U1101: Can Communications System Time Out Error A/T Related Data: Diagnosis

Required Special Tools: 

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: V.C.I.
  • MB991827: M.U.T.-III USB Cable
  • MB991910: M.U.T.-III Main Harness A

1. 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 to the data link connector. Refer to DIAGNOSIS FUNCTION  .
   2. Turn the ignition switch to the "ON" position.
   3. Diagnose the CAN bus line. Refer to DIAGNOSIS FUNCTION  .
   4. Turn the ignition switch to the "LOCK" (OFF) position.
   5. Disconnect scan tool MB991958.

   Q: Is the CAN bus line found to be normal? 

   YES:  Go to Step 2.

   NO:  Repair the CAN bus lines. Refer to CAN BUS DIAGNOSTICS TABLE , then go to  Step 6.

   Fig 1: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Using scan tool MB991958, read the diagnostic trouble code. 
   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 to the data link connector. Refer to DIAGNOSIS FUNCTION  .
   2. Turn the ignition switch to the "ON" position.
   3. Check for A/T system diagnostic trouble code. Refer to AUTOMATIC TRANSAXLE DIAGNOSIS ).
   4. Turn the ignition switch to the "LOCK" (OFF) position.
   5. Disconnect scan tool MB991958.

   Q: Is any DTC set? 

   YES:  Repair the automatic transaxle control system. Refer to DIAGNOSTIC TROUBLE CODE CHART , then go to  Step 6.

   NO:  Go to Step 3.

   Fig 2: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Using scan tool MB991958, read the diagnostic trouble code. 
   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 to the data link connector. Refer to DIAGNOSIS FUNCTION  .
   2. Turn the ignition switch to the "ON" position.
   3. Check if a DTC, which relates to CAN communication-linked systems below, is set.

      ETACS-ECU

      • DTC 012: Power train control module time-out (related to A/T). Refer to HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES .

      Combination meter

      • DTC 012: Power train control module time-out (related to A/T). Refer to HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES .

      Multi-center display

      • DTC 012: Power train control module time-out (related to A/T). Refer to HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES .
   4. Turn the ignition switch to the "LOCK" (OFF) position.
   5. Disconnect scan tool MB991958.

   Q: Is DTC 012 set? 

   YES:  Go to Step 4.

   NO:  Go to  Step 5.

   Fig 3: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Using scan tool MB991958, read the diagnostic trouble code. 
   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 to the data link connector. Refer to DIAGNOSIS FUNCTION  .
   2. Turn the ignition switch to the "ON" position.
   3. Use scan tool MB991958 to read the TCL diagnostic trouble codes. Refer to DIAGNOSIS FUNCTION  .
   4. Turn the ignition switch to the "LOCK" (OFF) position.
   5. Disconnect scan tool MB991958.

   Q: Is DTC U1101 set? 

   YES:  Replace the PCM. [Refer to REMOVAL AND INSTALLATION for 2.4L or REMOVAL AND INSTALLATION for 3.8L ]. Then go to  Step 6.

   NO:  It can be assumed that this malfunction is intermittent. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .

   Fig 4: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. STEP 5. Using scan tool MB991958, read the diagnostic trouble code. 
   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 to the data link connector. Refer to DIAGNOSIS FUNCTION  .
   2. Turn the ignition switch to the "ON" position.
   3. Use scan tool MB991958 to read the TCL diagnostic trouble codes. Refer to DIAGNOSIS FUNCTION  .
   4. Turn the ignition switch to the "LOCK" (OFF) position.
   5. Disconnect scan tool MB991958.

   Q: Is DTC U1101 set? 

   YES:  Replace the hydraulic unit (integrated with ABS/TCL-ECU). Refer to HYDRAULIC UNIT , then go to Step 6.

   NO:  It can be assumed that this malfunction is intermittent. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .

   Fig 5: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. STEP 6. Using scan tool MB991958, read the diagnostic trouble code. 
   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 to the data link connector. Refer to DIAGNOSIS FUNCTION  .
   2. Turn the ignition switch to the "ON" position.
   3. Use scan tool MB991958 to read the TCL diagnostic trouble codes. Refer to DIAGNOSIS FUNCTION  .
   4. Turn the ignition switch to the "LOCK" (OFF) position.
   5. Disconnect scan tool MB991958.

   Q: Is DTC U1101 set? 

   YES:  Return to  Step 1.

   NO:  The procedure is complete.

   Fig 6: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.