DTC U0029-00 (EPS Control Unit)

DTC U0029-00  : F-CAN Malfunction (Bus-Off)

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

DTC (EPS)

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 to the READY TO DRIVE mode.

   -4. Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame
   U0029-00 F-CAN Malfunction (Bus-Off)

   Is DTC U0029-00 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   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.

2. 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.

   NO 

   Go to step 3.

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?

   EPS control unit (Bus C) is Not Available

   Go to step 4.

   EPS control unit (Bus C) is Available

   Check for loose terminals and poor connections at the EPS control unit connectors. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good EPS motor/control unit , then recheck. If the symptom/indication goes away with a known-good EPS motor/control unit, replace the original EPS motor/control unit .

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

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

   -2. Disconnect the following connectors.

   EPS control unit connector B (6P)

   CAN gateway 16P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	EPS control unit connector B (6P): disconnected
   	CAN gateway 16P connector: disconnected
   Test circuit 1
   Test point 1	EPS control unit connector B (6P) No. 1
   Test point 2	CAN gateway 16P connector (female terminals) No. 5:

   Test circuit 2
   Test point 1	EPS control unit connector B (6P) No. 3
   Test point 2	CAN gateway 16P connector (female terminals) No. 13:

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

   Is there 1.0 Ω or less?

   YES 

   The F-CAN C_H and F-CAN C_L wires are OK. Check for loose terminals and poor connections at the EPS control unit connectors. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good EPS motor/control unit , then recheck. If the symptom/indication goes away with a known-good EPS motor/control unit, replace the original EPS motor/control unit .

   NO 

   Repair an open in the wire between the EPS control unit and the CAN gateway.