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DTC U0141: ETACS CAN Timeout


caution
  • If the DTC U0141 is set in the occupant classification-ECU, always diagnose the CAN main bus lines.
  • When replacing the ECU, always check that the communication circuit is normal.

DIAGNOSTIC FUNCTION


If the signal from ETACS-ECU cannot be received, the occupant classification-ECU sets the DTC U0141.

DTC SET CONDITIONS


Because of the CAN-B bus circuit malfunction, if occupant classification-ECU becomes unable to perform the normal data transmission, occupant classification-ECU determines that an abnormality is present.

TROUBLESHOOTING HINTS



DIAGNOSIS
Required Special Tools:
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)

    • MB991824: Vehicles Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

STEP 1. Using scan tool MB991958, diagnose the CAN bus line

(1)
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.
Connect scan tool MB991958. Refer to "How to connect the scan tool ."
(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?

Go to Step 2.

Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).

STEP 2. Using scan tool MB991958, read the ETACS-ECU diagnostic trouble code
Check again if the DTC is set to the ETACS-ECU.

Q. Is the DTC set?
Diagnose the ETACS-ECU. Then go to Step 4.
Go to Step 3.

STEP 3. Using scan tool MB991958, read diagnostic trouble code No. U0141 for other system.
Check if the DTC U0141 is set in SRS-ECU, combination meter, A/C-ECU, KOS-ECU or WCM, hands free module, CAN box unit, radio and CD player, satellite radio tuner.

Q. Is the DTC set?
Replace the ETACS-ECU (Refer to GROUP 54A, ETACS - ETACS-ECU ).
Go to Step 4.

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the occupant classification-ECU.
(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?
Replace the slide adjuster (RH) (Refer to GROUP 52A, Front Seat Assembly ).
There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).