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DTC 22: Input Shaft Speed Sensor System: Diagnosis

Required Special Tool: 

  1. MB991502: Scan Tool (MUT-II)
  1. STEP 1. Using scan tool MB991502, check data list item 22: Input Shaft Speed Sensor. 
    CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
    1. Connect scan tool MB991502 to the data link connector.
      Fig 1: Connecting Scan Tool To Data Link Connector
      G01876315Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Start the engine.
    3. Set scan tool MB991502 to data reading mode for item 22, Input Shaft Speed Sensor.
      • When driving at constant speed of 50 km/h (31 mph), the display should be "1,600 - 1,900 r/min." (Gear range: 3rd gear)
    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.
    2. NO:  Go to Step 2.
  2. STEP 2. Measure the power supply voltage at the input shaft speed sensor connector B-110. 
    1. Disconnect connector B-110 and measure at the harness side.
      Fig 2: Disconnecting Connector B-110 & Measuring At Harness Side
      G01876316Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Turn the ignition switch to the "ON" position.
    3. Measure the voltage between terminal 3 and ground.
      • The voltage should measure battery positive voltage.
      Fig 3: Measuring Voltage Between Terminal 3 & Ground
      G01876317Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the measured voltage battery positive voltage? 

    1. YES:  Go to  Step 5 .
    2. NO:  Go to Step 3.
  3. STEP 3. Check intermediate connector C-123 and junction block connector C-210 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 4: Checking Intermediate Connector C-223
    G01876318Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 5: Checking Junction Block Connector C-210
    G01876319Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Are the connectors and terminals in good condition? 

    1. YES:  Go to Step 4.
    2. NO:  Repair or replace the damaged components.
  4. STEP 4. Check the harness for open circuit or short circuit to ground between the input shaft speed sensor connector B-110 terminal 3 and the junction block connector C-210 terminal 12. 
    Fig 6: Checking Input Shaft Speed Sensor Connector B-110 For Open Or Short Circuit To Ground
    G01876320Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 7: Checking Junction Block Connector C-210 For Open Or Short Circuit To Ground
    G01876321Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the harness wire in good condition? 

    1. YES:  Go to Step 5.
    2. NO:  Repair or replace the harness wire.
  5. STEP 5. Measure the PCM to speed sensor output voltage at the input shaft speed sensor connector B-110. 
    1. Disconnect connector B-110 from the speed sensor and measure voltage at the harness side.
      2. Fig 8: Disconnecting Connector B-110
      G01876322Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Turn the ignition switch to the "ON" position.
    3. Measure the voltage between terminal 2 and ground.
      • The voltage should measure between 4.5 and 4.9 volts.
      Fig 9: Measuring Voltage Between Terminal 2 & Ground
      G01876323Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    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 11 .
    2. NO:  Go to Step 6.
  6. STEP 6. Measure the PCM output voltage to the speed sensor at the PCM connector C-114 by backprobing. 
    Fig 10: Measuring PCM Output Voltage To Speed Sensor At PCM Connector C-114
    G01876324Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    1. Do not disconnect connector C-114.
    2. Disconnect connector B-110 at the input shaft speed sensor.
    3. Turn the ignition switch to the "ON" position.
    4. Measure the voltage between PCM terminal 103 and ground by backprobing.
      • The voltage should measure between 4.5 and 4.9 volts.
      Fig 11: Measuring Voltage Between PCM Terminal 103 & Ground
      G01876325Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    5. 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 7.
    2. NO:  Go to  Step 9 .
  7. STEP 7. Check input shaft speed sensor connector B-110 and PCM connector C-114 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 12: Checking Input Shaft Speed Sensor Connector B-110
    G01876326Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 13: Checking PCM Connector C-114
    G01876327Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Are the connectors in good condition? 

    1. YES:  Go to Step 8.
    2. NO:  Repair or replace the damaged components.
  8. STEP 8. Check the harness for open circuit or damage between input shaft speed sensor connector B-110 terminal 2 and PCM connector C-114 terminal 103. 
    Fig 14: Checking Input Shaft Speed Sensor Connector B-110 For Open Circuit Or Damage
    G01876328Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 15: Checking PCM Connector C-114 For Open Circuit Or Damage
    G01876329Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the harness wire in good condition? 

    1. YES:  Go to  Step 19 .
    2. NO:  Repair or replace the harness wire.
  9. STEP 9. Check input shaft speed sensor connector B-110 and PCM connector C-114 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 16: Checking Input Shaft Speed Sensor Connector B-110
    G01876330Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 17: Checking PCM Connector C-114
    G01876331Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Are the connectors and terminals in good condition? 

    1. YES:  Go to Step 10.
    2. NO:  Repair or replace the damages components.
  10. STEP 10. Check the harness for short circuit to ground between input shaft speed sensor connector B-110 terminal 2 and PCM connector C-114 terminal 103. 
    Fig 18: Checking Input Shaft Speed Sensor Connector B-110 For Short Circuit To Ground
    G01876332Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 19: Checking PCM Connector C-114 For Short Circuit To Ground
    G01876333Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the harness wire in good condition? 

