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DTC P1771 (P0705): Transmission Range Switch System (Short Circuit): Diagnosis

WARNING: This page is about a different variant/trim than selected.

Required Special Tool: 

  1. STEP 1. Check the transmission range switch. 

    Measure the resistance between the terminals for each transmission range as indicated in the table below.

    RESISTANCE SPECIFICATION

    TRANSMISSION RANGE TERMINAL CONNECTION OF TESTER SPECIFIED CONDITION
    P 3 - 8, 9 - 10 Less than 2 ohms.
    R 7 - 8
    N 4 - 8, 9 - 10
    D 1 - 8
    Fig 1: Locating Transmission Range Switch
    G06685134Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    NOTE: For vehicles with sport mode, four positions (P, R, N, D) are used.

    Q: Does the resistance measure less than 2 ohms for each selector position? 

    1. YES:  Go to Step 2.
    2. NO:  Replace the transmission range switch. Refer to TRANSAXLE <4A/T> or Refer to TRANSAXLE <5A/T>.
      Fig 2: Transmission Range Switch Position
      G04230749Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  2. STEP 2. Check transmission range switch connector B-113 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 3.
    2. NO:  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .
      Fig 3: Locating Transmission Range Switch Connector B-113
      G04231103Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  3. STEP 3. Check PCM connector B-20 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 4: Locating PCM Connector B-20
      G04230610Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  4. STEP 4. Measure the transmission range switch output voltage at PCM connector B-20 by using check harness special tool MB991923. ("P" position) 
    1. Disconnect all the connectors from the PCM.
      Fig 5: Locating PCM Connector B-20
      G04230610Courtesy 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 6: Connecting Special Tool MB991923 (Check Harness) Between PCM And Body-Side Harness Connector
      G04230611Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    4. Measure the voltage between terminal 67 and ground.
      • When transmission range is "P," voltage should equal battery positive voltage.
      • When transmission range is "R," voltage should measure 0.5 volt or less.
      • When transmission range is "N," voltage should measure 0.5 volt or less.
      • When transmission range is "D," voltage should measure 0.5 volt or less.
      • When transmission range is sport mode, voltage should measure 0.5 volt or less.
        Fig 7: Measuring Voltage Between Terminal 67 And Ground
        G06685149Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

      Q: Is the measured voltage within the specified range? 

      1. YES:  Go to Step  6.
      2. NO:  Turn the ignition switch to the "LOCK" (OFF) position. Go to Step 5.
  5. STEP 5. Check harness for damage between PCM connector B-20 terminal 67 and transmission range switch connector B-113 terminal 3. 

    Q: Is the harness wire in good condition? 

    1. YES:  Go to Step  14.
    2. NO:  Repair or replace the harness wire.
      Fig 8: Locating PCM Connector B-20
      G04230610Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 9: Locating Transmission Range Switch Connector B-113
      G04231103Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  6. STEP 6. Measure the transmission range switch output voltage at PCM connector B-20 by using check harness special tool MB991923. ("R" position) 
    • Measure the voltage between terminal 61 and ground.
    • When transmission range is "P," voltage should measure 0.5 volt or less.
    • When transmission range is "R," voltage should equal battery positive voltage.
    • When transmission range is "N," voltage should measure 0.5 volt or less.
    • When transmission range is "D," voltage should measure 0.5 volt or less.
    • When transmission range is sport mode, voltage should measure 0.5 volt or less.

      Q: Is the measured voltage within the specified range? 

      1. YES:  Go to Step  8.
      2. NO:  Turn the ignition switch to the "LOCK" (OFF) position. Go to Step 7.
        Fig 10: Locating PCM Connector B-20
        G04230610Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
        Fig 11: Measuring Voltage Between Terminal 61 And Ground
        G06685159Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  7. STEP 7. Check the harness for damage between PCM connector B-20 terminal 61 and transmission range switch connector B-113 terminal 7. 

    Q: Is the harness wire in good condition? 

