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C1480






C1480-TRANSFER CASE RANGE DIGITAL POSITION SENSOR PERFORMANCE

For a complete wiring diagram, refer to the Wiring Information.





For a complete wiring diagram, refer to the Wiring Information.

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

- Set Condition:
The Drive Train Control Module (DTCM) detects excessive voltage fluctuation on the Mode Sensor Signal circuit.





Diagnostic Test

1. VERIFY THE DTC IS ACTIVE

NOTE: This DTC sets when the Drive Train Control Module (DTCM) 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.

1. Ignition on, engine not running.
2. With the scan tool, record and erase DTCs.
3. Test drive the vehicle
4. Ignition on, engine not running.
5. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes

- Go To 2

No

- Go To 7

2. (K504) DRIVETRAIN 5-VOLT SUPPLY VOLTAGE ERRATIC

NOTE: This DTC sets when the Drive Train Control Module (DTCM) 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.

1. Turn the ignition off to the lock position.
2. Disconnect the Transfer Case Shift Motor/Mode Sensor Assembly harness connector.
3. Ignition on, engine not running.
4. Measure the voltage of the (K504) Drivetrain 5-volt Supply circuit at the Transfer Case Shift Motor/Mode Sensor Assembly harness connector.

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. (K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT INTERMITTENT SHORT TO VOLTAGE
1. Turn the ignition off to the lock position
2. Disconnect the DTCM C1 harness connector.
3. Ignition on, engine not running.
4. Measure the voltage of the (K504) Drivetrain 5-volt Supply circuit at the Transfer Case Shift Motor/Mode Sensor Assembly harness connector.
5. 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 (K504) Drivetrain 5-volt Supply circuit for an intermittent short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Go To 4

4. (K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT HIGH RESISTANCE
1. Measure the resistance of the (K504) Drivetrain 5-volt Supply circuit between the Transfer Case Shift Motor/Mode Sensor Assembly harness connector and the DTCM C1 harness connector.
2. 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 (K504) Drivetrain 5-volt Supply circuit for an intermittent open circuit or high resistance.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Go To 5

5. (K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT INTERMITTENT SHORT TO GROUND
1. Measure the resistance between ground and the (K504) Drivetrain 5-volt Supply circuit at the Transfer Case Shift Motor/Mode Sensor Assembly harness connector.
2. 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 (K504) Drivetrain 5-volt Supply circuit for an intermittent short to ground.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Replace the Drive Train Control Module (DTCM).
- Perform the DTCM VERIFICATION TEST. DTCM Verification Test.

6. TRANSFER CASE SHIFT MOTOR/MODE SENSOR ASSEMBLY
1. Replace the Transfer Case Shift Motor/Mode Sensor Assembly.Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.
2. Test drive the vehicle.
3. With the scan tool, read the DTCs in the DTCM.

Does this DTC reset?

Yes

- Replace the Drive Train Control Module (DTCM).
- Perform the DTCM VERIFICATION TEST. DTCM Verification Test.

No

- Test complete.

7. INTERMITTENT WIRING HARNESS 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 harness and connectors.
3. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
4. Look for the data to change or for the DTC to reset during the wiggle test.
5. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times.
6. Look for the data to change other than as expected or for the DTC to reset.

Were any problems found?

Yes

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

No

- Test complete.

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