supply circuit between the Transfer Case Motor harness connector and the Final Drive Control Module C2 harness connector.
Is the resistance above 5.0 ohms?
Yes
- Repair the (K504) Drivetrain 5-volt Supply circuit for an open.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - STANDARD PROCEDURE).
No
- Go to 4
4. (K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (K504) Drivetrain 5-volt Supply circuit.
Is the resistance below 5.0 ohms?
Yes
- Repair the (K504) Drivetrain 5-volt Supply circuit for a short to ground.
- 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. TRANSFER CASE MOTOR
With the scan tool, read the T-Case Position Sensor voltage in the Final Drive Control Module.
Is the voltage above 4.5 volts?
Yes
- Replace the Transfer Case Motor in accordance with the Service Information.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - STANDARD PROCEDURE).
No
- Go to 6
6. (T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (T313) Mode Sensor Signal circuit.
Is the resistance below 5.0 ohms?
Yes
- Repair the (T313) Mode Sensor Signal circuit for a short to ground.
- 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).
7. 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.
Were any problems found?
Yes
- Repair as necessary.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1 (Refer to 21 - TRANSMISSION/TRANSAXLE/TRANSFER CASE - DIAGNOSIS AND TESTING).
No
- Test complete.