DTC 14: TP Sensor System (Maladjusted Sensor): Diagnosis

Required Special Tool: 

• MB991502: Scan Tool (MUT-II)

1. STEP 1. Using scan tool MB991502, read the A/T diagnostic trouble code. 
   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 MB991502 To Data Link Connector

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   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 A/T DTC 11 or 12 set? 

   YES:  Refer to DTC 11: TP SENSOR SYSTEM (SHORT CIRCUIT)  or DTC 12: TP SENSOR SYSTEM (OPEN CIRCUIT) .

   NO:  Go to Step 2.

2. STEP 2. Using scan tool MB991502, check data list item 11: TP Sensor. 
   1. Connect scan tool MB991502 to the data link connector.
      Fig 2: Connecting Scan Tool MB991502 To Data Link Connector

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   2. Turn the ignition switch to the "ON" position.
   3. Set scan tool MB991502 to data-reading mode for item 11, TP Sensor.
      • With the throttle valve in the idle position, voltage should measure between 300 and 1,000 mV <3.0L Engine>, 535 and 735 mV <3.5L Engine>.
      • With the throttle valve in the full-open position, voltage should measure between 4,500 and 5,500 mV.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the measured voltage between 300 and 1,000 mV <3.0L Engine> or 535 and 735mV <3.5L Engine> at idle, and between 4,500 and 5,500 mV in the full-open position? 

   YES:  It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .

   NO:  Go to Step 3.

3. STEP 3. Measure the TP sensor output voltage at TP sensor connector A-41 by backprobing. 
   1. Do not disconnect connector A-41.
      Fig 3: Locating TP Sensor Connector A 41 & Terminal Identification

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   2. Turn the ignition switch to the "ON" position.
   3. Measure the voltage between terminal 3 and ground by backprobing.
      • With the throttle valve in the idle position, voltage should measure between 0.3 and 1.0 volt <3.0L Engine>, 0.535 and 0.735 volt <3.5L Engine>.
      • With the throttle valve in the full-open position, voltage should measure between 4.5 and 5.5 volts.
      Fig 4: Measuring Voltage Between Terminal 3 And Ground By Backprobing

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   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the measured voltage between 0.3 and 1.0 volt <3.0L Engine> or 0.535 and 0.735 volt <3.5L Engine> at idle, and between 4.5 and 5.5 volts in the full-open position? 

   YES:  Go to Step 4.

   NO:  Go to Step  9.

4. STEP 4. Measure the TP sensor output voltage at PCM connector C-91 by backprobing. 
   1. Do not disconnect connector C-91.
      Fig 5: Locating PCM Connector C 91 & Terminal Identification

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   2. Turn the ignition switch to the "ON" position.
   3. Measure the voltage between terminal 78 and ground by backprobing.
      • With the throttle valve in the idle position, voltage should measure between 0.3 and 1.0 volt <3.0L Engine>, 0.535 and 0.735 volt <3.5L Engine>.
      • With the throttle valve in the full-open position, voltage should measure between 4.5 and 5.5 volts.
      Fig 6: Measuring Voltage Between Terminal 78 And Ground By Backprobing

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   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the measured voltage between 0.3 and 1.0 volt <3.0L Engine> or 0.535 and 0.735 volt <3.5L Engine> at idle, and between 4.5 and 5.5 volts in the full-open position? 

   YES:  Go to Step 5.

   NO:  Go to Step  7.

5. STEP 5. Check TP sensor connector A-41 and PCM connector C-91 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
   Fig 7: Locating TP Sensor Connector A 41 & Terminal Identification

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   Fig 8: Locating PCM Connector C 91 & Terminal Identification

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   Q: Are the connectors and terminals in good condition? 

   YES:  Go to Step 6.

   NO:  Repair or replace the damaged components. Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .

6. STEP 6. Using scan tool MB991502, check data list item 11: TP Sensor. 
   CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
   1. Connect scan tool MB991502 to the data link connector.
      Fig 9: Connecting Scan Tool MB991502 To Data Link Connector

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   2. Turn the ignition switch to the "ON" position.
   3. Set scan tool MB991502 to data-reading mode for item 11, TP Sensor.
      • With the throttle valve in the idle position, voltage should measure between 300 and 1,000 mV <3.0L Engine>, 535 and 735 mV <3.5L Engine>.
      • With the throttle valve in the full-open position, voltage should measure between 4,500 and 5,500 mV.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the measured voltage between 300 mV and 1,000 mV <3.0L Engine> or 535 and 735 mV <3.5L Engine> at idle, and between 4,500 and 5,500 mV in the full-open position? 

