C1404

C1404-TRANSFER CASE RANGE POSITION SENSOR CIRCUIT LOW





For a complete wiring diagram Consult Diagrams/Electrical

- 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.





Diagnostic Test

1. T-CASE POSITION SENSOR VOLTAGE BELOW 0.4 VOLTS
Ignition 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. Transfer Case Verification Test.

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. Transfer Case Verification Test.

No

- Replace the Final Drive Control Module.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test.

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.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test.

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. Transfer Case Verification Test.

No

- Replace the Final Drive Control Module.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test.

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. Transfer Case Verification Test.

No

- Test complete.