DTC U0100-00, U0104-00, U0122-00, U0128-00 (Electric Brake Booster Control Unit: With ACC)

DTC U0100-00  : CAN Communication Failure With ECM/PCM DTC U0104-00  : CAN Communication Failure With Driving Support System Control Unit DTC U0122-00  : CAN Communication Failure With VSA DTC U0128-00  : CAN Communication Failure With Electric Parking Brake

NOTE: 

• Before you troubleshoot, review the general troubleshooting information .
• According to the detected DTC(s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the electric brake booster.

DTC (Electric brake booster)

1. DTC check

   -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 wait 5 seconds or more.

   NOTE:  Do not open and close the driver's door.

   -4. Turn the vehicle to the ON mode.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame
   U0100-00 CAN Communication Failure With ECM/PCM
   U0104-00 CAN Communication Failure With Driving Support System Control Unit
   U0122-00 CAN Communication Failure With VSA
   U0128-00 CAN Communication Failure With Electric Parking Brake

   Is DTC indicated?

   YES 

   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. CAN gateway system DTC check

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

   DTC Description	DTC

   DTC (CAN gateway)

   Is DTC 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?

   Electric brake booster (Bus A) is Not Available

   Go to step 4.

   Electric brake booster (Bus B) is Not Available

   Go to step  5.

   Electric brake booster (Bus A and B) is Available

   Go to step  6.

4. Open wire check (F-CAN A_H, F-CAN A_L lines)

   -1. Turn the vehicle to the OFF (LOCK) mode with driver's door open.

   -2. Wait for 3 minutes.

   NOTE:  Do not close the driver's door.

   -3. Disconnect the following connectors.

   Electric brake booster 26P connector

   CAN gateway 16P connector

   -4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Electric brake booster 26P connector: disconnected
   	CAN gateway 16P connector: disconnected
   Test point 1	Electric brake booster 26P connector No. 26
   Test point 2	CAN gateway 16P connector (female terminals) No. 3:

   Test point 1	Electric brake booster 26P connector No. 18
   Test point 2	CAN gateway 16P connector (female terminals) No. 11:

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

   Is there continuity?

   YES 

   The F-CAN A_H and F-CAN A_L wires are OK. Check for loose terminals and poor connections in the electric brake booster 26P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the electric brake booster .

   NO 

   Repair an open in the wire between the electric brake booster and the CAN gateway.

5. Open wire check (F-CAN B_H, F-CAN B_L lines)

   -1. Turn the vehicle to the OFF (LOCK) mode with driver's door open.

   -2. Wait for 3 minutes.

   NOTE:  Do not close the driver's door.

   -3. Disconnect the following connectors.

   Electric brake booster 26P connector

   CAN gateway 16P connector

   -4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Electric brake booster 26P connector: disconnected
   	CAN gateway 16P connector: disconnected
   Test point 1	Electric brake booster 26P connector No. 19
   Test point 2	CAN gateway 16P connector (female terminals) No. 6:

   Test point 1	Electric brake booster 26P connector No. 12
   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 F-CAN B_L wires are OK. Check for loose terminals and poor connections in the electric brake booster 26P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the electric brake booster .

   NO 

   Repair an open in the wire between the electric brake booster 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 *1	PCM	A, D
   U0100-00 *2	PCM	A, B
   U0104-00	Millimeter wave radar	D

   DTC	Transmitting control unit	Detected CAN gateway Bus channel(s) at normal
   U0122-00	VSA modulator-control unit	A, B
   U0128-00	VSA modulator-control unit	A, B

   *1: A/T*2: M/T, CVT

   Is it detected normally?

   Detected normal

   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.

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

   Go to step 7.

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

   Go to step  8.

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

   Go to step  9.

   U0104-00: Millimeter wave radar (Bus D) is Not Available

   Go to step  9.

   U0122-00: VSA modulator-control unit (Bus A) is Not Available

   Go to step 7.

   U0122-00: VSA modulator-control unit (Bus B) is Not Available

   Go to step  8.

   U0128-00: VSA modulator-control unit (Bus A) is Not Available

   Go to step 7.

   U0128-00: VSA modulator-control unit (Bus B) is Not Available

   Go to step  8.

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)
   U0122-00	VSA modulator-control unit 46P connector
   U0128-00	VSA modulator-control unit 46P connector

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

   -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 A_H	CAN gateway 16P connector (female terminals):	No. 3	PCM connector A (50P)	No. 37
   	F-CAN A_L		No. 11		No. 36
   U0122-00	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	VSA modulator-control unit 46P connector	No. 20
   	F-CAN A_L		No. 11		No. 21
   U0128-00	F-CAN A_H	CAN gateway 16P connector (female terminals):	No. 3	VSA modulator-control unit 46P connector	No. 20
   	F-CAN A_L		No. 11		No. 21

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

   Is there continuity?

   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, substitute or replace the correspond control unit.

   DTC	Transmitting Control Unit
   U0100-00	PCM
   U0122-00	VSA modulator-control unit
   U0128-00	VSA modulator-control unit

   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)
   U0122-00	VSA modulator-control unit 46P connector
   U0128-00	VSA modulator-control unit 46P connector

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

   -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
   U0122-00	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	VSA modulator-control unit 46P connector	No. 24
   	F-CAN B_L		No. 14		No. 25

   DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
   		Connector	Terminal	Connector	Terminal
   U0128-00	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	VSA modulator-control unit 46P connector	No. 24
   	F-CAN B_L		No. 14		No. 25

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

   Is there continuity?

   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, substitute or replace the correspond control unit.

   DTC	Transmitting Control Unit
   U0100-00	PCM
   U0122-00	VSA modulator-control unit
   U0128-00	VSA modulator-control unit

   NO 

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

9. 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
   U0100-00	PCM connector A (50P)
   U0104-00	Millimeter wave radar 8P connector

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

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

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

   DTC	Circuit Name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
   		Connector	Terminal	Connector	Terminal
   U0100-00	F-CAN D_H	CAN gateway 16P connector (female terminals):	No. 7	PCM connector A (50P)	No. 39
   	F-CAN D_L		No. 15		No. 38
   U0104-00	F-CAN D_H	CAN gateway 16P connector (female terminals):	No. 7	Millimeter wave radar 8P connector	No. 7
   	F-CAN D_L		No. 15		No. 6

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

   Is there continuity?

   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, substitute or replace the correspond control unit.

   DTC	Transmitting Control Unit
   U0100-00	PCM
   U0104-00	Millimeter wave radar

   NO 

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