C145A-AWD CLUTCH RETURN CONTROL CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
The Solenoid is active, no solenoid supply circuit DTCs are present and battery voltage is normal.
- Set Condition:
The AWD Module detects the Rear Differential Solenoid Supply is shorted low.
| Possible Causes |
| (T78) SOLENOID SUPPLY VOLTAGE OPEN |
| (T78) SOLENOID SUPPLY VOLTAGE SHORTED TO GROUND |
| (T312) REAR DIFFERENTIAL SOLENOID CONTROL CIRCUIT SHORTED TO GROUND |
| (T312) REAR DIFFERENTIAL SOLENOID CONTROL CIRCUIT OPEN |
| (AWD) CONTROL MODULE |
| ELECTRONIC CONTROLLED CLUTCH (ECC) |
Diagnostic Test
1. ACTIVE DTCIgnition on, engine not running.
With the scan tool, read DTCs.
Is the DTC active at this time?
Yes
- Go To 2
No
- Go To10
2. ECC SOLENOID OPERATION
Turn the ignition off.
Disconnect the ECC Solenoid harness connector.
Ignition on, engine not running.
Using a 12-volt test light, jump across from the (T78) Solenoid Supply Voltage circuit and the (T312) Rear Differential Solenoid Control circuit in the ECC Solenoid harness connector.
With the scan tool, actuate the ECC Solenoid.
Does the test light illuminate brightly and flash on and off?
Yes
- Go To7
No
- Go To 3
3. (T78) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (T78) Solenoid Supply Voltage circuit at the ECC Solenoid harness connector.
Is the resistance below 100 ohms?
Yes
- Repair the short to ground in the (T78) Solenoid Supply Voltage circuit.
- Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE)
No
- Go To 4
4. (T78) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT OPEN
Measure the resistance of the (T78) Solenoid Supply Voltage circuit between the ECC Solenoid harness connector and the AWD Control Module harness connector.
Is the resistance below 5.0 ohms?
Yes
- Go To 5
No
- Repair the open in the (T78) Solenoid Supply Voltage circuit.
- Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE)
5. (T312) REAR DIFFERENTIAL SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the AWD Control Module harness connector.
Measure the resistance between ground and the (T312) Rear Differential Solenoid Control circuit at the AWD Module harness connector.
Is the resistance below 100 ohms?
Yes
- Repair the short to ground in the (T312) Rear Differential Solenoid Control circuit.
- Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE)
No
- Go To 6
6. (T312) REAR DIFFERENTIAL SOLENOID CONTROL CIRCUIT OPEN
Measure the resistance of the (T312) Rear Differential Solenoid Control circuit between the ECC Solenoid harness connector and the AWD Control Module harness connector.
Is the resistance below 5.0 ohms?
Yes
- Go To 7
No
- Repair the open in the (T312) Rear Differential Solenoid Control circuit.
- Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE)
7. ECC SOLENOID (T312) REAR DIFFERENTIAL SOLENOID CONTROL CIRCUIT SHORTED INTERNALLY
Turn the ignition off.
Disconnect the AWD Control Module harness connector.
Connect the ECC Solenoid harness connector.
Measure the resistance between ground and the (T312) Rear Differential Solenoid Control circuit at the AWD Module harness connector.
Is the resistance below 100 ohms?
Yes
- Repair the short to ground in the (T312) Rear Differential Solenoid Control circuit.
- Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE)
No
- Go To 8
8. AWD CONTROL MODULE
NOTE: Before continuing, check the AWD Control Module 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 AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE)
No
- Replace AWD Control Module in accordance with Service Information.
- Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE)
9. ELECTRONICALLY CONTROLLED CLUTCH (ECC)
NOTE: Before continuing, check the ECC Solenoid jumper harness connector terminals for corrosion, damage, or terminals push out, repair/replace 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 AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE)
No
- Replace ECC in accordance with Service Information.
- Perform AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE)
10. 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 AWD Control Module VERIFICATION TEST. (Refer to 3 - DIFFERENTIAL & DRIVELINE/ELECTRONICALLY CONTROLLED CLUTCH - STANDARD PROCEDURE)
No
- Test Complete.