Substitute a know-good EPS control unit, and connect the all disconnected connectors. Start the engine. Does the EPS indicator come on? YES - Go to step 13. NO - Check for loose EPS control unit connectors. If necessary, replace the EPS control unit and retest. Stop the engine, and verify the DTC. Is DTC16 indicated? YES - Check for loose torque sensor connectors. If necessary, substitute a known-good steering gearbox and recheck. NO - Perform the appropriate troubleshooting for the code indicated

DTC 17: Torque Sensor Vcc1 DTC 18: Torque Sensor Vcc2 Clear the DTC. Start the engine. Wait at least 10 seconds. Does the EPS indicator come on? YES - Go to step 4. NO - The system is OK at this time. Stop the engine, and verify the DTC. Is DTC17 or DTC18 indicated? YES - Go to step 5. NO - The system is OK at this time. Make sure the ignition switch is OFF, then disconnect the EPS control unit connector C (20P) and torque sensor 6P connector. Check for continuity between the EPS control unit connector C (20P) terminal No. 3 and body ground. EPS CONTROL UNIT CONNECTOR C (20) Wire side of female terminals Is there continuity? YES - Repair short to body ground in the wire between the torque sensor and EPS control unit. NO - Go to step 7.