DTC U0151 (A/T System (With CAN Gateway)) (2019 2020)
DTC U0151 : Lost Communication with SRS
- 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 |
|---|---|---|---|
| U0151 Lost Communication with SRS |
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 U0151 Lost Communication with SRS Is DTC U0151 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 - Refer to: Fuel and Emissions Systems DTC Troubleshooting Index (2019 2020) or Communication Systems DTC Troubleshooting Index .
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.
SRS UNIT is Not Available
Go to step 8.
TCM and SRS UNIT are Detected
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals between the SRS unit, 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 16P connector TCM 58P connector - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected TCM 58P connector: disconnected Test point 1 CAN gateway 16P connector (female terminals) No. 3: 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 16P connector: disconnected TCM 58P connector: disconnected Test point 1 CAN gateway 16P connector (female terminals) No. 11: Test point 2 TCM 58P connector No. 47 Is there continuity?
YES
The F-CAN A_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the TCM, 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 16P connector TCM 58P connector - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected TCM 58P connector: disconnected Test point 1 CAN gateway 16P connector (female terminals) No. 6: 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 16P connector: disconnected TCM 58P connector: disconnected Test point 1 CAN gateway 16P connector (female terminals) No. 14: Test point 2 TCM 58P connector No. 20 Is there continuity?
YES
The F-CAN B_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the TCM, 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 16P connector SRS unit connector A (39P) NOTE:Before disconnecting SRS unit connector A (39P), do the 12 volt battery terminal disconnection procedure - Refer to: 12 Volt Battery Sensor Removal and Installation (2016 2017 2018 2019 2020) and wait for at least 3 minutes.
- 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected SRS unit connector A (39P): disconnected Test point 1 CAN gateway 16P connector (female terminals) No. 3: Test point 2 SRS unit connector A (39P) No. 34 - Refer to:
SRS Unit Connector for Inputs and Outputs (2017 2018 2019 2020),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 SRS unit.
- 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 SRS unit connector A (39P): disconnected Test point 1 CAN gateway 16P connector (female terminals) No. 11: Test point 2 SRS unit connector A (39P) No. 35 - Refer to:
SRS Unit Connector for Inputs and Outputs (2017 2018 2019 2020), .Is there continuity?
YES
The F-CAN A_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the SRS unit, replace the original SRS unit - Refer to: SRS Unit Removal and Installation (2017 2018 2019 2020), .
NO
Repair an open in the F-CAN A_L wire between the CAN gateway and the SRS unit.