DTC U1109: Column SW LIN timeout: 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)

1. STEP 1. Check ETACS-ECU connector C-301 and column switch connector C-212 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Are ETACS-ECU connector C-301 and column switch connector C-212 in good condition? 

   YES  : Go to Step 2.

   NO  : Repair or replace the damaged component(s).

2. STEP 2. Check the wiring harness between ETACS-ECU connector C-301 (terminal 1) and column switch connector C-212 (terminal 3). 
   NOTE: Also check joint connector C-102 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-102 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

   Q: Is the wiring harness between ETACS-ECU connector C-301 (terminal 1) and column switch connector C-212 (terminal 3) in good condition? 

   YES  : Go to Step 3.

   NO  : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.

3. STEP 3. Recheck for diagnostic trouble code. 

   Check again if the DTC is set to the ETACS-ECU.

   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)  ".
      Fig 1: Connecting Special Tool To Data Link Connector

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   2. Erase the DTC.
   3. Turn the ignition switch to the "ON" position.
   4. Check if the DTC is set.
   5. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the DTC set? 

   YES  : Replace the column switch.

   NO  : A poor connection, open circuit or other intermittent malfunction is present in the LIN bus lines between the column switch and the ETACS-ECU (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).