C1402

C1402-TRANSFER CASE RANGE SELECT SWITCH CIRCUIT HIGH





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

- When Monitored:
With the ignition on.

- Set Condition:
Transfer case range select switch voltage greater than 4.86 volts for five seconds.





1. TCASE SWITCH VOLTAGE ABOVE 4.8 VOLTS
1. Ignition on, engine not running.
2. With the scan tool under CCN, read the Transfer Case Switch voltage.

Is the voltage above 4.8 volts?

Yes

- Go To 2

No

- Go To 7

2. (K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT SHORTED TO VOLTAGE




1. Turn the ignition off to the lock position.
2. Disconnect the Transfer Case Selector Switch harness connector.
3. Disconnect the Cluster C4 harness connector.
4. Ignition on, engine not running.
5. Measure the voltage of the (K77) Transfer Case Position Sensor Input circuit.

Is there any voltage present?

Yes

- Repair the (K77) Transfer Case Position Sensor Input circuit for a short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Go To 3

3. (K977) MODE SELECT CIRCUIT SHORTED TO VOLTAGE




1. Turn the ignition off to the lock position.
2. Disconnect the Cluster C3 harness connector.
3. Ignition on, engine not running.
4. Measure the voltage of the (K977) Mode Select circuit.

Is there any voltage present?

Yes

- Repair the (K977) Mode Select circuit for a short to voltage.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Go To 4

4. TRANSFER CASE SELECTOR SWITCH
1. Turn the ignition off to the lock position.
2. Connect the Cluster C3 harness connector.
3. Connect the Cluster C4 harness connector.
4. Ignition on, engine not running.
5. With the scan tool under CCN, read the Transfer Case Switch voltage.

Is the voltage equal to 0.0 volts?

Yes

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

No

- Go To 5

5. (K977) MODE SELECT CIRCUIT OPEN OR HIGH RESISTANCE




1. Turn the ignition off to the lock position.
2. Measure the resistance of the (K977) Mode Select circuit between the Cluster C3 harness connector and the Transfer Case Selector Switch harness connector.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (K977) Mode Select circuit for an open or high resistance.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Go To 6

6. TRANSFER CASE SELECTOR SWITCH (Z905) GROUND CIRCUIT OPEN OR HIGH RESISTANCE




1. Measure the resistance between ground and the (Z905) Transfer Case Selector Switch ground circuit.

Is the resistance above 5.0 Ohms?

Yes

- Repair the Transfer Case Selector Switch (Z905) ground circuit for an open or high resistance.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Replace the Instrument Cluster.
- Perform the BODY VERIFICATION TEST. Body Verification Test and Perform the 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 the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Test complete.