DTC Troubleshooting: U0047-00 (CAN Gateway) - Honda CR-V RW/RT 2017-2020

1.

Problem verification:

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
U0047-00 CAN Gateway F-CAN ch B Bus Off

Is DTC U0047-00 indicated?


	YES

Go to step 2.


	NO

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

2.

Shorted unit check (PCM):

Shorted unit check (PCM)

?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 connector.

PCM connector A (50P)

?4.	Exit the SCS mode with the HDS.

?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
U0047-00 CAN Gateway F-CAN ch B Bus Off

Is DTC U0047-00 indicated?


	YES

Go to step 3.


	NO

Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM.?

3.

Shorted unit check (VSA modulator-control unit):

Shorted unit check (VSA modulator-control unit)

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

?2.

Disconnect the following connector.

VSA modulator-control unit 46P 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
U0047-00 CAN Gateway F-CAN ch B Bus Off

Is DTC U0047-00 indicated?


	YES

Go to step 4.


	NO

Replace the VSA modulator-control unit.?

4.

Shorted unit check (ANC/active sound control unit):

Shorted unit check (ANC/active sound control unit)

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

?2.

Disconnect the following connector.

ANC/active sound control unit 20P 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
U0047-00 CAN Gateway F-CAN ch B Bus Off

Is DTC U0047-00 indicated?


	YES

Go to step 5.


	NO

Substitute a known-good ANC/active sound control unit.?

5.

Shorted unit check (audio-navigation unit^*1 audio unit^*2):

Shorted unit check (audio-navigation unit^*1 audio unit^*2)

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

?2.

Disconnect the following connector.

Audio-navigation unit^*1 Audio unit ^*2connector E (16P)

?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
U0047-00 CAN Gateway F-CAN ch B Bus Off

Is DTC U0047-00 indicated?


	YES

Go to step 6.


	NO

Substitute a known-good audio unit.?

6.

Shorted unit check (SRS unit):

Shorted unit check (SRS unit)

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

?2.

Disconnect the following connector.

SRS unit connector A (39P)

?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
U0047-00 CAN Gateway F-CAN ch B Bus Off

Is DTC U0047-00 indicated?


	YES

Go to step 7.


	NO

Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good SRS unit.?

7.

Shorted unit check (EPS control unit):

Shorted unit check (EPS control unit)

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

?2.

Disconnect the following connector.

EPS control unit connector B (6P)

?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
U0047-00 CAN Gateway F-CAN ch B Bus Off

Is DTC U0047-00 indicated?


	YES

Go to step 8.


	NO

Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good EPS control unit.?

8.

Shorted unit check (electric brake booster):

Shorted unit check (electric brake booster)

?1.	Turn the vehicle to the OFF (LOCK) mode with driver's door open, then wait 3 minutes. NOTE: Do not close the driver's door.

?2.

Disconnect the following connector.

Electric brake booster 26P 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
U0047-00 CAN Gateway F-CAN ch B Bus Off

Is DTC U0047-00 indicated?


	YES

Go to step 9.


	NO

Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or replace the electric brake booster.?

9.

Shorted unit check (real time AWD control unit):

Shorted unit check (real time AWD control unit)

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

?2.

Disconnect the following connector.

Real time AWD control unit 24P 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
U0047-00 CAN Gateway F-CAN ch B Bus Off

Is DTC U0047-00 indicated?


	YES

Go to step 10.


	NO

Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good real time AWD control unit.?

10.

Shorted unit check (multipurpose camera unit):

Shorted unit check (multipurpose camera unit)

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

?2.

Disconnect the following connector.

Multipurpose camera unit 12P 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
U0047-00 CAN Gateway F-CAN ch B Bus Off

Is DTC U0047-00 indicated?


	YES

Go to step 11.


	NO

Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good multipurpose camera unit.?

11.

Shorted unit check (millimeter wave radar):

Shorted unit check (millimeter wave radar)

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

?2.

Disconnect the following connector.

Millimeter wave radar 8P 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
U0047-00 CAN Gateway F-CAN ch B Bus Off

Is DTC U0047-00 indicated?


	YES

Go to step 12.


	NO

Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good millimeter wave radar.?

12.

Shorted wire check (F-CAN B_H line):

Shorted wire check (F-CAN B_H line)

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

?2.

Disconnect the following connector.

CAN gateway 12P connector

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected
	VSA modulator-control unit 46P connector: disconnected
	ANC/active sound control unit 20P connector: disconnected
	Audio-navigation unit^1 Audio unit^2 connector E (16P): disconnected
	SRS unit connector A (39P): disconnected
	EPS control unit connector B (6P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector: disconnected
	Multipurpose camera unit 12P connector: disconnected
	Millimeter wave radar 8P connector: disconnected
Test point 1	CAN gateway 12P connector (female terminal) No. 12:
Test point 2	Body ground

Is there continuity?


	YES

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


	NO

Go to step 13.

13.

Shorted wire check (F-CAN B_L line):

Shorted wire check (F-CAN B_L line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected
	VSA modulator-control unit 46P connector: disconnected
	ANC/active sound control unit 20P connector: disconnected
	Audio-navigation unit^1 Audio unit^2 connector E (16P): disconnected
	SRS unit connector A (39P): disconnected
	EPS control unit connector B (6P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector: disconnected
	Multipurpose camera unit 12P connector: disconnected
	Millimeter wave radar 8P connector: disconnected
	CAN gateway 12P connector: disconnected
Test point 1	CAN gateway 12P connector (female terminal) No. 5:
Test point 2	Body ground

Is there continuity?


	YES

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


	NO

Go to step 14.

14.

Shorted wire check (F-CAN B_H line to F-CAN B_L line):

Shorted wire check (F-CAN B_H line to F-CAN B_L line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector A (50P): disconnected
	VSA modulator-control unit 46P connector: disconnected
	ANC/active sound control unit 20P connector: disconnected
	Audio-navigation unit^1 Audio unit^2 connector E (16P): disconnected
	SRS unit connector A (39P): disconnected
	EPS control unit connector B (6P): disconnected
	Electric brake booster 26P connector: disconnected
	Real time AWD control unit 24P connector: disconnected
	Multipurpose camera unit 12P connector: disconnected
	Millimeter wave radar 8P connector: disconnected
	CAN gateway 12P connector: disconnected
Test point 1	CAN gateway 12P connector (female terminal) No. 5:
Test point 2	CAN gateway 12P connector (female terminal) No. 12:

Is there continuity?


	YES

Repair a short in the F-CAN B_H wire to the F-CAN B_L wire between CAN gateway terminals No. 5 and No. 12.?


	NO

Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good real time CAN gateway.?