C1401

C1401-TRANSFER CASE RANGE SELECT SWITCH CIRCUIT LOW





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 less than 0.1568 of a volt for five seconds





1. TRANSFER CASE SWITCH VOLTAGE LESS THAN 0.2 OF A VOLT
1. Ignition on, engine not running.
2. With the scan tool under CCN, read the Transfer Case Switch voltage.

Is the voltage less than 0.2 of a volt?

Yes

- Go To 2

No

- Go To 8

2. (K77) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT VOLTAGE LESS THAN 0.2 OF A VOLT




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

Is the voltage less than 0.2 of a volt?

Yes

- Go To 3

No

- Go To 5

3. (K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT OPEN OR HIGH RESISTANCE




1. Turn the ignition off to the lock position.
2. Disconnect the Cluster C4 connector.
3. Measure the resistance of the (K77) Transfer Case Position Sensor Input circuit between the Instrument Cluster C4 harness connector and the Transfer Case Selector Switch harness connector.

Is the resistance greater than 5.0 Ohms?

Yes

- Repair the (K77) Transfer Case Position Sensor Input circuit for an open or high resistance.
- Perform the TRANSFER CASE VERIFICATION TEST. Transfer Case Verification Test.

No

- Go To 4

4. (K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT SHORTED TO GROUND




1. Measure the resistance between ground and the (K77) Transfer Case Position Sensor Input circuit.

Is the resistance less than 5.0 Ohms?

Yes

- Repair the (K77) Transfer Case Position Sensor Input circuit for a short to ground.
- 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.

5. TRANSFER CASE SELECTOR SWITCH




1. Turn the ignition off to the lock position.
2. Connect a jumper wire between the (K77) Transfer Case Position Sensor Input circuit and the (K977) Mode Select circuit at the Transfer Case Selector Switch harness connector.
3. Ignition on, engine not running.
4. With the scan tool in Data Display, read the Range Switch voltage.

NOTE: The switch voltage should be approximately 5.0 volts ( ±.05 of a volt).

Does the voltage display as described?

Yes

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

No

- Go To 6

6. (K977) MODE SELECT CIRCUIT SHORTED TO GROUND




1. Disconnect the Cluster C3 connector.
2. Measure the resistance between ground and the (K977) Mode Select circuit.

Is the resistance less than 5.0 Ohms?

Yes

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

No

- Go To 7

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




1. 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

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

8. 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.