INSPECTION PROCEDURE 15: Shift Switch Assembly System: 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 A/T 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 for A/T diagnostic trouble code.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

      Q: Is DTC P1770 (P0705) or P1771 (P0705) set? 

      1. YES <DTC P1770 (P0705) set>:  Refer to , DTC P1770 (P0705): TRANSMISSION RANGE SWITCH SYSTEM (OPEN CIRCUIT) .
      2. YES <DTC P1771 (P0705) set>:  Refer to , DTC P1771 (P0705): TRANSMISSION RANGE SWITCH SYSTEM (SHORT CIRCUIT) .
      3. NO:  Go to Step 2.
         Fig 1: Connecting Special Tool MB991910 To Data Link Connector

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2. STEP 2. Using scan tool MB991958, check data list item 27: Select Switch, item 28: Shift Switch (Up), item 29: Shift Switch (Down). 
   1. Connect scan tool MB991958 to the data link connector.
   2. Turn the ignition switch to the "ON" position.
   3. Set scan tool MB991958 to the data reading mode for following items.
      1. Item 27: Select Switch
      2. Item 28: Shift Switch (Up)
      3. Item 29: Shift Switch (Down)
      SELECTOR LEVER OPERATION
      
      

      SELECTOR LEVER OPERATION	DATA LIST ITEM
      	27	28	29
      D range	OFF	OFF	OFF
      Sport mode	ON	OFF	OFF
      Upshift and hold the selector lever	ON	ON	OFF
      Downshift and hold the selector lever	ON	OFF	ON

      Fig 2: Connecting Special Tool MB991910 To Data Link Connector

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      NOTE: The switches above are displayed, depending on the selector lever condition as shown in the table.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

      Q: Is the switch operating properly? 

      1. YES:  It can be assumed that this malfunction is intermittent. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .
      2. NO <If completely NG>:  Go to Step 3.
      3. NO <If item 28 and item 29 both are NG>:  Go to Step  5.
      4. NO <If only item 27 is NG>:  Go to Step  9.
      5. NO <If only item 28 is NG>:  Go to Step  17.
      6. NO <If only item 29 is NG>:  Go to Step  22.
3. STEP 3. Check PCM connector B-19 and shift switch assembly connector C-17 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Are the connectors in good condition? 

   1. YES:  Go to Step 4.
   2. NO:  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .
      Fig 3: Locating PCM Connector B-19

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      Fig 4: Locating Shift Switch Assembly Connector C-17

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4. STEP 4. Using scan tool MB991958, check data list item 27: Select Switch, item 28: Shift Switch (Up), item 29: Shift Switch (Down). 
   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. Set scan tool MB991958 to the data reading mode for following items.
      1. Item 27: Select Switch
      2. Item 28: Shift Switch (Up)
      3. Item 29: Shift Switch (Down)
         SELECTOR LEVER OPERATION
         
         

         SELECTOR LEVER OPERATION	DATA LIST ITEM
         	27	28	29
         D range	OFF	OFF	OFF
         Sport mode	ON	OFF	OFF
         Upshift and hold the selector lever	ON	ON	OFF
         Downshift and hold the selector lever	ON	OFF	ON

         Fig 5: Connecting Special Tool MB991910 To Data Link Connector

         Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
         NOTE: The switches above are displayed, depending on the selector lever condition as shown in the table.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

      Q: Is the switch operating properly? 

      1. YES:  It can be assumed that this malfunction is intermittent. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .
      2. NO:  Replace the PCM. When the PCM is replaced, register the encrypted code. Refer to ENCRYPTED CODE REGISTRATION CRITERIA TABLE .
5. STEP 5. Check the shift switch assembly. 

   Refer to , TRANSAXLE CONTROL .

   Q: Is the switch operating properly? 

   1. YES:  Go to Step 6.
   2. NO:  Replace the shift switch assembly. Refer to , TRANSAXLE CONTROL .
6. STEP 6. Measure the power supply voltage at shift switch assembly connector C-17. 
   1. Disconnect connector C-17 and measure at the harness side.
   2. Turn the ignition switch to the "ON" position.
      Fig 6: Locating Shift Switch Assembly Connector C-17

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   3. Measure the voltage between terminal 2 and ground.
      • The voltage should measure battery positive voltage.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

      Q: Is the measured voltage battery positive voltage? 