    1. YES:  Go to Step  14.
    2. NO:  Repair or replace the harness wire.
      Fig 12: Locating PCM Connector B-20
      G04230610Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 13: Locating Transmission Range Switch Connector B-113
      G04231103Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  8. STEP 8. Measure the transmission range switch output voltage at PCM connector B-20 by using check harness special tool MB991923. ("N" position) 

    Measure the voltage between terminal 77 and ground.

    • When transmission range is "P," voltage should measure 0.5 volt or less.
    • When transmission range is "R," voltage should measure 0.5 volt or less.
    • When transmission range is "N," voltage should equal battery positive voltage.
    • When transmission range is "D," voltage should measure 0.5 volt or less.
    • When transmission range is sport mode, voltage should measure 0.5 volt or less.

      Q: Is the measured voltage within the specified range? 

      1. YES:  Go to Step  10.
      2. NO:  Turn the ignition switch to the "LOCK" (OFF) position. Go to Step 9.
        Fig 14: Locating PCM Connector B-20
        G04230610Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
        Fig 15: Measuring Voltage Between Terminal 77 And Ground
        G06685168Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  9. STEP 9. Check the harness for damage between PCM connector B-20 terminal 77 and transmission range switch connector B-113 terminal 4. 

    Q: Is the harness wire in good condition? 

    1. YES:  Go to Step  14.
    2. NO:  Repair or replace the harness wire.
      Fig 16: Locating PCM Connector B-20
      G04230610Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 17: Locating Transmission Range Switch Connector B-113
      G04231103Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  10. STEP 10. Measure the transmission range switch output voltage at PCM connector B-20 by using check harness special tool MB991923. ("D" position) 

    Measure the voltage between terminal 73 and ground.

    • When transmission range is "P," voltage should measure 0.5 volt or less.
    • When transmission range is "R," voltage should measure 0.5 volt or less.
    • When transmission range is "N," voltage should measure 0.5 volt or less.
    • When transmission range is "D," voltage should equal battery positive voltage.
    • When transmission range is sport mode, voltage should equal battery positive voltage.

      Q: Is the measured voltage within the specified range? 

      1. YES:  Go to Step  14.
      2. NO:  Turn the ignition switch to the "LOCK" (OFF) position. Go to Step 11.
        Fig 18: Locating PCM Connector B-20
        G04230610Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
        Fig 19: Measuring Voltage Between Terminal 73 And Ground
        G06685177Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  11. STEP 11. Check the harness for damage between PCM connector B-20 terminal 73 and transmission range switch connector B-113 terminal 1. 

    Q: Is the harness wire in good condition? 

    1. YES:  Go to Step 12.
    2. NO:  Repair or replace the harness wire.
      Fig 20: Locating PCM Connector B-20
      G04230610Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 21: Locating Transmission Range Switch Connector B-113
      G04231103Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  12. STEP 12. Check intermediate connector A-15, 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 13.
    2. NO:  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .
      Fig 22: Locating Intermediate Connector A-15
      G04230645Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 23: Locating PCM Connector B-19
      G04231073Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 24: Locating Shift Switch Assembly Connector C-17
      G04231093Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  13. STEP 13. Check the harness for damage between PCM connector B-19 terminal 39 and transmission range switch connector B-113 terminal 1. 

    Q: Is the harness wire in good condition? 

    1. YES:  Go to Step 14.
    2. NO:  Repair or replace the harness wire.
      Fig 25: Locating PCM Connector B-19
      G04231073Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 26: Locating Transmission Range Switch Connector B-113
      G04231103Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  14. STEP 14. Using scan tool MB991958, check data list item 34: Transmission Range Switch. 
    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 data reading mode.
      • Item 34: Transmission Range Switch.
        • Move the selector lever to "P," "R," "N," "D" and sport mode positions and confirm that the selected transmission ranges match the positions (The scan tool displays "D" range when the selector lever is shifted to the sport mode).
    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.
        Fig 27: Connecting Special Tool MB991910 To Data Link Connector
        G04230562Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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