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C140F






C140F-TRANSFER CASE RANGE POSITION SENSOR ERRATIC PERFORMANCE





For a complete wiring diagram refer to Diagrams/Electrical. Electrical Diagrams


- When Monitored:

With the ignition on and no system undervoltage or overvoltage condition present.

- Set Condition:

The Final Drive Control Module detects excessive voltage fluctuation on the Mode Sensor Signal circuit.







Diagnostic Test


1. DTC IS ACTIVE

NOTE: This DTC sets when the Final Drive Control Module detects excessive voltage fluctuation on the Mode Sensor Signal circuit. Perform a thorough inspection of all wiring and connectors between the sensor and the control module.

Ignition on, engine not running.

With the scan tool, read DTCs in the Final Drive Control Module.

Is the status Active for this DTC?

Yes

- Go to 2

No

- Go to 13


2. (T504) DRIVETRAIN 5 VOLT SUPPLY VOLTAGE ERRATIC





NOTE: This DTC sets when the Final Drive Control Module detects excessive voltage fluctuation on the Mode Sensor Signal circuit. Perform a thorough inspection of all wiring and connectors between the sensor and the control module.

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 (T504) Drivetrain 5-volt Supply circuit.


NOTE: Voltage should be approximately 5.0 volts and steady. Compare any slight fluctuations found to a known good circuit in order to verify voltmeter functionality.

Is the voltage approximately 5.0 volts and steady?

Yes

- Go to 6

No

- Go to 3


3. (T504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT INTERMITTENT SHORT 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 (T504) Drivetrain 5-volt Supply circuit.

Monitor the voltmeter while performing a wiggle test on the wiring harness and connectors.

Is any voltage detected on the circuit during the wiggle test?

Yes

- Repair the (T504) Drivetrain 5-volt Supply circuit for an intermittent short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Go to 4


4. (T504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT HIGH RESISTANCE





Measure the resistance of the (T504) Drivetrain 5-volt Supply circuit between the Transfer Case Motor harness connector and the Final Drive Control Module C2 harness connector.

Monitor the ohmmeter while performing a wiggle test on the wiring harness and connectors.

Is the resistance ever above 5.0 ohms during the wiggle test?

Yes

- Repair the (T504) Drivetrain 5-volt Supply circuit for an intermittent open circuit or high resistance.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Go to 5


5. (T504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT INTERMITTENT SHORT TO GROUND





Measure the resistance between ground and the (T504) Drivetrain 5-volt Supply circuit.

Monitor the ohmmeter while performing a wiggle test on the wiring harness and connectors.

Is the resistance ever below 5.0 ohms during the wiggle test?

Yes

- Repair the (T504) Drivetrain 5-volt Supply circuit for an intermittent 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


6. T-CASE POSITION SENSOR VOLTAGE





Turn the ignition off to the lock position

Reconnect the Final Drive Control Module C2 harness connector.

Connect a jumper wire between the (T313) Mode Sensor Signal circuit and the (K594) Drivetrain Sensor Return 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 while performing a wiggle test on the wiring and connectors between the sensor and the control module.


NOTE: Voltage should be approximately 0.0 volts and steady.

Is the T-Case Position Sensor Voltage approximately 0.0 volts and steady?

Yes

- Go to 12

No

- Go to 7


7. (T313) MODE SENSOR SIGNAL CIRCUIT INTERMITTENT SHORT TO VOLTAGE





NOTE: Remove the previously installed jumper wire.

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 (T313) Mode Sensor Signal circuit.

Monitor the voltmeter while performing a wiggle test on the wiring harness and connectors.

Is any voltage detected on the circuit during the wiggle test?

Yes

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

No

- Go to 8


8. (K594) DRIVETRAIN SENSOR RETURN CIRCUIT INTERMITTENT SHORT TO VOLTAGE





Measure the voltage of the (K594) Drivetrain Sensor Return circuit.

Monitor the voltmeter while performing a wiggle test on the wiring harness and connectors.

Is any voltage detected on the circuit during the wiggle test?

Yes

- Repair the (K594) Drivetrain Sensor Return circuit for an intermittent short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Go to 9


9. (T313) MODE SENSOR SIGNAL CIRCUIT HIGH RESISTANCE





Turn the ignition off to the lock position

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.

Monitor the ohmmeter while performing a wiggle test on the wiring harness and connectors.

Is the resistance ever above 5.0 ohms during the wiggle test?

Yes

- Repair the (T313) Mode Sensor Signal circuit for an intermittent open circuit or high resistance.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Go to 10


10. (K594) DRIVETRAIN SENSOR RETURN CIRCUIT HIGH RESISTANCE





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.

Monitor the ohmmeter while performing a wiggle test on the wiring harness and connectors.

Is the resistance ever above 5.0 ohms during the wiggle test?

Yes

- Repair the (K594) Drivetrain Sensor Return circuit for an intermittent open circuit or high resistance.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Transfer Case Verification Test

No

- Go to 11


11. (T313) MODE SENSOR SIGNAL CIRCUIT INTERMITTENT SHORT TO GROUND





Measure the resistance between ground and the (T313) Mode Sensor Signal circuit.

Monitor the ohmmeter while performing a wiggle test on the wiring harness and connectors.

Is the resistance ever below 5.0 ohms during the wiggle test?

Yes

- Repair the (T313) Mode Sensor Signal circuit for an intermittent 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


12. TRANSFER CASE MOTOR

NOTE: This DTC sets when the Final Drive Control Module detects excessive voltage fluctuation on the Mode Sensor Signal circuit. Perform a thorough inspection of all wiring and connectors between the sensor and the control module.

Using the schematic as a guide, inspect the Final Drive Control Module power and ground circuits.

Were any problems found?

Yes

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

No

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


13. 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.
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