    1. YES:  Go to Step 11.
    2. NO:  Repair or replace the harness wire.
  11. STEP 11. Measure the ground circuit for resistance at the input shaft speed sensor connector B-110. 
    1. Disconnect connector B-110 from the speed sensor and measure at the harness side.
      Fig 20: Disconnecting Connector B-110 From Speed Sensor
      G01876334Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Measure the resistance between terminal 1 and ground.
      • The resistance should measure less than 2 ohms.
      Fig 21: Measuring Resistance Between Terminal 1 & Ground
      G01876335Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the measured resistance less than 2 ohms? 

    1. YES:  Go to  Step 16 .
    2. NO:  Go to Step 12.
  12. STEP 12. Measure the resistance at the PCM connector C-120 by backprobing. 
    Fig 22: Measuring Resistance At PCM Connector C-120
    G01876336Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    1. Do not disconnect connector C-120.
    2. Turn the ignition switch to the "ON" position.
    3. Measure the resistance between terminal 16 and ground by backprobing.
      • The resistance should measure less than 2 ohms.
      Fig 23: Measuring Resistance Between Terminal 16 & Ground
      G01876337Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the measured resistance less than 2 ohms? 

    1. YES:  Go to Step 13.
    2. NO:  Go to  Step 15 .
  13. STEP 13. Check input shaft speed sensor connector B-110 and PCM connector C-120 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 24: Checking Input Shaft Speed Sensor Connector B-110
    G01876338Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 25: Checking PCM Connector C-120
    G01876339Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Are the connectors and terminals in good condition? 

    1. YES:  Go to Step 14.
    2. NO:  Repair or replace the damaged components.
  14. STEP 14. Check the harness for open circuit or damage between input shaft speed sensor harness side connector B-110 terminal 1 and PCM connector C-120 terminal 16. 
    Fig 26: Checking Input Shaft Speed Harness Side Connector B-110 For Open Circuit Or Damage
    G01876340Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 27: Checking PCM Connector C-120 For Open Circuit Or Damage
    G01876341Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is the harness wire in good condition? 

    1. YES:  Go to  Step 16 .
    2. NO:  Repair or replace the harness wire.
  15. STEP 15. Check PCM connector C-120 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 28: Checking PCM Connector C-120 (2 Of 2)
    G01876342Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Are the connector and terminals in good condition? 

    1. YES:  Replace the PCM.
    2. NO:  Repair or replace the damaged components.
  16. STEP 16. Using the oscilloscope, check the input shaft speed sensor waveform at PCM connectors C-120 and 4 by backprobing. 
    1. Do not disconnect connectors C-120 and C-114.
      Fig 29: Identifying Connectors C-114 & C-120
      G01876343Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Connect an oscilloscope probe to PCM connector C-120 terminal 16 and to PCM connector C-114 terminal 103 by backprobing.
      Fig 30: Connecting Oscilloscope Probe To PCM Connector C-120 & C-114
      G01876344Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Start the engine and drive the vehicle at constant speed of 50 km/h (31 mph). (Gear range: 3rd gear)
    4. Check the input shaft speed sensor waveform.
      • The input shaft speed sensor waveform should show a pattern similar to the illustration. The maximum value should be 4.8 volts and more and the minimum value 0.8 volt and less. The output waveform should not contain electrical noise.
      Fig 31: Checking Input Shaft Speed Sensor Waveform
      G01876345Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    5. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the waveform normal? 

    1. YES:  Go to  Step 19 .
    2. NO:  Go to Step 17.
  17. STEP 17. Replace the input shaft speed sensor. 
    1. Replace the input shaft speed sensor. Refer to TRANSAXLE .
      Fig 32: Replacing Input Shaft Speed Sensor
      G01876346Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Test drive the vehicle.
    3. Check for A/T DTC.

    Q: Is A/T DTC 22 set? 

    1. YES:  Go to Step 18.
    2. NO:  The procedure is complete.
  18. STEP 18. Replace the underdrive clutch retainer. 
    1. Replace the underdrive clutch retainer. Refer to REVERSE AND OVERDRIVE CLUTCH .
      Fig 33: Replacing Underdrive Clutch Retainer
      G01876347Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Test drive the vehicle.
    3. Check for A/T DTC.

    Q: Is A/T DTC 22 set? 

    1. YES:  An A/T DTC may have set due to external radio frequency (RFI) possibility caused by cellular phone activity, or aftermarket components installed on the vehicle.
    2. NO:  The procedure is complete.
  19. STEP 19. Using scan tool MB991502, check data list item 22: Input Shaft Speed Sensor. 
    CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
    1. Connect scan tool MB991502 to the data link connector.
      Fig 34: Connecting Scan Tool To Data Link Connector
      G01876348Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    2. Start the engine.
    3. Set scan tool MB991502 to data reading mode for item 22, Input Shaft Speed Sensor.
      • When driving at constant speed of 50 km/h (31 mph), the display should be "1,600 - 1,900 r/min." (Gear range: 3rd gear)
    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.
    2. NO:  Replace the PCM.
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