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Home >> Mitsubishi >> 2010 >> Eclipse Spyder GS, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transaxle On-Vehicle Service) >> Automatic Transaxle Diagnosis >> Diagnostic Trouble Code Procedures >> DTC P1764 (P0712): Transmission Fluid Temperature Sensor System (Short Circuit) >> Diagnosis

DTC P1764 (P0712): Transmission Fluid Temperature Sensor System (Short Circuit): Diagnosis

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

Required Special Tools: 

  1. STEP 1. Using scan tool MB991958, check data list item 7: Transmission Fluid Temperature Sensor. 
    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. Start the engine.
    3. Set scan tool MB991958 to the data reading mode.
      • Item 7: Transmission Fluid Temperature Sensor.
        • When the engine is cool: Almost equal to the ambient temperature (atmospheric temperature)
          NOTE: Set scan tool MB991958 to the data reading mode for item number 5, Intake Air Temperature (IAT) Sensor and note the temperature measurement. When the engine is cool, the temperature should be almost equal to the ambient temperature (atmospheric temperature), and the IAT sensor measurement should be approximately the same as the Transmission Fluid Temperature Sensor.
        • When the engine is warm: 70 - 80°C (158 - 176°F).
          Fig 1: Connecting Special Tool MB991910 To Data Link Connector
          G04230562Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

      Q: Is the sensor operating properly? 

      1. YES:  It can be assumed that this malfunction is intermittent. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .
      2. NO:  Go to Step 2.
  2. STEP 2. Measure the sensor output voltage at the A/T control solenoid valve assembly connector B-111 by backprobing. 
    1. Do not disconnect connector B-111.
    2. Turn the ignition switch to the "ON" position.
      Fig 2: Locating Control Solenoid Valve Assembly Connector B-111
      G04230608Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Measure the voltage between terminal 1 and ground by backprobing.
      • When transmission fluid temperature is 20°C (68°F), voltage should measure between 3.8 and 4.0 volts.
      • When transmission fluid temperature is 40°C (104°F), voltage should measure between 3.2 and 3.4 volts.
      • When transmission fluid temperature is 80°C (176°F), voltage should measure between 1.7 and 1.9 volts.
    4. Turn the ignition switch to the "LOCK" (OFF) position.
      Fig 3: Measuring Voltage Between Terminal 1 And Ground
      G06684989Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

      Q: Is the measured voltage within the specified range? 

      1. YES:  Go to Step  6.
      2. NO:  Go to Step 3.
  3. STEP 3. Check A/T control solenoid valve assembly connector B-111 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 Control Solenoid Valve Assembly Connector B-111
      G04230608Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  4. STEP 4. Check the sensor output voltage at A/T control solenoid valve assembly connector B-111. 
    1. Disconnect connector B-111 and measure at the harness side.
    2. Turn the ignition switch to the "ON" position.
      Fig 5: Locating Control Solenoid Valve Assembly Connector B-111
      G04230608Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Measure the voltage between terminal 1 and ground.
      • The voltage should measure between 4.5 and 4.9 volts.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

      Q: Is the measured voltage between 4.5 and 4.9 volts? 

      1. YES:  Go to Step 5.
      2. NO:  Go to Step  7.
        Fig 6: Measuring Voltage Between Terminal 1 And Ground
        G06684993Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  5. STEP 5. Check the transmission fluid temperature sensor at A/T control solenoid valve assembly connector B-111. 
    1. Disconnect connector B-111 and measure at the sensor side.
      Fig 7: Locating Control Solenoid Valve Assembly Connector B-111
      G04230608Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Measure the resistance between terminal 1 and 2.
      • When transmission fluid temperature is 0°C (32°F), resistance should be between 16.7 and 20.5 kΩ.
      • When transmission fluid temperature is 20°C (68°F), resistance should be between 7.3 and 8.9 kΩ.
      • When transmission fluid temperature is 40°C (104°F), resistance should be between 3.4 and 4.2 kΩ.
      • When transmission fluid temperature is 60°C (140°F), resistance should be between 1.9 and 2.2 kΩ.
      • When transmission fluid temperature is 80°C (176°F), resistance should be between 1.0 and 1.2 kΩ.
      • When transmission fluid temperature is 100°C (212°F), resistance should be between 0.57 and 0.69 kΩ.
        Fig 8: Measuring Resistance Between Terminal 1 And 2
        G06685020Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

      Q: Is the measured resistance within the specified range? 

      1. YES:  Go to Step 6.
      2. NO:  Replace the transmission fluid temperature sensor. Refer to TRANSAXLE <4A/T> or Refer to TRANSAXLE <5A/T>.
  6. STEP 6. Using scan tool MB991958, check data list item 7: Transmission Fluid Temperature Sensor. 
    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. Start the engine.
    3. Set scan tool MB991958 to the data reading mode.
      • Item 7: Transmission Fluid Temperature Sensor.
        • When the engine is cool: Almost equal to the ambient temperature (atmospheric temperature)
          NOTE: Set scan tool MB991958 to the data reading mode for item number 13, Intake Air Temperature (IAT) Sensor and note the temperature measurement. When the engine is cool, the temperature should be almost equal to the ambient temperature (atmospheric temperature), and the IAT sensor measurement should be approximately the same as the Transmission Fluid Temperature Sensor.
        • When the engine is warm: 70 - 80°C (158 - 176°F).
          Fig 9: Connecting Special Tool MB991910 To Data Link Connector
          G04230562Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

      Q: Is the sensor 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 .
  7. STEP 7. Measure the sensor output voltage at PCM connector B-20 by using check harness special tool MB991923. 
    1. Disconnect all the connectors from the PCM.
      Fig 10: 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 11: 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 74 and ground.
      • When transmission fluid temperature is 20°C (68°F), voltage should measure between 3.8 and 4.0 volts.
      • When transmission fluid temperature is 40°C (104°F), voltage should measure between 3.2 and 3.4 volts.
      • When transmission fluid temperature is 80°C (176°F), voltage should measure between 1.7 and 1.9 volts.
    5. Turn the ignition switch to the "LOCK" (OFF) position.
      Fig 12: Measuring Voltage Between Terminal 74 And Ground
      G06685002Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

      Q: Is the measured voltage within the specified range? 

      1. YES:  Go to Step  6.
      2. NO:  Go to Step 8.
  8. STEP 8. 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 9.
    2. NO:  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .
      Fig 13: Locating PCM Connector B-20
      G04230610Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  9. STEP 9. Check the harness for a short circuit to ground between PCM connector B-20 terminal 74 and A/T control solenoid valve connector B-111 terminal 1. 

    Q: Is the harness wire in good condition? 

    1. YES:  Go to Step  6.
    2. NO:  Repair or replace the harness wire.
      Fig 14: Locating PCM Connector B-20
      G04230610Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 15: Locating Control Solenoid Valve Assembly Connector B-111
      G04230608Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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