C1397 Transmission Range Switch Input Refusal: 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, 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 HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)  ).
   2. Turn the ignition switch to the "ON" position.
   3. Check for A/T system diagnostic trouble code. (Refer to HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODE ).
   4. Turn the ignition switch to the "LOCK" (OFF) position.
   5. Disconnect scan tool MB991958.

      Q: Is any DTC set? 

      1. YES:  Repair the automatic transaxle control system. (Refer to DIAGNOSTIC TROUBLE CODE CHART ). Then go to Step  3.
      2. NO:  Go to Step 2.
         Fig 1: Connecting Special 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 HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)  ).
   2. Turn the ignition switch to the "ON" position.
   3. Use scan tool MB991958 to read the TCL diagnostic trouble codes. (Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)  ).
   4. Turn the ignition switch to the "LOCK" (OFF) position.
   5. Disconnect scan tool MB991958.

      Q: Is DTC C1397 set? 

      1. YES:  Replace the hydraulic unit (integrated with TCL/ASC-ECU). (Refer to HYDRAULIC UNIT ). Then go to Step 3.
      2. NO:  It can be assumed that this malfunction is intermittent. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
         Fig 2: Connecting Special 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 HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)  ).
   2. Turn the ignition switch to the "ON" position.
   3. Use scan tool MB991958 to read the TCL diagnostic trouble codes. (Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)  ).
   4. Turn the ignition switch to the "LOCK" (OFF) position.
   5. Disconnect scan tool MB991958.

      Q: Is DTC C1397 set? 

      1. YES:  Return to Step  1.
      2. NO:  The procedure is complete.
         Fig 3: Connecting Special Tool To Data Link Connector

         Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.