DTC U0155 (A/T System (With CAN Gateway)) (2019 2020)
DTC U0155 : F-CAN Malfunction (TCM-Gauge Control Module)
- 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 |
|---|---|---|---|
| U0155 F-CAN Malfunction (TCM-Gauge Control Module) |
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 U0155 F-CAN Malfunction (TCM-Gauge Control Module) Is DTC U0155 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.
GAUGE CONTROL MODULE is Not Available
Go to step 8.
TCM and GAUGE CONTROL MODULE are Detected
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals between the gauge control module, 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 Gauge control module 32P connector - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected Gauge control module 32P connector: disconnected Test point 1 CAN gateway 16P connector (female terminals) No. 3: Test point 2 Gauge control module 32P connector No. 27 - Refer to:
Gauge Control Module Input Test (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 gauge control module.
- 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 Gauge control module 32P connector: disconnected Test point 1 CAN gateway 16P connector (female terminals) No. 11: Test point 2 Gauge control module 32P connector No. 28 - Refer to:
Gauge Control Module Input Test (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 Gauge control module, replace the original gauge control module .
NO
Repair an open in the F-CAN A_L wire between the CAN gateway and the gauge control module.