DTC C1422: VDC Interruption For Engine Convenience

DTC detecting condition: 

A fault is detected if engine control prohibition flag from ECM is received.

Trouble symptom: 

• VDC does not operate.
• AVH does not function.
  NOTE: The warning light goes off if the engine control prohibition flag from ECM returns normally.

1. CHECK COOPERATION CONTROL FEASIBILITY OF ECM USING SUBARU SELECT MONITOR. 
   1. Start the engine, and run the engine at idle approximately 5 minutes.
   2. Select the [Data Monitor] using Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DATA MONITOR .
   3. Check [E/G Torque Down Control Stop Flag] on the display screen.

   Is "1" displayed in [E/G Torque Down Control Stop Flag]?

   Yes  : Go to  4.

   No  : Go to  2.

2. CHECK WARNING LIGHT. 

   Check whether the VDC warning light illuminates after driving for 1 minute or more at a speed of 10 km/h (6 MPH) or more.

   Does the VDC warning light illuminate?

   Yes  : Go to  3.

   No  : VDC is normal. Clear the memory. Ref. to COMMON (diag)>CLEAR MEMORY .

   NOTE: DTC may be recorded if cranking is performed during driving.
3. CHECK POOR CONTACT OF CONNECTORS. 

   Is there poor contact of ECM connector?

   Yes  : Repair the connector.

   No  : Go to  4.

4. CHECK DTC OF ECM. 

   Read the DTC relating the ECM using the Subaru Select Monitor. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Are any DTCs displayed?

   Yes  : Perform the diagnosis according to DTC. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

   No  : Go to  5.

5. CHECK VDCCM & H/U. 
   1. Connect all connectors.
   2. Using the Subaru Select Monitor, perform the clear memory. Ref. to COMMON (diag)>CLEAR MEMORY .
   3. Execute the inspection mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>INSPECTION MODE .
   4. Read the DTC using Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is the same DTC displayed?

   Yes  : Replace the VDCCM & H/U. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U) .

   No  : Go to  6.

6. CHECK DETECTION OF OTHER DTCS FOR VDC. 

   Read the DTC using Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is any other DTC displayed?

   Yes  : Perform the diagnosis according to DTC. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

   No  : Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.