DTC U1206: Flag invalid: Diagnosis

Required Special Tools: 

• MB991958: Scan Tool (MUT-III Sub Assembly)
  • MB991824: Vehicle Communication Interface (V.C.I.)
  • MB991827: MUT-III USB Cable
  • MB991910: MUT-III Main Harness A (Vehicles with CAN communication system)

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

   Use scan tool MB991958 to diagnose the CAN bus lines.

   1. Connect scan tool MB991958 to the data link connector.
      Fig 1: Connecting Scan Tool To Data Link Connector

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   2. Turn the ignition switch to "ON" position.
   3. Diagnose the CAN bus line.

   Q: Is the check result satisfactory? 

   1. YES  : Go to Step 2.
   2. NO  : Repair the CAN bus lines (Refer to DIAGNOSIS-CAN BUS DIAGNOSTIC CHART < vehicles without advanced air bag > or < vehicles with advanced air bag>). On completion, go to  Step 4.
2. STEP 2. Using scan tool MB991958, read the ETACS-ECU diagnostic trouble code. 

   Check that the ETACS-ECU sets a DTC.

   Q: Is the DTC set? 

   1. YES  : Diagnose the SWS system by referring to DIAGNOSTIC TROUBLE CODE CHART .
   2. NO  : Go to Step 3.
3. STEP 3. Replace the ETACS-ECU and then recheck for diagnostic trouble code. 

   Replace the ETACS-ECU, and then check that the DTC is not reset.

   Q: Is the check result satisfactory? 

   1. YES  : Go to Step 4.
   2. NO  : Replace combination meter and then go to step 4.
4. STEP 4. Recheck for diagnostic trouble code. 

   Recheck if the DTC is set.

   1. Erase the DTC.
   2. Turn the ignition switch to "ON" position.
   3. Check if the DTC is set.

   Q: Is the check result satisfactory? 

   1. YES  : The procedure is complete.
   2. NO  : Go to  Step 1.