EPS Symptom Troubleshooting Index(EPS Control Unit)

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	Symptom troubleshooting - Refer to: Network Communications Symptom Troubleshooting - HDS does not communicate with the vehicle () or Network Communications Symptom Troubleshooting - F-CAN Lost Communication (CAN BUS with Connection to CAN Gateway) () or Network Communications Symptom Troubleshooting - B-CAN Lost Communication () or Network Communications Symptom Troubleshooting - F-CAN Lost Communication (CAN BUS without Connection to CAN Gateway) () or Network Communications Symptom Troubleshooting - F-CAN BUS-OFF (CAN BUS without Connection to CAN Gateway) () .
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 (IF-CAN_H, IF-CAN_L). Between the EPS control unit and the CAN gateway (VF-CAN B_H, VF-CAN B_L). Check the EPS control unit power circuit (+B_EPS, IG1_VSA/ABS). Check the EPS control unit ground circuit (PGND). Do the gauge control module self-diagnostic function .	Refer to the followings about the indicator operating condition; How to Troubleshoot Information Refer to the followings about the circuit troubleshooting; Gauge control module connector for inputs and outputs EPS control unit connector for inputs and outputs 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

Symptom troubleshooting - Refer to: Network Communications Symptom Troubleshooting - HDS does not communicate with the vehicle () or Network Communications Symptom Troubleshooting - F-CAN Lost Communication (CAN BUS with Connection to CAN Gateway) () or Network Communications Symptom Troubleshooting - B-CAN Lost Communication () or Network Communications Symptom Troubleshooting - F-CAN Lost Communication (CAN BUS without Connection to CAN Gateway) () or Network Communications Symptom Troubleshooting - F-CAN BUS-OFF (CAN BUS without Connection to CAN Gateway) () .

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 (IF-CAN_H, IF-CAN_L).
- Between the EPS control unit and the CAN gateway (VF-CAN B_H, VF-CAN B_L).
Check the EPS control unit power circuit (+B_EPS, IG1_VSA/ABS).
Check the EPS control unit ground circuit (PGND).
Do the gauge control module self-diagnostic function .

Refer to the followings about the indicator operating condition;

How to Troubleshoot Information

Refer to the followings about the circuit troubleshooting;