      1. YES:  Go to Step  4.
      2. NO:  Go to Step 7.
         Fig 7: Measuring Voltage Between Terminal 2 And Ground

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7. STEP 7. Check joint connector (1) C-28 and shift switch assembly connector C-17 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Are the connectors and terminals in good condition? 

   1. YES:  Go to Step 8.
   2. NO:  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .
      Fig 8: Locating Joint Connector C-28

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      Fig 9: Locating Shift Switch Assembly Connector C-17

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8. STEP 8. Check the harness for open circuit or short circuit to ground between joint connector (1) C-28 terminal 24 and shift switch assembly connector C-17 terminal 2. 

   Q: Is the harness wire in good condition? 

   1. YES:  Go to Step  4.
   2. NO:  Repair or replace the harness wire.
      Fig 10: Locating Joint Connector C-28

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      Fig 11: Locating Shift Switch Assembly Connector C-17

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9. STEP 9. Measure the power supply voltage at shift switch assembly connector C-17. 
   1. Disconnect connector C-17 and measure at the harness side.
   2. Turn the ignition switch to the "ON" position.
   3. Move the selector lever to the "D" position.
      Fig 12: Locating Shift Switch Assembly Connector C-17

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   4. Measure the voltage between terminal 1 and ground.
      • The voltage should measure battery positive voltage.
   5. Turn the ignition switch to the "LOCK" (OFF) position.

      Q: Is the measured voltage battery positive voltage? 

      1. YES:  Go to Step  12.
      2. NO:  Go to Step 10.
         Fig 13: Measuring Voltage Between Terminal 1 And Ground

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10. STEP 10. Check intermediate connector A-15 and shift switch assembly connector C-17 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connector and terminals in good condition? 

    1. YES:  Go to Step 11.
    2. NO:  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .
       Fig 14: Locating Intermediate Connector A-15

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       Fig 15: Locating Shift Switch Assembly Connector C-17

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11. STEP 11. Check harness for open circuit or short circuit to ground between transmission range switch connector B-113 terminal 1 and shift switch assembly connector C-17 terminal 1. 

    Q: Is the harness wire in good condition? 

    1. YES:  Go to Step  4.
    2. NO:  Repair or replace the harness wire.
       Fig 16: Locating Transmission Range Switch Connector B-113

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       Fig 17: Locating Shift Switch Assembly Connector C-17

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12. STEP 12. Check the shift switch assembly. 

    Refer to , TRANSAXLE CONTROL .

    Q: Is the switch operating properly? 

    1. YES:  Go to Step 13.
    2. NO:  Replace the shift switch assembly. Refer to , TRANSAXLE CONTROL .
13. STEP 13. Measure the shift switch output voltage at PCM connector B-19 by using check harness special tool MB991923. 
    1. Disconnect all the connectors from the PCM.
       Fig 18: Locating PCM Connector B-19

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    2. Connect special tool MB991923 (check harness) between the PCM and the body-side harness connector.
    3. Turn the ignition switch to the "ON" position.
    4. Move the selector lever to the sport mode.
       Fig 19: Connecting Special Tool MB991923 Between PCM And Body-Side Harness Connector

       Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    5. Measure the voltage between terminal 39 and ground.
       • The voltage should measure battery positive voltage.
    6. Turn the ignition switch to the "LOCK" (OFF) position.

       Q: Is the measured voltage battery positive voltage? 

       1. YES:  Go to Step  16.
       2. NO:  Go to Step 14.
          Fig 20: Measuring Voltage Between Terminal 39 And Ground

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14. STEP 14. Check PCM connector B-19 and shift switch assembly connector C-17 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connectors and terminals in good condition? 

    1. YES:  Go to Step 15.
    2. NO:  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .
       Fig 21: Locating PCM Connector B-19

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       Fig 22: Locating Shift Switch Assembly Connector C-17

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15. STEP 15. Check the harness for open circuit or short circuit to ground between PCM connector B-19 terminal 39 and shift switch assembly connector C-17 terminal 6. 

    Q: Is the harness wire in good condition? 

    1. YES:  Go to Step  4.
    2. NO:  Repair or replace the harness wire.
       Fig 23: Locating PCM Connector B-19

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       Fig 24: Locating Shift Switch Assembly Connector C-17

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16. STEP 16. Check PCM connector B-19 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connector and terminals in good condition? 

