DTC 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 .
• According to the detected DTC(s), confirm the control unit that the VSA modulator-control unit lost communication with has the proper power supply and ground connection. Refer to the input testing for that control unit if necessary.

DTC (VSA)

1. DTC check (VSA modulator-control unit)

   -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. 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
   U0151-00 CAN Communication Failure with SRS

   DTC Description	DTC
   U0155-00 CAN Communication Failure with Meter

   Is DTC indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting .

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 (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

   Which result is indicated?

   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. Measure the resistance 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. 6:

   Test circuit 2
   Test point 1	VSA modulator-control unit 46P connector No. 28
   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 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 wire 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. Measure the resistance 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. 5:

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

   -2. 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	A, B
   U0101-00	PCM	A, 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	D

   Is it detected normally?

   Detected normal

   Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting .

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

   Go to step 7.

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

   Go to step 8.

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

   Go to step 7.

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

   Go to step 8.

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

   Go to step 9.

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

   Go to step 8.

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

   Go to step 9.

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

   Go to step 9.

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

   Go to step 10.

7. Open wire check (F-CAN A_H, F-CAN A_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)

   NOTE:  Jump the SCS line with the HDS, and wait more than 1 minute when disconnecting the PCM connector.

   SCS Short

   -3. Measure the resistance 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 A_H	CAN gateway 16P connector (female terminals):	No. 3	PCM connector A (50P)	No. 37
   	F-CAN A_L		No. 11		No. 36
   U0101-00	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	PCM connector A (50P)	No. 37
   	F-CAN A_L		No. 11		No. 36

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

   Is there 1.0 Ω or less?

   YES 

   The F-CAN A_H and F-CAN A_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

   NO 

   Repair an open in the wire between the receiving control unit and the transmitting control unit.

8. 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

   NOTE:  Jump the SCS line with the HDS, and wait more than 1 minute when disconnecting the PCM connector.

   SCS Short

   -3. Measure the resistance 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

   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 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/pedal feel simulator

   NO 

   Repair an open in the wire between the receiving control unit and the transmitting control unit.

9. 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)

   NOTE:  Before disconnecting the SRS unit connector, do the 12 volt battery terminal disconnection procedure and wait for at least 3 minutes.

   -3. Measure the resistance 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. 1
   	F-CAN C_L		No. 13		No. 3
   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 1.0 Ω or less?

   YES 

   The F-CAN C_H and 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 motor/control unit
   U0129-00	Electric servo brake control unit/pedal feel simulator
   U0151-00	SRS unit

   NO 

   Repair an open in the wire between the receiving control unit and the transmitting control unit.

10. Open wire check (F-CAN D_H, F-CAN D_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
    U0155-00	Gauge control module connector A (32P)

    -3. Measure the resistance 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
    U0155-00	F-CAN D_H	CAN gateway 16P connector (female terminals):	No. 7	Gauge control module connector A (32P)	No. 19
    	F-CAN D_L		No. 15		No. 20

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

    Is there 1.0 Ω or less?

    YES 

    The F-CAN D_H and F-CAN D_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
    U0155-00	Gauge control module

    NO 

    Repair an open in the wire between the receiving control unit and the transmitting control unit.