C1401

C1401- TRANSFER CASE RANGE SELECT SWITCH CIRCUIT LOW





For a complete wiring diagram Refer to Diagrams/Electrical Electrical Diagrams


- When Monitored:

Ignition on, engine not running.

- Set Condition:

Transfer Case Range Select Switch voltage less than 0.1568 volts for 5.0 seconds.







Diagnostic Test


1. T-CASE (DTCM) SWITCH VOLTAGE LESS THAN 0.2 VOLTS

Ignition on, engine not running.

With the scan tool, read the T-CASE Switch voltage in the Cluster.

Is the voltage less than 0.2 volts?

Yes

- Go To 2

No

- Go To 5
-


2. (K77) 5 VOLT SELECTOR SWITCH SUPPLY CIRCUIT SHORTED TO GROUND





Turn the ignition off to the lock position

Disconnect the Transfer Case Selector Switch harness connector.

Disconnect the Instrument Cluster C1 harness connector.

Measure the resistance between ground and the (K77) 5 Volt Selector Switch Supply circuit.

Is the resistance less than 5.0 ohms?

Yes

- Repair the (K77) 5 Volt Selector Switch Supply circuit for a short to ground.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests

No

- Go To 3
-


3. TRANSFER CASE SELECTOR SWITCH





Ignition on, engine not running.

With the scan tool in Data Display, read the Range Switch voltage.


NOTE: The switch voltage should be approximately 5.0 volts (±0.2 volts).

Turn the ignition off to the lock position

Connect a jumper wire between the 5 Volt Selector Switch Supply circuit and the Mode Select circuit in the Transfer Case Selector Switch harness connector.

Ignition on, engine not running.


NOTE: The switch voltage should be approximately 0.0 volts (±0.2 volts).

Does the voltage display as described?

Yes

- Replace the Transfer Case Selector Switch.
- Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Verification Tests
No

- Go To 4


4. INSTRUMENT CLUSTER

View repair.

Repair

- Replace the Instrument Cluster.
- Perform the BODY VERIFICATION TEST-VER 1 and Perform the TRANSFER CASE VERIFICATION TEST-VER 1. Body Verification Test Verification Tests


5. 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. Verification Tests

No

- Test complete.