C1404

C1404-TRANSFER CASE RANGE POSITION SENSOR CIRCUIT LOW





For a complete wiring diagram, refer to the Wiring Information

- 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.





1. T-CASE POSITION SENSOR VOLTAGE BELOW 0.4 VOLTS
1. Ignition on, engine not running.
2. With the scan tool, read the T-Case Position Sensor voltage in the FDCM.

Is the voltage below 0.4 volts?

Yes

- Go To 2

No

- Go To 7

2. (K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT VOLTAGE




1. Turn the ignition off to the lock position
2. Disconnect the Transfer Case Motor harness connector.
3. Ignition on, engine not running.
4. 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




1. Turn the ignition off to the lock position
2. Disconnect the FDCM C2 harness connector.
3. 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 TRANSFER CASE VERIFICATION TEST Transfer Case Verification Test.

No

- Go To 4

4. (K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND




1. 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 TRANSFER CASE VERIFICATION TEST Transfer Case Verification Test.

No

- Replace the Final Drive Control Module (FDCM).
- Perform TRANSFER CASE VERIFICATION TEST Transfer Case Verification Test.

5. TRANSFER CASE MOTOR
1. With the scan tool, read the T-Case Position Sensor voltage in the FDCM.

Is the voltage above 4.5 volts?

Yes

- Replace the Transfer Case Motor.
- Perform TRANSFER CASE VERIFICATION TEST Transfer Case Verification Test.

No

- Go To 6

6. (T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND




1. 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 TRANSFER CASE VERIFICATION TEST Transfer Case Verification Test.

No

- Replace the Final Drive Control Module.
- Perform TRANSFER CASE VERIFICATION TEST Transfer Case Verification Test.

7. INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
3. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
4. 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 TRANSFER CASE VERIFICATION TEST Transfer Case Verification Test.

No

- Test complete.