C1402

C1402- TRANSFER CASE RANGE SELECT SWITCH CIRCUIT HIGH







- 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) 5-VOLT SELECTOR SWITCH SUPPLY 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 C3 harness connector.
4. Ignition on, engine not running.
5. Measure the voltage of the (K77) 5-volt Selector Switch Supply circuit.

Is there any voltage present?

Yes

- Repair the (K77) 5-volt Selector Switch Supply 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. 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. Ignition on, engine not running.
4. 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




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

No

- Go To 6

6. TRANSFER CASE SELECTOR SWITCH (Z910) GROUND CIRCUIT OPEN




1. Measure the resistance between ground and the (Z910) Transfer Case Selector Switch ground circuit.

Is the resistance above 5.0 Ohms?

Yes

- Repair the Transfer Case Selector Switch (Z910) ground circuit for an open.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Replace the Cluster Cabin Node (CCN).
- Perform the BODY VERIFICATION TEST. Body Verification Test.

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.