DTC U0126 (A/T System (With CAN Gateway)) (2016 2017 2018)
DTC U0126 : Lost Communication With Steering Angle Sensor
- Before you troubleshoot, record all freeze data and any on-board snapshots, and 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 TCM.
| DTC Description | Confirmed DTC | Pending DTC | Freeze Frame |
|---|---|---|---|
| U0126 Lost Communication With Steering Angle Sensor |
DTC (A/T)
- Problem verification
- 1. Turn the vehicle to the ON mode.
- 2. Clear the DTC with the HDS.
- 3. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC Freeze Frame U0126 Lost Communication With Steering Angle Sensor Is DTC U0126 indicated?
YES
The failure is duplicated. Go to step 2.
NO
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the VSA modulator-control unit, the CAN gateway, and the PCM. 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.
- 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 .
NO
Go to step 3.
- 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?
TCM (Bus A) is Not Available
Go to step 4.
TCM (Bus B) is Not Available
Go to step 6.
STEERING ANGLE SENSOR is Not Available
Go to step 8.
TCM 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 TCM.
- Open wire check (F-CAN A_H line)
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connectors.
CAN gateway 24P connector TCM 58P connector - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 24P connector: disconnected TCM 58P connector: disconnected Test point 1 CAN gateway 24P connector No. 14 Test point 2 TCM 58P connector No. 34 Is there continuity?
YES
The F-CAN A_H wire is OK. Go to step 5.
NO
Repair an open in the F-CAN A_H wire between the CAN gateway and the TCM.
- 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 24P connector: disconnected TCM 58P connector: disconnected Test point 1 CAN gateway 24P connector No. 15 Test point 2 TCM 58P connector No. 47 Is there continuity?
YES
The F-CAN A_L wire is OK. Update the TCM if it does not have the latest software , or substitute a known-good TCM , then recheck. If this DTC goes away and the TCM was updated, troubleshooting is complete. If this DTC goes away and the TCM was substituted, replace the original TCM .
NO
Repair an open in the F-CAN A_L wire between the CAN gateway and the TCM.
- Open wire check (F-CAN B_H line)
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connectors.
CAN gateway 24P connector TCM 58P connector - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 24P connector: disconnected TCM 58P connector: disconnected Test point 1 CAN gateway 24P connector No. 11 Test point 2 TCM 58P connector No. 7 Is there continuity?
YES
The F-CAN B_H wire is OK. Go to step 7.
NO
Repair an open in the F-CAN B_H wire between the CAN gateway and the TCM.
- Open wire check (F-CAN B_L line)
- 1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 24P connector: disconnected TCM 58P connector: disconnected Test point 1 CAN gateway 24P connector No. 10 Test point 2 TCM 58P connector No. 20 Is there continuity?
YES
The F-CAN B_L wire is OK. Update the TCM if it does not have the latest software , or substitute a known-good TCM , then recheck. If this DTC goes away and the TCM was updated, troubleshooting is complete. If this DTC goes away and the TCM was substituted, replace the original TCM .
NO
Repair an open in the F-CAN B_L wire between the CAN gateway and the TCM.
- Open wire check (F-CAN A_H line)
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connectors.
CAN gateway 24P connector Steering angle sensor 4P connector - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 24P connector: disconnected Steering angle sensor 4P connector: disconnected Test point 1 CAN gateway 24P connector No. 14 Test point 2 Steering angle sensor 4P connector No. 2 Is there continuity?
YES
The F-CAN A_H wire is OK. Go to step 9.
NO
Repair an open in the F-CAN A_H wire between the CAN gateway and the steering angle sensor.
- 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 24P connector: disconnected Steering angle sensor 4P connector: disconnected Test point 1 CAN gateway 24P connector No. 15 Test point 2 Steering angle sensor 4P connector No. 3 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.