DTC U0430: Invalid Data Received From Tire Pressure Monitor Control Module And/Or Keyless Entry Control Module

DTC detecting condition: 

Defective data was transmitted from TPMS & keyless entry control module or keyless entry control module.

Trouble symptom: 

Keyless entry or TPMS does not operate normally.

1. CHECK CAN COMMUNICATION HARNESS  .

   Perform the basic diagnostic procedure to check for fault in CAN communication harness. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

   Was the basic diagnostic procedure performed up to step 7?

   Yes  : Go to  2.

   No  : Perform the basic diagnostic procedure. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

2. CHECK DTC (OTHER THAN U-CODE)  .

   Check the displayed DTC.

   Is DTC other than U*** displayed? (Current malfunction)

   Yes  : Perform the diagnosis for DTCs other than the displayed U-code.

   No  : Go to  3.

3. CHECK DTC (U-CODE)  .

   Check the displayed DTC.

   Is DTC for the bus off or the data no-receive displayed? (Current malfunction)

   Yes  : Perform the diagnosis for DTCs for the displayed bus off or the data no-receive.

   No  : Go to  4.

4. CHECK DTC  .

   Check the displayed DTC.

   Is DTC U0430 displayed? (Current malfunction)

   Yes  : Go to  5.

   No  : Go to  7.

5. CHECK DTC  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the TPMS & keyless entry control module or keyless entry control module connector.
   3. Connect the disconnected connectors.
   4. Using the Subaru Select Monitor, read all DTCs. Ref. to LAN SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC U0430 displayed? (Current malfunction)

   Yes  : Go to  6.

   No  : Go to  7.

6. CHECK DTC  .

   Using the Subaru Select Monitor, read all DTCs. Ref. to LAN SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC U0430 detected in several modules? (Current malfunction)

   Yes  : Replace the TPMS & keyless entry control module or keyless entry control module. Ref. to SECURITY AND LOCKS>KEYLESS ENTRY CONTROL MODULE . Ref. to WHEEL AND TIRE SYSTEM>TIRE PRESSURE MONITORING SYSTEM .

   No  : Replace the module that the DTC has been detected.

7. CHECK HARNESS  .
   1. Shake the harness, and check for poor contact.
   2. Using the Subaru Select Monitor, read all DTCs. Ref. to LAN SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC U0430 displayed? (Current malfunction)

   Yes  : Repair the poor contact of harness, or replace the harness.

   No  : Go to  8.

8. CHECK CONNECTOR  .

   Check the connector used for high speed CAN for poor contact.

   Is there poor contact of connector?

   Yes  : Repair the connector that has poor contact, or replace harness.

   No  : It is possible that temporary poor communication occurs. Delete the DTC.