DTC U0168: OSS-ECU CAN timeout: Diagnosis

STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958. 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?
1. YES: Go to Step 2.
2. NO: Repair the CAN bus line (Refer to PRECAUTIONS ON HOW TO REPAIR THE CAN BUS LINES ).
STEP 2. Using scan tool MB991958, read the OSS-ECU diagnostic trouble code.
Check again if the DTC is set to the OSS-ECU.

Q: Is the DTC set?
1. YES: Troubleshoot the OSS-ECU (Refer to TROUBLESHOOTING ).
2. NO: Go to Step 3.
STEP 3. Using scan tool MB991958, read the diagnostic trouble code.
Check if the DTC U0168 is set to the ETACS-ECU.

Q: Is the DTC set?
1. YES: Go to Step 4.
2. NO: Go to Step 5.
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the combination meter.
1. Erase the DTC.
2. Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
3. Check if DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
1. YES: Replace the OSS-ECU.
2. NO: The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the OSS-ECU and the combination meter (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the combination meter.
1. Erase the DTC.
2. Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
3. Check if DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
1. YES: Replace the combination meter.
2. NO: The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the OSS-ECU and the combination meter (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).