DTC : U0126-00 (SH-AWD Control Unit) (2019 2020)

DTC U0126-00  : F-CAN Malfunction (Lost Communication with Steering Angle Sensor)

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the SH-AWD ® System (2016 2017 2018 2019 2020) .

DTCs (SH-AWD)

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
   U0029-00 CAN Gateway F-CAN ch A Bus Off
   U0047-00 CAN Gateway F-CAN ch B Bus Off
   U3000-49 CAN Gateway Internal Failure

   Is DTC U0029-00, U0047-00, and/or U3000-49 indicated?

   YES 

   Go to the indicated DTC's troubleshooting in the CAN gateway system - Refer to: SH-AWD ® System DTC Troubleshooting Index (2016 2017 2018 2019 2020) .

   NO 

   Go to step 2.

2. F-CAN circuit communication check

   - 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?

   SH-AWD CONTROL UNIT (Bus A) is Not Available

   Go to step 3.

   STEERING ANGLE SENSOR is Not Available

   Go to step 5.

   SH-AWD CONTROL UNIT and STEERING ANGLE SENSOR are Detected

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals between the steering angle sensor, the CAN gateway, and the SH-AWD control unit.

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

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

   - 2. Disconnect the following connectors.

   CAN gateway 16P connector

   SH-AWD control unit 24P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 16P connector: disconnected
   	SH-AWD control unit 24P connector: disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 3:
   Test point 2	SH-AWD control unit 24P connector No. 14 - Refer to: SH-AWD ® Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020) .

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

   Is there continuity?

   YES 

   The F-CAN A_H wire is OK. Go to step 4.

   NO 

   Repair an open in the F-CAN A_H wire between the CAN gateway and the SH-AWD control unit.

4. Open wire check (F-CAN A_L line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 16P connector: disconnected
   	SH-AWD control unit 24P connector: disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 11:
   Test point 2	SH-AWD control unit 24P connector No. 24 - Refer to: SH-AWD ® Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020) .

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

   Is there continuity?

   YES 

   The F-CAN A_L wire is OK. Update the SH-AWD control unit if it does not have the latest software - Refer to:

   SH-AWD ® Control Unit Update (SH-AWD) (2016 2017 2018 2019 2020) ,

   or substitute a known-good SH-AWD control unit - Refer to:

   SH-AWD ® Control Unit Removal and Installation (2016 2017 2018 2019 2020)

   then recheck. If this DTC goes away and the SH-AWD control unit was updated, troubleshooting is complete.

   If this DTC goes away and the SH-AWD control unit was substituted, replace the original SH-AWD control unit - Refer to:

   SH-AWD ® Control Unit Removal and Installation (2016 2017 2018 2019 2020)

   NO 

   Repair an open in the F-CAN A_L wire between the CAN gateway and the SH-AWD control unit.

5. Open wire check (F-CAN A_H line)

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

   - 2. Disconnect the following connectors.

   CAN gateway 16P connector

   Steering angle sensor 4P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 16P connector: disconnected
   	Steering angle sensor 4P connector: disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 3:
   Test point 2	Steering angle sensor 4P connector (female terminals) No. 2:

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

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

   Is there continuity?

   YES 

   The F-CAN A_H wire is OK. Go to step 6.

   NO 

   Repair an open in the F-CAN A_H wire between the CAN gateway and the steering angle sensor.

6. Open wire check (F-CAN A_L line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 16P connector: disconnected
   	Steering angle sensor 4P connector: disconnected
   Test point 1	CAN gateway 16P connector (female terminals) No. 11:
   Test point 2	Steering angle sensor 4P connector (female terminals) No. 3:

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

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

   Is there continuity?

   YES 

   The F-CAN A_L wire is OK. Substitute a known-good steering angle sensor , then recheck. If this DTC goes away and the steering angle sensor was substituted, replace the original steering angle sensor .

   NO 

   Repair an open in the F-CAN A_L wire between the CAN gateway and the steering angle sensor.