DTC U0029-00 (VSA Control Unit: Without ACC)

DTC U0029-00  : CAN Communication Failure (Bus OFF Ch 1)

NOTE: 

• This DTC is stored by communication failure between the F-CAN line and the VSA modulator-control unit. When DTC U0029-00 is indicated, the F-CAN line has already returned to normal. Check for loose terminals and poor connections at the connectors. If the connectors are OK, clear the DTC and follow this troubleshooting.
• Troubleshoot any PGM-FI system DTCs first .
• Before you troubleshoot, review the general troubleshooting information .

DTC (VSA)

1. VSA modulator-control unit communication check

   -1. Turn the vehicle to the ON mode.

   -2. Check for communication between the VSA modulator-control unit and the HDS.

   Is there communication between the VSA modulator-control unit and the HDS?

   YES 

   Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting .

   NO 

   Go to step 2.

2. Open wire check (F-CAN A H, F-CAN A L lines)

   -1. Turn the vehicle to the OFF (LOCK) mode with driver's door open.

   -2. Jump the SCS line with the HDS, and wait more than 1 minute.

   -3. Wait for 3 minutes.

   NOTE:  Do not close the driver's door.

   -4. Disconnect the following connectors.

   VSA modulator-control unit 46P connector

   PCM connector A (50P)

   -5. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	VSA modulator-control unit 46P connector: disconnected
   	PCM connector A (50P): disconnected
   Test point 1	VSA modulator-control unit 46P connector No. 20
   Test point 2	PCM connector A (50P) No. 37

   Test point 1	VSA modulator-control unit 46P connector No. 21
   Test point 2	PCM connector A (50P) No. 36

   Is there continuity?

   YES 

   The F-CAN A H and F-CAN A L wires are OK. 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 

   Repair an open in the wire between the VSA modulator-control unit and the PCM.