DTC Troubleshooting: U0100-00, U0101-00, U0126-00, U0129-00, U0151-00, U0155-00(VSA Control Unit)

DTC U0100-00  : CAN Communication Failure with ECM/ISU DTC U0101-00  : CAN Communication Failure with PCM/TCM DTC U0126-00  : CAN Communication Failure with Absolute Steering Wheel Angle Sensor DTC U0129-00  : CAN Communication Failure with AHB/ESB/EBB DTC U0151-00  : CAN Communication Failure with SRS DTC U0155-00  : CAN Communication Failure with METER

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.
• These DTC(s) may be stored due to the power/ground circuit failure of the appropriate transmitting control unit or sensor. Before this troubleshooting, check the power/ground circuit of the appropriate transmitting control unit or sensor first.

DTC (VSA)

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 the READY TO DRIVE mode.

   -4. Test-drive the vehicle at 6 mph (10 km/h) or more.

   NOTE:  Drive the vehicle on the road, not on a lift.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC
   U0100-00 CAN Communication Failure with ECM/ISU
   U0101-00 CAN Communication Failure with PCM/TCM
   U0126-00 CAN Communication Failure with Absolute Steering Wheel Angle Sensor
   U0129-00 CAN Communication Failure with AHB/ESB/EBB

   DTC Description	DTC
   U0151-00 CAN Communication Failure with SRS
   U0155-00 CAN Communication Failure with METER

   Is DTC U0100-00, U0101-00, U0126-00, U0129-00, U0151-00, or U0155-00 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 .

2. CAN gateway system DTC check

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

   DTC Description	DTC

   Is DTC indicated?

   YES 

   Go to the troubleshooting for CAN gateway system DTC(s) .

   NO 

   Go to step 3.

3. F-CAN circuit communication check (Receiving control unit)

   -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

   Does the VSA modulator-control unit detect the CAN gateway Bus channels B and C?

   VSA modulator-control unit (Bus B) is Not Available

   Go to step 4.

   VSA modulator-control unit (Bus C) is Not Available

   Go to step 5.

   VSA modulator-control unit (Bus B and C) is Available

   Go to step 6.

4. 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.

   VSA modulator-control unit 46P connector

   CAN gateway 16P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	VSA modulator-control unit 46P connector: disconnected
   	CAN gateway 16P connector: disconnected
   Test circuit 1
   Test point 1	VSA modulator-control unit 46P connector No. 46
   Test point 2	CAN gateway 16P connector (female terminals) No. 6:

   Test circuit 2
   Test point 1	VSA modulator-control unit 46P connector No. 34

   Test point 2

   CAN gateway 16P connector (female terminals) No. 14:

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

   Is there continuity?

   YES 

   The F-CAN B_H and the F-CAN B_L wires are OK. Check for loose terminals and poor connections in the VSA modulator-control unit 46P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the VSA modulator-control unit .

   NO 

   Repair an open in the F-CAN B_H and/or the F-CAN B_L wires between the VSA modulator-control unit and the CAN gateway.

5. 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.

   VSA modulator-control unit 46P connector

   CAN gateway 16P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	VSA modulator-control unit 46P connector: disconnected
   	CAN gateway 16P connector: disconnected
   Test circuit 1
   Test point 1	VSA modulator-control unit 46P connector No. 40
   Test point 2	CAN gateway 16P connector (female terminals) No. 5:

   Test circuit 2
   Test point 1	VSA modulator-control unit 46P connector No. 28
   Test point 2	CAN gateway 16P connector (female terminals) No. 13:

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

   Is there continuity?

   YES 

   The F-CAN C_H and the F-CAN C_L wires are OK. Check for loose terminals and poor connections in the VSA modulator-control unit 46P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the VSA modulator-control unit .

   NO 

   Repair an open in the F-CAN C_H and/or the F-CAN C_L wires between the VSA modulator-control unit and the CAN gateway.

6. F-CAN circuit communication check (Transmitting control unit)

   -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

   According to the detected DTC on the following table, make sure that the transmitting control unit detects the CAN gateway Bus channel(s) normally.

