DTC U0029-00 (CAN Gateway) (2014 2015)

DTC U0029-00  : CAN Gateway F-CAN ch A Bus Off

NOTE:  Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information .

DTC (CAN gateway)

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. Turn the vehicle to the ON mode, and wait 6 seconds.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time.

2. Shorted unit check (PCM)

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

   -2. Jump the SCS line with the HDS.

   -3. Disconnect the following connector.

   PCM connector A (51P)

   -4. Turn the vehicle to the ON mode.

   -5. Clear the DTC with the HDS.

   -6. Turn the vehicle to the OFF (LOCK) mode.

   -7. Turn the vehicle to the ON mode, and wait 6 seconds.

   -8. Check for DTCs with the HDS.

   DTC Description	DTC
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 indicated?

   YES 

   Go to step 3.

   NO 

   Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC U0029-00 goes away and the PCM was updated, troubleshooting is complete. If DTC U0029-00 goes away and the PCM was substituted, replace the original PCM .

3. Shorted unit check (engine mount control unit)

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

   -2. Disconnect the following connector.

   Engine mount control unit 16P connector

   -3. Turn the vehicle to the ON mode.

   -4. Clear the DTC with the HDS.

   -5. Turn the vehicle to the OFF (LOCK) mode.

   -6. Turn the vehicle to the ON mode, and wait 6 seconds.

   -7. Check for DTCs with the HDS.

   DTC Description	DTC
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 indicated?

   YES (with ACC)

   Go to step 4.

   YES (without ACC)

   Go to step 5.

   NO 

   Substitute a known-good engine mount control unit , then recheck. If DTC U0029-00 goes away and the engine mount control unit was substituted, replace the original engine mount control unit .

4. Shorted unit check (E-pretensioner unit)

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

   -2. Do the battery terminal disconnection procedure , then wait at least 3 minutes.

   -3. Disconnect the following connectors.

   E-pretensioner unit connector A (16P)

   E-pretensioner unit connector B (14P)

   -4. Do the battery terminal reconnection procedure .

   -5. Turn the vehicle to the ON mode.

   -6. Clear the DTC with the HDS.

   -7. Turn the vehicle to the OFF (LOCK) mode.

   -8. Turn the vehicle to the ON mode, and wait 6 seconds.

   -9. Check for DTCs with the HDS.

   DTC Description	DTC
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 indicated?

   YES 

   Go to step 5.

   NO 

   Update the E-pretensioner unit if it does not have the latest software, or substitute a known-good E-pretensioner unit , then recheck. If DTC U0029-00 goes away and the E-pretensioner unit was updated, troubleshooting is complete. If DTC U0029-00 goes away and the E-pretensioner unit was substituted, replace the original E-pretensioner unit .

5. Shorted unit check (gauge control module)

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

   -2. Disconnect the following connector.

   Gauge control module connector A (32P)

   -3. Turn the vehicle to the ON mode.

   -4. Clear the DTC with the HDS.

   -5. Turn the vehicle to the OFF (LOCK) mode.

   -6. Turn the vehicle to the ON mode, and wait 6 seconds.

   -7. Check for DTCs with the HDS.

   DTC Description	DTC
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 indicated?

   YES 

   Go to step 6.

   NO 

   Substitute a known-good gauge control module , then recheck. If DTC U0029-00 goes away and the gauge control module was substituted, replace the original gauge control module .

6. Shorted unit check (SRS unit)

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

   -2. Do the battery terminal disconnection procedure , then wait at least 3 minutes.

   -3. Disconnect the following connector.

   SRS unit connector A (39P)

   -4. Do the battery terminal reconnection procedure .

   -5. Turn the vehicle to the ON mode.

   -6. Clear the DTC with the HDS.

   -7. Turn the vehicle to the OFF (LOCK) mode.

   -8. Turn the vehicle to the ON mode, and wait 6 seconds.

   -9. Check for DTCs with the HDS.

   DTC Description	DTC
   U0029-00 CAN Gateway F-CAN ch A Bus Off

   Is DTC U0029-00 indicated?

   YES 

   Go to step 7.

   NO 

   Update the SRS unit if it does not have the latest software, or substitute a known-good SRS unit , then recheck. If DTC U0029-00 goes away and the SRS unit was updated, troubleshooting is complete. If DTC U0029-00 goes away and the SRS unit was substituted, replace the original SRS unit .

7. Shorted wire check (F-CAN A_H line)

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

   -2. Disconnect the following connector.

   CAN gateway 24P connector

   -3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (51P): disconnected
   	Engine mount control unit 16P connector: disconnected
   	E-pretensioner unit connector A (16P) (with ACC): disconnected
   	E-pretensioner unit connector B (14P) (with ACC): disconnected
   	Gauge control module connector A (32P): disconnected
   	SRS unit connector A (39P): disconnected
   	CAN gateway 24P connector: disconnected
   Test circuit	F-CAN A_H
   Test point 1	CAN gateway 24P connector No. 14 (BLU)
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair a short in the F-CAN A_H wire between the CAN gateway and the connected units.

   NO 

   The F-CAN A_H wire is not short to ground. Go to step 8.

8. Shorted wire check (F-CAN A_L line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (51P): disconnected
   	Engine mount control unit 16P connector: disconnected
   	E-pretensioner unit connector A (16P) (with ACC): disconnected
   	E-pretensioner unit connector B (14P) (with ACC): disconnected
   	Gauge control module connector A (32P): disconnected
   	SRS unit connector A (39P): disconnected
   	CAN gateway 24P connector: disconnected
   Test circuit	F-CAN A_L
   Test point 1	CAN gateway 24P connector No. 15 (PNK)
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair a short in the F-CAN A_L wire between the CAN gateway and the connected units.

   NO 

   The F-CAN A_L wire is not short to ground. Go to step 9.

9. Shorted wire check (F-CAN A_H line to F-CAN A_L line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (51P): disconnected
   	Engine mount control unit 16P connector: disconnected
   	E-pretensioner unit connector A (16P) (with ACC): disconnected
   	E-pretensioner unit connector B (14P) (with ACC): disconnected
   	Gauge control module connector A (32P): disconnected
   	SRS unit connector A (39P): disconnected
   	CAN gateway 24P connector: disconnected
   Test circuit	F-CAN A_H, F-CAN A_L
   Test point 1	CAN gateway 24P connector No. 14 (BLU)
   Test point 2	CAN gateway 24P connector No. 15 (PNK)

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

   Is there continuity?

   YES 

   Repair a short in the F-CAN A_H wire to the F-CAN A_L wire between CAN gateway terminals No. 14 and No. 15.

   NO 

   Update the CAN gateway if it does not have the latest software, or substitute a known-good CAN gateway , then recheck. If DTC U0029-00 goes away and the CAN gateway was updated, troubleshooting is complete. If DTC U0029-00 goes away and the CAN gateway was substituted, replace the original CAN gateway .