   YES:  It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .

   NO:  Replace the PCM.

7. STEP 7. Check TP sensor connector A-41 and PCM connector C-91 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
   Fig 10: Locating TP Sensor Connector A 41 & Terminal Identification

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   Fig 11: Locating PCM Connector C 91 & Terminal Identification

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   Q: Are the connectors and terminals in good condition? 

   YES:  Go to Step 8.

   NO:  Repair or replace the damaged components. Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .

8. STEP 8. Check the harness for open circuit or damage between TP sensor connector A-41 terminal 3 and PCM connector C-91 terminal 78. 
   Fig 12: Locating TP Sensor Connector A 41 & Terminal Identification

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   Fig 13: Locating PCM Connector C 91 & Terminal Identification

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   Q: Is the harness wire in good condition? 

   YES:  Go to Step  6.

   NO:  Repair or replace the harness wire.

9. STEP 9. Measure the power supply voltage from the PCM at the TP sensor connector A-41 by backprobing. 
   1. Do not disconnect connector A-41.
      Fig 14: Locating TP Sensor Connector A 41 & Terminal Identification

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   2. Turn the ignition switch to the "ON" position.
   3. Measure the voltage between terminal 4 and ground by backprobing.
      • The voltage should measure between 4.9 and 5.1 volts.
      Fig 15: Measuring Voltage Between Terminal 4 And Ground By Backprobing

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   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the measured voltage between 4.9 and 5.1 volts? 

   YES:  Go to Step  15.

   NO:  Go to Step 10.

10. STEP 10. Measure the power supply voltage at PCM connector C-90 by backprobing. 
    1. Do not disconnect connector C-90.
       Fig 16: Locating PCM Connector C 90 & Terminal Identification

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    2. Turn the ignition switch to the "ON" position.
    3. Measure the voltage between terminal 46 and ground by backprobing.
       • The voltage should measure between 4.9 and 5.1 volts.
       Fig 17: Measuring Voltage Between Terminal 46 And Ground By Backprobing

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    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the measured voltage between 4.9 and 5.1 volts? 

    YES:  Go to Step 11.

    NO:  Go to Step  13.

11. STEP 11. Check TP sensor connector A-41 and PCM connector C-90 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 18: Locating TP Sensor Connector A 41 & Terminal Identification

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    Fig 19: Locating PCM Connector C 90 & Terminal Identification

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    Q: Are the connectors and terminals in good condition? 

    YES:  Go to Step 12.

    NO:  Repair or replace the damaged components. Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .

12. STEP 12. Check the harness for open circuit or damage between TP sensor connector A-41 terminal 4 and PCM connector C-90 terminal 46. 
    Fig 20: Locating TP Sensor Connector A 41 & Terminal Identification

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    Fig 21: Locating PCM Connector C 90 & Terminal Identification

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    Q: Is the harness wire in good condition? 

    YES:  Go to Step  6.

    NO:  Repair or replace the harness wire.

13. STEP 13. Check TP sensor connector A-41 at and PCM connector C-90 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 22: Locating TP Sensor Connector A 41 & Terminal Identification

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    Fig 23: Locating PCM Connector C 90 & Terminal Identification

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    Q: Are the connectors and terminals in good condition? 

    YES:  Go to Step 14.

    NO:  Repair or replace the damaged components. Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .

14. STEP 14. Check harness for a short circuit to ground between TP sensor connector A-41 terminal 4 and PCM connector C-90 terminal 46. 
    Fig 24: Locating TP Sensor Connector A 41 & Terminal Identification

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    Fig 25: Locating PCM Connector C 90 & Terminal Identification

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    Q: Is the harness wire in good condition? 

    YES:  Go to Step  6.

    NO:  Repair or replace the harness wire.

