DTC U1101: Pcm Time-Out (Related To Transaxle): Diagnosis

Required Special Tools: 

• MB991958: Scan Tool (MUT-III Sub Assembly)
  • MB991824: V.C.I.
  • MB991827: MUT-III USB Cable
  • MB991910: MUT-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.
   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? 

   YES :  Go to Step 2.

   NO :  Repair the CAN bus line (Refer to DIAGNOSIS ). 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. Erase the DTC.
   2. Turn the ignition switch to the "ON" position.
   3. Check for A/T system diagnostic trouble code. (Refer to A/T Diagnosis - Diagnostic Function - HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODE ).
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is any DTC set? 

   YES :  Repair the automatic transaxle control system. (Refer to A/T Diagnosis - 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.
   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 U1100: ECM < M/T > or PCM < A/T > time-out (related to engine). (Refer to SWS Diagnosis - General Description - Diagnostic Function - HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES ).

      Combination meter

      • DTC U1100: ECM < M/T > or PCM < A/T > time-out (related to engine). (Refer to Combination Meter Assembly Diagnosis Function - HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES ).
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is DTC U1100 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.
   2. Turn the ignition switch to the "ON" position.
   3. Check if the DTC is set.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is DTC U1101 set? 

   YES :  Replace the PCM. [Refer to ENGINE CONTROL MODULE (ECM) AND POWERTRAIN CONTROL MODULE (PCM) ]. Then go to  Step 6.

   NO :  It can be assumed that this malfunction is intermittent. (Refer to How to Use Troubleshooting/Inspection Service Points - 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.
   2. Turn the ignition switch to the "ON" position.
   3. Check if the DTC is set.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is DTC U1101 set? 

   YES :  Replace the hydraulic unit (integrated with ABS/TCL-ECU). Then go to Step 6.

   NO :  It can be assumed that this malfunction is intermittent. (Refer to How to Use Troubleshooting/Inspection Service Points - 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.
   2. Turn the ignition switch to the "ON" position.
   3. Check if the DTC is set.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   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.