Diagnostic Procedure

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?
1. YES: Go to Step 3.
2. NO: Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTICS TABLE ). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines
1. Erase the DTC.
2. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
3. Check if the DTC is stored.
Q: Is DTC C1657 stored?
1. YES: Go to Step 3.
2. NO: This diagnosis is complete.
STEP 3. Scan tool (M.U.T.-III) other system DTC
Use scan tool (M.U.T.-III) to check whether the ETACS-ECU-related or engine ECU-related DTC is stored or not.

Q: Is any DTC stored?
1. YES: Troubleshoot for the relevant DTC.
2. NO: Go to Step 4.
STEP 4. Check whether the DTC is stored again.
1. Erase the DTC.
2. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
3. Check if the DTC is stored.
Q: Is DTC C1657 stored?
1. YES: Replace the EPS-ECU (Refer to REMOVAL AND INSTALLATION ). Then go to Step 5.
2. NO: Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
STEP 5. Check whether the DTC is stored again.
1. Erase the DTC.
2. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
3. Check if the DTC is stored.
Q: Is DTC C1657 stored?
1. YES: Return to Step 1.
2. NO: This diagnosis is complete.