DTC U0029-00, U0047-00 (Electric Servo Brake Control Unit)

WARNING: This page is about a different variant/trim than selected.

DTC U0029-00 : F-CAN Malfunction (BUS-OFF)

DTC U0047-00 : F-CAN Malfunction (Ch2 Bus-OFF)/Vehicle Communication Bus C Performance

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

DTC Description	DTC	Freeze Frame
U0029-00 F-CAN Malfunction (BUS-OFF)
U0047-00 F-CAN Malfunction (Ch2 Bus-OFF)/Vehicle Communication Bus C Performance

DTC (Electric servo brake)

Problem verification

-1. Turn the vehicle to the ON mode.

-2. Clear the DTCs with the HDS.

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

-4. Check for DTCs with the HDS.

DTC Description	DTC	Freeze Frame
U0029-00 F-CAN Malfunction (BUS-OFF)
U0047-00 F-CAN Malfunction (Ch2 Bus-OFF)/Vehicle Communication Bus C Performance

Is DTC U0029-00 or U0047-00 indicated?

YES

The failure is duplicated. Go to step 2.

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.

DTC check (CAN gateway system)

-1. Check for CAN gateway system DTCs with the HDS.

DTC Description	DTC

Are DTC(s) indicated?

YES

Go to indicated DTC's troubleshooting.

Go to step 3.

F-CAN circuit communication check
-1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.

F-CAN Bus Connected Unit Check

Which result is indicated?

Electric servo brake control unit (Bus B) is Not Available

Go to step 4.

Electric servo brake control unit (Bus C) is Not Available

Go to step 5.

Electric servo brake control unit (Bus B and C) is Available

Check for loose terminals and poor connections in the electric servo brake control unit 22P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the electric servo brake control unit/pedal feel simulator .

Open wire check (F-CAN B_H, F-CAN B_L lines)

-1. Turn the vehicle to the OFF (LOCK) mode.

-2. Disconnect the following connectors.

Electric servo brake control unit 22P connector

CAN gateway 16P connector

-3. Measure the resistance between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Electric servo brake control unit 22P connector: disconnected
	CAN gateway 16P connector: disconnected
Test circuit 1
Test point 1	Electric servo brake control unit 22P connector No. 15
Test point 2	CAN gateway 16P connector (female terminals) No. 6:

Test circuit 2
Test point 1	Electric servo brake control unit 22P connector No. 14
Test point 2	CAN gateway 16P connector (female terminals) No. 14:

Courtesy of HONDA, U.S.A., INC.

Is there 1.0 Ω or less?

YES

The F-CAN B_H and F-CAN B_L wires are OK. Check for loose terminals and poor connections in the electric servo brake control unit 22P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the electric servo brake control unit/pedal feel simulator .

Repair an open in the wire between the electric servo brake control unit and the CAN gateway.

Open wire check (F-CAN C_H, F-CAN C_L lines)