DTC U0073 Control Module Communication Bus Off
DTC detecting condition:
- Data to be received via CAN communication do not arrive.
- A/C cooperation control does not operate.
Trouble symptom:
A/C does not operate fully automatically.
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK LAN SYSTEM. Check LAN system using the Subaru Select Monitor. <Ref. to BASIC DIAGNOSTIC PROCEDURE .> |
Is the check result OK? | Go to step 2 . | Perform the diagnosis according to the inspection for LAN system. |
2 CHECK A/C Control Module.
|
Is DTC U0073 displayed? | Go to step 3 . | Replace the A/C Control Module. <Ref. to REMOVAL , Control Unit.> |
| 3 CHECK CAN COMMUNICATION CIRCUIT. Check the CAN communication circuit. <Ref. to LIST , CAN Communication Circuit Check.> |
Is the check result OK? | It is possible that temporary poor communication occurs. Clear the memory. <Ref. to CLEAR MEMORY MODE .> | Repair or replace the CAN communication circuit. |