DTC C1020-49, C1021-49

DTC C1020-49  : VSA Master Cut Valve Failure (Unexpected Operation)DTC C1021-49  : VSA Suction Valve Failure (Unexpected Operation)

NOTE: Before you troubleshoot, review the general troubleshooting information .

DTC (VSA)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode, then start the engine.

   -4. Wait 20 seconds or more.

   -5. Test-drive the vehicle at 9 mph (15 km/h) or more.

   NOTE:  Drive the vehicle on the road, not on a lift.

   -6. Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame
   C1020-49 VSA Master Cut Valve Failure (Unexpected Operation)
   C1021-49 VSA Suction Valve Failure (Unexpected Operation)

   Is DTC C1020-49 or C1021-49 indicated?

   YES 

   The failure is duplicated. Check for loose terminals and poor connections in the VSA modulator-control unit 46P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the VSA modulator-control unit .

   NO 

   Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting . If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.