EPS Symptom Troubleshooting Index

When the vehicle has one of these symptoms, check for a diagnostic trouble code (DTC) with the HDS. If there is no DTC, do the diagnostic procedure for the symptom, in the sequence listed, until you find the cause.

Symptom	Diagnostic Procedure	Also check for
HDS does not communicate with the EPS control unit or the vehicle	Troubleshoot the DLC circuit - Refer to: DLC Circuit Troubleshooting (2019 - 2021) or DLC Circuit Troubleshooting (2022 - 2023) .	Faulty data link cable
EPS indicator does not come on	Do the gauge control module self-diagnostic function .
EPS indicator does not go off	NOTE: If any of the CAN communication failure DTC is indicated in other system, troubleshoot the DTC first. Check for open wire or short wire in the F-CAN circuit; Between the gauge control module and the CAN gateway (F-CAN D_H, F-CAN D_L). Between the EPS control unit and the CAN gateway (F-CAN C_H, F-CAN C_L). Check the EPS control unit power circuit (+B_EPS(70A)/+B_EPS, IG1_VSA(VST)). Check the EPS control unit ground circuit (GND). Do the gauge control module self-diagnostic function .	Refer to the followings about the indicator operating condition; How to Troubleshoot the EPS Refer to the followings about the circuit troubleshooting; Gauge control module connector for inputs and outputs EPS control unit connector for inputs and outputs - Refer to: EPS Control Unit Connector for Inputs and Outputs (2022 - 2023) or EPS Control Unit Connector for Inputs and Outputs (2019 - 2021) EPS system circuit diagram - Refer to: EPS Circuit Diagram (2022 - 2023) or EPS Circuit Diagram (2019 - 2021) Fuse to components index Ground to components index

Symptom

Diagnostic Procedure

Also check for

HDS does not communicate with the EPS control unit or the vehicle

Troubleshoot the DLC circuit - Refer to: DLC Circuit Troubleshooting (2019 - 2021) or DLC Circuit Troubleshooting (2022 - 2023) .

Faulty data link cable

EPS indicator does not come on

Do the gauge control module self-diagnostic function .

EPS indicator does not go off

NOTE: If any of the CAN communication failure DTC is indicated in other system, troubleshoot the DTC first.

Check for open wire or short wire in the F-CAN circuit;
- Between the gauge control module and the CAN gateway (F-CAN D_H, F-CAN D_L).
- Between the EPS control unit and the CAN gateway (F-CAN C_H, F-CAN C_L).
Check the EPS control unit power circuit (+B_EPS(70A)/+B_EPS, IG1_VSA(VST)).
Check the EPS control unit ground circuit (GND).
Do the gauge control module self-diagnostic function .

Refer to the followings about the indicator operating condition;

How to Troubleshoot the EPS

Refer to the followings about the circuit troubleshooting;

Gauge control module connector for inputs and outputs
EPS control unit connector for inputs and outputs - Refer to: EPS Control Unit Connector for Inputs and Outputs (2022 - 2023) or EPS Control Unit Connector for Inputs and Outputs (2019 - 2021)
EPS system circuit diagram - Refer to: EPS Circuit Diagram (2022 - 2023) or EPS Circuit Diagram (2019 - 2021)
Fuse to components index
Ground to components index