DTC U0122 (Gauge Control Module (With CAN Gateway)) (2019 2020)
DTC U0122 : Gauge control module lost communication with VSA modulator-control unit
| DTC Description | DTC |
|---|---|
| U0122 Gauge control module lost communication with VSA modulator-control unit |
DTC (Gauge Control Module)
Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information - Refer to:
How to Troubleshoot the Fuel and Emissions Systems (2014 2015 2016 2017 2018 2019 2020) or
- Problem verification
- 1. Clear the DTCs with the HDS.
- 2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.
- 3. Wait for at least 6 seconds.
- 4. Check for DTCs with the HDS.
DTC Description DTC U0122 Gauge control module lost communication with VSA modulator-control unit Is DTC U0122 indicated?
YES
Go to step 2.
NO
Intermittent failure, the system is OK at this time. Check for loose or poor connections.
- CAN gateway system DTC check
- 1. 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 troubleshooting for CAN gateway system DTC (s) .
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?
GAUGE CONTROL MODULE (Bus A) is Not Available
Go to step 4.
VSA MODULATOR-CONTROL UNIT (Bus A) is Not Available
Go to step 6.
VSA MODULATOR-CONTROL UNIT (Bus B) is Not Available
Go to step 8.
GAUGE CONTROL MODULE and VSA MODULATOR-CONTROL UNIT are Detected
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module, the CAN gateway, and the VSA modulator-control unit.
- Open wire check (F-CAN A_H line)
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connectors.
Gauge control module connector A (32P) CAN gateway 16P connector - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Gauge control module connector A (32P): disconnected CAN gateway 16P connector: disconnected Test point 1 Gauge control module connector A (32P) No. 27 - Refer to:
Gauge Control Module Input Test (2017 2018 2019 2020)Test point 2 CAN gateway 16P connector No. 3 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 gauge control module and the CAN gateway.
- Open wire check (F-CAN A_L line)
- 1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Gauge control module connector A (32P): disconnected CAN gateway 16P connector: disconnected Test point 1 Gauge control module connector A (32P) No. 28 - Refer to:
Gauge Control Module Input Test (2017 2018 2019 2020)Test point 2 CAN gateway 16P connector No. 11 Is there continuity?
YES
The F-CAN A_L wire is OK. Replace the gauge control module .
NO
Repair an open in the F-CAN A_L wire between the gauge control module and the CAN gateway.
- Open wire check (F-CAN A_H line)
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connectors.
VSA modulator-control unit 38P connector CAN gateway 16P connector - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode VSA modulator-control unit 38P connector: disconnected CAN gateway 16P connector: disconnected Test point 1 VSA modulator-control unit 38P connector No. 38 - Refer to:
VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 CAN gateway 16P connector No. 3 Is there continuity?
YES
The F-CAN A_H wire is OK. Go to step 7.
NO
Repair an open in the F-CAN A_H wire between the VSA modulator-control unit and the CAN gateway.
- Open wire check (F-CAN A_L line)
- 1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode VSA modulator-control unit 38P connector: disconnected CAN gateway 16P connector: disconnected Test point 1 VSA modulator-control unit 38P connector No. 26 - Refer to:
VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020),Test point 2 CAN gateway 16P connector No. 11 Is there continuity?
YES
The F-CAN A_L wire is OK. Replace the VSA modulator-control unit .
NO
Repair an open in the F-CAN A_L wire between the VSA modulator-control unit and the CAN gateway.
- Open wire check (F-CAN B_H line)
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connectors.
VSA modulator-control unit 38P connector CAN gateway 16P connector - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode VSA modulator-control unit 38P connector: disconnected CAN gateway 16P connector: disconnected Test point 1 VSA modulator-control unit 38P connector No. 31 - Refer to:
VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020),Test point 2 CAN gateway 16P connector No. 6 Is there continuity?
YES
The F-CAN B_H wire is OK. Go to step 9.
NO
Repair an open in the F-CAN B_H wire between the VSA modulator-control unit and the CAN gateway.
- Open wire check (F-CAN B_L line)
- 1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode VSA modulator-control unit 38P connector: disconnected CAN gateway 16P connector: disconnected Test point 1 VSA modulator-control unit 38P connector No. 20 - Refer to:
VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 CAN gateway 16P connector No. 14 Is there continuity?
YES
The F-CAN B_L wire is OK. Replace the VSA modulator-control unit .
NO
Repair an open in the F-CAN B_L wire between the VSA modulator-control unit and the CAN gateway.