DTC U0100: Engine CAN timeout; DTC U0121 ABS/ASC CAN timeout; DTC U0126 SAS CAN timeout: Diagnosis

STEP 1. Using scan tool (M.U.T.-IIISE), diagnose CAN bus line.
CAUTION: To prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
1. Connect scan tool (M.U.T.-IIISE). Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) ."
2. Use scan tool (M.U.T.-IIISE) to diagnose the CAN bus lines.
Q: Is the check result normal?

YES: Go to Step 3.

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. Engine start
3. Check if the DTC is set.
Q: Is DTCs No.U0100, U0121 or U0126 set?

YES: Go to Step 3.

NO: This diagnosis is complete.
STEP 3. Using scan tool (M.U.T.-IIISE), check whether the DTC is set.
Use scan tool (M.U.T.-IIISE) to check if the same DTC (time-out) is set in the other ECU.

Q: Is any DTC set?

YES (DTC U0100 is set): Replace the ECM (Refer to ENGINE CONTROL MODULE ), and then go to Step 4.

YES (DTC U0121 is set): Replace the ASC-ECU (Refer to HYDRAULIC UNIT ), and then go to Step 4.

YES (DTC U0126 is set): Replace the steering wheel sensor (Refer to STEERING WHEEL SENSOR ), and then go to Step 4.

NO (No DTC is set.): Go to Step 4.
STEP 4. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
1. Erase the DTC.
2. Engine start
3. Check if the DTC is set.
Q: Is DTCs No.U0100, U0121 or U0126 set?

YES: Replace the EPS-ECU (Refer to TIE ROD END BALL JOINT DUST COVER REPLACEMENT ).

NO: Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).