    1. YES:  Go to Step  4.
    2. NO:  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .
       Fig 25: Locating PCM Connector B-19

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17. STEP 17. Check the shift switch assembly. 

    Refer to , TRANSAXLE CONTROL .

    Q: Is the switch operating properly? 

    1. YES:  Go to Step 18.
    2. NO:  Replace the shift switch assembly. Refer to , TRANSAXLE CONTROL .
18. STEP 18. Measure the switch output voltage at PCM connector B-19 by using check harness special tool MB991923. 
    1. Disconnect all the connectors from the PCM.
       Fig 26: Locating PCM Connector B-19

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    2. Connect special tool MB991923 (check harness) between the PCM and the body-side harness connector.
    3. Turn the ignition switch to the "ON" position.
       Fig 27: Connecting Special Tool MB991923 Between PCM And Body-Side Harness Connector

       Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    4. Measure the voltage between terminal 32 and ground.
       • The voltage should measure battery positive voltage when the selector lever is upshift and hold.
    5. Turn the ignition switch to the "LOCK" (OFF) position.

       Q: Is the measured voltage battery positive voltage? 

       1. YES:  Go to Step  21.
       2. NO:  Go to Step 19.
          Fig 28: Measuring Voltage Between Terminal 32 And Ground

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19. STEP 19. Check PCM connector B-19 and shift switch assembly connector C-17 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connectors and terminals in good condition? 

    1. YES:  Go to Step 20.
    2. NO:  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .
       Fig 29: Locating PCM Connector B-19

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       Fig 30: Locating Shift Switch Assembly Connector C-17

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20. STEP 20. Check the harness for open circuit or short circuit to ground between PCM connector B-19 terminal 32 and shift switch assembly connector C-17 terminal 7. 

    Q: Is the harness wire in good condition? 

    1. YES:  Go to Step  4.
    2. NO:  Repair or replace the harness wire.
       Fig 31: Locating PCM Connector B-19

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       Fig 32: Locating Shift Switch Assembly Connector C-17

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21. STEP 21. Check PCM connector B-19 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connector and terminals in good condition? 

    1. YES:  Go to Step  4.
    2. NO:  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .
       Fig 33: Locating PCM Connector B-19

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22. STEP 22. Check the shift switch assembly. 

    Refer to , TRANSAXLE CONTROL .

    Q: Is the switch operating properly? 

    1. YES:  Go to Step 23.
    2. NO:  Replace the shift switch assembly. Refer to , TRANSAXLE CONTROL .
23. STEP 23. Measure the switch output voltage at PCM connector B-19 by using check harness special tool MB991923. 
    1. Disconnect all the connectors from the PCM.
       Fig 34: Locating PCM Connector B-19

       Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Connect special tool MB991923 (check harness) between the PCM and the body-side harness connector.
    3. Turn the ignition switch to the "ON" position.
       Fig 35: Connecting Special Tool MB991923 Between PCM And Body-Side Harness Connector

       Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    4. Measure the voltage between terminal 36 and ground.
       • The voltage should measure battery positive voltage when the selector lever is downshift and hold.
    5. Turn the ignition switch to the "LOCK" (OFF) position.

       Q: Is the measured voltage battery positive voltage? 

       1. YES:  Go to Step  26.
       2. NO:  Go to Step 24.
          Fig 36: Measuring Voltage Between Terminal 36 And Ground

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24. STEP 24. Check PCM connector B-19 and shift switch assembly connector C-17 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connectors and terminals in good condition? 

    1. YES:  Go to Step 25.
    2. NO:  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .
       Fig 37: Locating PCM Connector B-19

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       Fig 38: Locating Shift Switch Assembly Connector C-17

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25. STEP 25. Check the harness for open circuit or short circuit to ground between PCM connector B-19 terminal 36 and shift switch assembly connector C-17 terminal 3. 

    Q: Is the harness wire in good condition? 

    1. YES:  Go to Step  4.
    2. NO:  Repair or replace the harness wire.
       Fig 39: Locating PCM Connector B-19

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       Fig 40: Locating Shift Switch Assembly Connector C-17

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26. STEP 26. Check PCM connector B-19 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connector and terminals in good condition? 

    1. YES:  Go to Step  4.
    2. NO:  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .
       Fig 41: Locating PCM Connector B-19

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