   DTC	Transmitting control unit	Detected CAN gateway Bus channel(s) at normal
   U0100-00	PCM	B
   U0101-00	PCM	B
   U0126-00	EPS control unit	C
   U0129-00	Electric servo brake control unit	B, C
   U0151-00	SRS unit	C
   U0155-00	Gauge control module	B

   Is it detected normally?

   Detected normal

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the transmitting control unit and the CAN gateway.

   U0100-00: PCM (Bus B) is Not Available

   Go to step 7.

   U0101-00: PCM (Bus B) is Not Available

   Go to step 7.

   U0126-00: EPS control unit (Bus C) is Not Available

   Go to step 8.

   U0129-00: Electric servo brake control unit (Bus B) is Not Available

   Go to step 7.

   U0129-00: Electric servo brake control unit (Bus C) is Not Available

   Go to step 8.

   U0151-00: SRS unit (Bus C) is Not Available

   Go to step 8.

   U0155-00: Gauge control module (Bus B) is Not Available

   Go to step 7.

7. 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 according to the detected DTC.

   DTC	Connector
   -	CAN gateway 16P connector
   U0100-00	PCM Connector A (50P)
   U0101-00	PCM Connector A (50P)
   U0129-00	Electric servo brake control unit 22P connector
   U0155-00	Gauge control module connector A (32P)

   NOTE:  Before disconnecting the management ECU connector, jump the SCS line with the HDS, and wait for more than 1 minute.

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

   Test condition

   Vehicle OFF (LOCK) mode

   	Transmitting control unit connector(s) for indicated DTCs: disconnected
   	CAN gateway 16P connector: disconnected

   DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
   		Connector	Terminal	Connector	Terminal
   U0100-00	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	PCM Connector A (50P)	No. 39
   	F-CAN B_L		No. 14		No. 38
   U0101-00	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	PCM Connector A (50P)	No. 39
   	F-CAN B_L		No. 14		No. 38
   U0129-00	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	Electric servo brake control unit 22P connector	No. 15
   	F-CAN B_L		No. 14		No. 14
   U0155-00	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	Gauge control module connector A (32P)	No. 19
   	F-CAN B_L		No. 14		No. 20

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

   Is there continuity?

   YES 

   The F-CAN B_H and the F-CAN B_L wires are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. According to the detected DTC on the following table, replace the correspond control unit.

   DTC	Transmitting Control Unit
   U0100-00	PCM
   U0101-00	PCM
   U0129-00	Electric servo brake control unit
   U0155-00	Gauge control module

   NO 

   Repair an open in the F-CAN B_H and/or the F-CAN B_L wires between the receiving control unit and the transmitting control unit.

8. 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 according to the detected DTC.

   DTC	Connector
   -	CAN gateway 16P connector
   U0126-00	EPS Control Unit Connector B (6P)
   U0129-00	Electric servo brake control unit 22P connector
   U0151-00	SRS unit connector A (39P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Transmitting control unit connector(s) for indicated DTCs: disconnected
   	CAN gateway 16P connector: disconnected

   DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
   		Connector	Terminal	Connector	Terminal
   U0126-00	F-CAN C_H	CAN gateway 16P connector (female terminals):	No. 5	EPS Control Unit Connector B (6P)	No. 3
   	F-CAN C_L		No. 13		No. 1
   U0129-00	F-CAN C_H	CAN gateway 16P connector (female terminals):	No. 5	Electric servo brake control unit 22P connector	No. 19
   	F-CAN C_L		No. 13		No. 18
   U0151-00	F-CAN C_H	CAN gateway 16P connector (female terminals):	No. 5	SRS unit connector A (39P)	No. 34
   	F-CAN C_L		No. 13		No. 35

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

   Is there continuity?

   YES 

   The F-CAN C_H and the F-CAN C_L wires are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. According to the detected DTC on the following table, replace the correspond control unit.

   DTC	Transmitting Control Unit
   U0126-00	EPS Control Unit
   U0129-00	Electric servo brake control unit
   U0151-00	SRS unit

   NO 

   Repair an open in the F-CAN C_H and/or the F-CAN C_L wires between the receiving control unit and the transmitting control unit.