C1405

C1405-TRANSFER CASE RANGE POSITION SENSOR CIRCUIT HIGH





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the ignition on and no system undervoltage or overvoltage condition present.

- Set Condition:
The sensor voltage is above a specified value for a calibrated amount of time.





Diagnostic Test

1. T-CASE POSITION SENSOR VOLTAGE ABOVE 4.8 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 above 4.8 volts?

Yes

- Go To 2

No

- Go to 7

2. (K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORTED TO 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 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. Transfer Case Verification Test.

No

- Go to 3

3. (T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE




Measure the voltage of the (T313) Mode Sensor Signal circuit.
Is the voltage above 5.5 volts?

Yes

- Repair the (T313) Mode Sensor Signal circuit for a short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test.

No

- Go to 4

4. TRANSFER CASE MOTOR




Turn the ignition off to the lock position
Connect a jumper wire between the (K594) Drivetrain Sensor Return circuit and the (T313) Mode Sensor Signal circuit in the Transfer Case Motor harness connector.
Ignition on, engine not running.
With the scan tool, read the T-Case Position Sensor voltage in the Final Drive Control Module.

NOTE: Remove the jumper wire before continuing.

Is the voltage below 0.2 volts?

Yes

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

No

- Go to 5

5. (T313) MODE SENSOR SIGNAL CIRCUIT OPEN




Turn the ignition off to the lock position
Disconnect the Final Drive Control Module C2 harness connector.
Measure the resistance of the (T313) Mode Sensor Signal 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 (T313) Mode Sensor Signal circuit for an open.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test.

No

- Go to 6

6. (K594) DRIVETRAIN SENSOR RETURN CIRCUIT OPEN




Measure the resistance of the (K594) Drivetrain Sensor Return 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 (K594) Drivetrain Sensor Return circuit for an open.
- 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.