DTC U0029-00
DTC U0029-00 : CAN Communication Failure (Bus OFF Ch 1)
NOTE:
- Before you troubleshoot, review the general troubleshooting information - Refer to:
- Troubleshoot any PGM-FI DTCs first.
- 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 in the connectors. If the connectors are OK, clear the DTC and following this troubleshooting.
| DTC Description | DTC | Freeze Frame |
|---|---|---|
| U0029-00 CAN Communication Failure (Bus OFF Ch 1) |
DTC (VSA)
- VSA modulator-control unit communication check
- 1. Start the engine.
- 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 - Refer to:
How to Troubleshoot the VSA System (2014 2015 2016) or
How to Troubleshoot the VSA System (2017 2018 2019 2020)
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.
NO
Go to step 2.
- Open wire check (F-CAN A_H, F-CAN A_L lines)
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Jump the SCS line with the HDS, and wait more than 1 minute.
- 3. Disconnect the following connectors.
VSA modulator-control unit 38P connector PCM connector A (51P) - 4. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode VSA modulator-control unit 38P connector: disconnected PCM connector A (51P): disconnected Test circuit 1 Test point 1 VSA modulator-control unit 38P connector No. 38 - Refer to:
VSA Modulator-Control Unit Connector for Inputs and Outputs (2014 2015), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2016), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 PCM connector A (51P) No. 9 - Refer to:
PCM Connector for Inputs and Outputs (2014 2015), or
PCM Connector for Inputs and Outputs (2016), or
PCM Connector for Inputs and Outputs (2017 2018 2019 2020)Test circuit 2 Test point 1 VSA modulator-control unit 38P connector No. 26 - Refer to:
VSA Modulator-Control Unit Connector for Inputs and Outputs (2014 2015), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2016), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 PCM connector A (51P) No. 10 - Refer to:
PCM Connector for Inputs and Outputs (2014 2015), or
PCM Connector for Inputs and Outputs (2016), or
PCM Connector for Inputs and Outputs (2017 2018 2019 2020)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 38P connector. 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.