DTC U0146
DTC U0146 : F-CAN Malfunction (Powertrain Control Module (PCM)-CAN Gateway)
NOTE: Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems .
| DTC Description | Confirmed DTC | Pending DTC |
|---|---|---|
| U0146 F-CAN Malfunction (Powertrain Control Module (PCM)-CAN Gateway) |
DTC (PGM-FI)
- CAN gateway system DTC check
- 1. Check for CAN gateway system DTCs with the HDS.
DTC Description DTC DTC (CAN Gateway)
Are any DTCs indicated?
YES
Go to the troubleshooting for CAN gateway DTC (s). .
NO
Go to step 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?
PCM (Bus A) is Not Available
Go to step 3.
PCM is Detected
Intermittent failure, the system is OK at this time.
Check for poor connections or loose terminals at the CAN gateway and the PCM.
If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot - Refer to: How to Troubleshoot the Fuel and Emissions Systems .
- Open wire check (F-CAN A_H line, F-CAN A_L line)
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Jump the SCS line with the HDS, and wait more than 1 minute.
- 3. Disconnect the following connectors.
CAN gateway 16P connector PCM connector A (51P) (6-Speed A/T) PCM connector A (50P) (9-Speed A/T) - 4. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 16P connector: disconnected PCM connector A (51P) (6-Speed A/T): disconnected PCM connector A (50P) (9-Speed A/T): disconnected 6-speed A/T
Test point 1 CAN gateway 16P connector (female terminals) No. 3: Test point 2 PCM connector A (51P) No. 9 - Refer to:
PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), or
PCM Connector for Inputs and Outputs (6-Speed A/T), or
PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018)Test point 1 CAN gateway 16P connector (female terminals) No. 11: Test point 2 PCM connector A (51P) No. 10 - Refer to:
PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), or
PCM Connector for Inputs and Outputs (6-Speed A/T), or
PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018)9-speed A/T
Test point 1 CAN gateway 16P connector (female terminals) No. 3: Test point 2 PCM connector A (50P) No. 11 - Refer to:
PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018), or
PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), or
PCM Connector for Inputs and Outputs (6-Speed A/T)Test point 1 CAN gateway 16P connector (female terminals) No. 11: Test point 2 PCM connector A (50P) No. 10 - Refer to:
PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018), or
PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), or
PCM Connector for Inputs and Outputs (6-Speed A/T)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 PCM.
Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. - Refer to: PCM Removal and Installation (6-Speed A/T), ('16-'18 9-Speed A/T), or PCM Removal and Installation (9-Speed A/T) (2019 2020 2021)
If DTC U0146 goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (9-Speed A/T) (2019 2020 2021), or PCM Removal and Installation (6-Speed A/T), ('16-'18 9-Speed A/T) .
NO
Repair an open in the wire between the PCM (A9, A10 or A10, A11) and the CAN gateway.