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.

Failure detection pattern: 

• "Secondary" (low-priority diagnosis)

Warning light/indicator light: 

The combination of DTC and warning light display may differ from the list depending on vehicle conditions and driving conditions at the time of failure detection.

• ABS warning light -
• VDC warning light & VDC operation indicator light◦
• Electronic parking brake warning light (red) -
• Brake warning light (EBD warning light) (red) -

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. Using the Subaru Select Monitor, read data of [E/G Torque Down Control Stop Flag] in the [Data Monitor] of [Brake Control]. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DATA MONITOR .

   Is the [E/G Torque Down Control Stop Flag] set to [1]?

   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 System is normal. Using the Subaru Select Monitor, perform the clear memory of [Brake Control]. Ref. to COMMON (DIAGNOSTICS)>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 of [Engine] using the Subaru Select Monitor. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0)>DIAGNOSTIC TROUBLE CODE (DTC) . Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.5)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Are any DTCs displayed?

   Yes:  Perform the diagnosis according to the DTC. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST . Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.5)>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 of [Brake Control]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY .
   3. Execute the inspection mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>INSPECTION MODE .
   4. Read the DTC of [Brake Control] using the 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 of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is any other DTC displayed?

   Yes:  Perform the diagnosis according to the 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.