DTC U0151 (CVT (TCM))

DTC U0151  : Lost Communication With SRS Unit

NOTE: 

• Before you troubleshoot, review the General Troubleshooting Information .
• This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
• Refer to the DTC shown on the display, then inspect the connectors and terminals based on the instructions.
• According to the detected DTC (s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the TCM.
• Before disconnecting the SRS unit connector, do the 12 volt battery terminal disconnection procedure , and wait for at least 3 minutes.

DTC (CVT)

1. CAN gateway system DTC check

   -1. Turn the vehicle to the ON mode.

   -2. Check for CAN gateway system DTCs with the HDS.

   DTC Description	DTC

   DTC (CAN gateway)

   Is any DTC indicated?

   YES 

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

   NO 

   Go to step 2.

2. 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 TCM detect the CAN gateway Bus channels A?

   Bus A is Not Available

   Go to step 3.

   Bus A is Available

   Go to step 4.

3. Open wire check (F-CAN A_H line, F-CAN A_L line)

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

   -2. Disconnect the following connectors.

   CAN gateway 16P connector

   TCM 50P connector

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

   F-CAN A_H line 

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 16P connector: disconnected
   	TCM 50P connector: disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 3:
   Test point 2	TCM 50P connector No. 3

   F-CAN A_L line 

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 16P connector: disconnected
   	TCM 50P connector: disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 11:
   Test point 2	TCM 50P connector No. 11

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

   Is there continuity?

   YES 

   The F-CAN A_H wire and the F-CAN A_L wire are OK. Check for poor connections or loose terminals at the CAN gateway and the TCM. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good TCM , then recheck. If this DTC goes away and the TCM was substituted, replace the original TCM .

   NO 

   Repair an open in the F-CAN A_H wire or the F-CAN A_L wire between the TCM and the CAN gateway.

4. 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
   U0151	SRS unit	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.

   U0151: SRS unit is Not Available for Bus B

   Go to step 5.

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

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

   -2. U0100: Jump the SCS line with the HDS, and wait more than 1 minute.

   -3. According to the detected DTC on the following table, disconnect the transmitting control unit connector (s).

   DTC	Connector
   -	CAN gateway 16P connector
   U0151	SRS unit connector A (43P)

   -4. 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
   U0151	F-CAN B_H	CAN gateway 16P connector (female terminals):	No. 6	SRS unit connector A (43P)	No. 16
   	F-CAN B_L		No. 14		No. 17

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

   Is there continuity?

   YES 

   The F-CAN B_H wire and the F-CAN B_L wire 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	Operation for transmitting control unit
   U0151	Check for poor connections or loose terminals at the CAN gateway and the SRS unit. Replace the SRS unit .

   NO 

   Repair an open in the F-CAN B_H wire or the F-CAN B_L wire between the transmitting control unit and the CAN gateway.