Honda HR-V: DTC Troubleshooting U0029-00: F-CAN Malfunction (Bus-Off) (Electric Parking Brake Control Unit)

NOTE:

• Troubleshoot any PGM-FI DTCs first - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the CVT System (CVT).
• Before you troubleshoot, review the how to troubleshoot the electric parking brake system.
• This DTC is stored by communication failure between the F-CAN line and the electric parking brake 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.

1. DTC check:

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 to the ON mode.
4. Check for F-CAN circuit DTCs with the HDS.

Are any DTCs indicated?

YES

Go to the troubleshooting for F-CAN circuit troubleshooting.

NO

Intermittent failure, the system is OK at this time. 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.

DTC TROUBLESHOOTING U0100-00, U0101-00, U0122-00, U0151-00, U0155-00: F-CAN MALFUNCTION (ELECTRIC PARKING BRAKE CONTROL UNIT)

NOTE:

• Before you troubleshoot, review the general troubleshooting information.
• Refer to the DTC code shown on the display, and then inspect the connectors and terminals based on the instructions in the table below.
• The DTC may be stored due to loss of voltage supply or ground at the transmitting control unit. Verify voltage supply and ground are OK on the control unit related to the specific code before following this troubleshooting.

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.
4. Start the engine, and let it idle for at least 5 seconds.
5. Check for DTCs with the HDS.

Is any of DTC indicated?

YES

Go to step 2.

NO

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the transmitting control units, and electric parking brake control unit. 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.

2. Open wire check (F-CAN_H, F-CAN_L lines):

1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the following connector.

Electric parking brake control unit 30P connector

3. Disconnect the transmitting control unit connectors. (Refer to the DTC code shown on the display, and then disconnect the connector(s) based on the instructions in the table below.)

NOTE: Always short the SCS line with the HDS before removing PCM connector(s).

SCS Short

PCM connector A (51P)

VSA modulator-control unit 21P connector

SRS unit connector A (39P)

Gauge control module connector A (32P)

4. Check for continuity between the receiving control unit and the transmitting control unit on the F-CAN_H circuit and the F-CAN_L circuit as specified in the table while in the vehicle OFF mode.

Is there continuity?

YES

The F-CAN_H and F-CAN_L wires are OK at this time, replace the transmitting control unit. (Refer to the DTC code shown on the display, and then replace the control unit based on the instructions in the table below.)

NO

Repair an open in the F-CAN_H and/or F-CAN_L wires between the receiving control unit and the transmitting control unit.

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