DTC U1000 OSS: CAN timeout: Diagnosis

STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus line.
CAUTION: To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
1. Connect scan tool (M.U.T.-III). Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ."
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES: Go to Step 2.

NO: Repair the CAN bus line (Refer to DIAGNOSIS <CAN> ).
STEP 2. Using scan tool (M.U.T.-III), read the OSS diagnostic trouble code.
Check again if the DTC is set in the OSS-ECU.

Q: Is the DTC set?

YES: Troubleshoot the OSS-ECU (Refer to DIAGNOSTIC TROUBLE CODE CHART ), and then go to Step 3.

NO: Go to Step 3.
STEP 3. Using scan tool (M.U.T.-III), read the ETACS diagnostic trouble code.
Check if DTC No. U1000 is set in ETACS-ECU.

Q: Is the DTC set?

YES: Go to Step 4.

NO: Go to Step 5.
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set in the CAN box unit.
1. Erase the DTC.
2. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
3. Check if the DTC is set.
Q: Is the DTC set?

YES: Replace the OSS-ECU. (Refer to OSS-ECU .)

NO: A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the CAN box unit and the OSS-ECU. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set in the CAN box unit.
1. Erase the DTC.
2. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
3. Check if DTC is set.
Q: Is the DTC set?

YES: Replace the CAN box unit.

NO: A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the CAN box unit and the OSS-ECU. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)