C1417

C1417-FRONT DIFFERENTIAL CONTROL CIRCUIT LOW





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


- When Monitored:

The Solenoid is active, no solenoid supply circuit DTCs are present and battery voltage is normal.

- Set Condition:

The FDCM detects the Front Differential Solenoid Control is shorted low.








Diagnostic Test


1. ACTIVE DTC

Ignition on, engine not running.

With the scan tool, read DTCs.

Is the DTC active at this time?

Yes

- Go To 2

No

- Go To 8



2. FRONT DIFFERENTIAL SOLENOID OPERATION





Turn the ignition off.

Disconnect the Front Differential Solenoid harness connector.

Ignition on, engine not running.

Using a 12-volt test light, jump across from the (T301) Switch Battery Solenoid Supply circuit and the (T306) Front Differential Solenoid Control circuit in the Front Differential Solenoid harness connector.

With the scan tool, clear DTCs in the FDCM.

With the scan tool, actuate the Front Differential Solenoid.

Does the test light illuminate brightly and flash on and off?

Yes

- Inspect the Front Differential Solenoid Jumper harness, repair/replace as necessary. If OK, replace the Front Differential Solenoid.
- Perform FDCM VERIFICATION TEST. FDCM Verification Test

No

- Go To 3



3. (T306) FRONT DIFFERENTIAL SOLENOID CONTROL CIRCUIT SHORTED TO GROUND





Turn the ignition off.

Disconnect the FDCM harness connector.

Measure the resistance of the (T306) Front Differential Solenoid Control circuit at the FDCM harness connector to ground.

Is the resistance below 100 ohms?

Yes

- Repair the short to ground in the Front Differential Solenoid Control circuit.
- Perform FDCM VERIFICATION TEST. FDCM Verification Test

No

- Go To 4



4. (T306) FRONT DIFFERENTIAL SOLENOID CONTROL CIRCUIT OPEN





Measure the resistance of the (T306) Front Differential Solenoid Control circuit between the Front Differential Solenoid harness connector and the FDCM harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 5

No

- Repair the open in the (T306) Front Differential Solenoid Control circuit.
- Perform FDCM VERIFICATION TEST. FDCM Verification Test



5. (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT SHORTED TO GROUND





Measure the resistance of the (T301) Switched Battery Solenoid Supply circuit at the Front Solenoid Differential harness connector to ground.

Is the resistance below 100 ohms?

Yes

- Repair the short to ground in the (T301) Switched Battery Solenoid Supply circuit.
- Perform FDCM VERIFICATION TEST. FDCM Verification Test

No

- Go To 6



6. (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT OPEN





Measure the resistance of the (T301) Switched Battery Solenoid Supply circuit between the Front Differential Solenoid harness connector and the FDCM harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 7

No

- Repair the open in the (T301) Switched Battery Solenoid Supply circuit.
- Perform FDCM VERIFICATION TEST. FDCM Verification Test



7. FDCM


NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes

- Repair as necessary.
- Perform FDCM VERIFICATION TEST. FDCM Verification Test

No

- Replace and program the Final Drive Control Module in accordance with Service Information.
- Perform FDCM VERIFICATION TEST. FDCM Verification Test



8. INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set this DTC are not present at this time.

Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.

Wiggle test the wiring harness and connectors while checking for shorted and open circuits.

Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to change or for the DTC to reset.

Were there any problems found?

Yes

- Repair as necessary.
- Perform FDCM VERIFICATION TEST. FDCM Verification Test

No

- Test Complete.