15. STEP 15. Measure the ground voltage at TP sensor connector A-41 by backprobing. 
    1. Do not disconnect connector A-41.
       Fig 26: Locating TP Sensor Connector A 41 & Terminal Identification

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    2. Turn the ignition switch to the "ON" position.
    3. Measure the voltage between terminal 1 and ground by backprobing.
       • The voltage should measure 0.5 volt or less.
       Fig 27: Measuring Voltage Between Terminal 1 And Ground By Backprobing

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    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the measured voltage 0.5 volt or less? 

    YES:  Go to Step  20.

    NO:  Go to Step 16.

16. STEP 16. Measure the ground voltage at PCM connector C-90 by backprobing. 
    1. Do not disconnect connector C-90.
       Fig 28: Locating PCM Connector C 90 & Terminal Identification

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    2. Turn the ignition switch to the "ON" position.
    3. Measure the voltage between terminal 57 and ground by backprobing.
       • The voltage should measure 0.5 volt or less.
       Fig 29: Measuring Voltage Between Terminal 57 And Ground By Backprobing

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    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the measured voltage 0.5 volt or less? 

    YES:  Go to Step 17.

    NO:  Go to Step  19.

17. STEP 17. Check TP sensor connector A-41, joint connector C-71 and PCM connector C-90 at for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 30: Locating TP Sensor Connector A 41 & Terminal Identification

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    Fig 31: Locating Joint Connector C 71 & Terminal Identification

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    Fig 32: Locating PCM Connector C 90 & Terminal Identification

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    Q: Are the connectors and terminals in good condition? 

    YES:  Go to Step 18.

    NO:  Repair or replace the damaged components. Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .

18. STEP 18. Check the harness for open circuit or damage between TP sensor connector A-41 terminal 1 and PCM connector C-90 terminal 57. 
    Fig 33: Locating TP Sensor Connector A 41 & Terminal Identification

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    Fig 34: Locating PCM Connector C 90 & Terminal Identification

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    Q: Is the harness wire in good condition? 

    YES:  Go to Step  6.

    NO:  Repair or replace the harness wire.

19. STEP 19. Check PCM connector C-90 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 35: Locating PCM Connector C 90 & Terminal Identification

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    Q: Are the connector and terminals in good condition? 

    YES:  Go to Step  6.

    NO:  Repair or replace the damaged components. Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .

20. STEP 20. Check TP sensor connector A-41 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 36: Locating TP Sensor Connector A 41 & Terminal Identification

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    Q: Are the connector and terminals in good condition? 

    YES:  Go to Step 21.

    NO:  Repair or replace the damaged components. Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .

21. STEP 21. Check the TP sensor. 
    1. Disconnect connector A-41 and measure at the TP sensor side.
       Fig 37: Locating TP Sensor Connector A 41 & Terminal Identification

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    2. Measure the resistance between terminal 1 and 4.

       Specified resistance: 3.5 - 6.5 kΩ 

       Fig 38: Measuring Resistance Between Terminal 1 And 4

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    3. Measure resistance between the TP sensor side connector terminal 1 and 3.
       Fig 39: Measuring Resistance Between The TP Sensor Side Connector Terminal 1 And 3

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    4. Move the throttle valve from the idle position to the full-open position.
       • The resistance should change smoothly in proportion to the opening angle of the throttle valve.

    Q: Does the resistance change smoothly between 3.5 - 6.5 kΩ in proportion to the opening angle of the throttle valve? 

    YES:  Go to Step 22.

    NO:  Replace the TP sensor. Refer to Throttle Body Assembly .

22. STEP 22. Check PCM connectors C-90 and C-91 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 
    Fig 40: Locating PCM Connector C 90 And C 91 & Terminal Identification

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    Q: Are the connectors and terminals in good condition? 

    YES:  Go to Step 23.

    NO:  Repair or replace the damaged components. Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .

23. STEP 23. Check harness for a short circuit to ground or damage between TP sensor connector A-41 terminal 3 and PCM connector C-91 terminal 78. 
    Fig 41: Locating TP Sensor Connector A 41 & Terminal Identification

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    Fig 42: Locating PCM Connector C 91 & Terminal Identification

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    Q: Is the harness wire in good condition? 

    YES:  Go to Step 24.

    NO:  Repair or replace the harness wire.

24. STEP 24. Check the TP sensor connector and harness for a short circuit to ground between the TP sensor connector and the auto-cruise control-ECU connector. 

    Q: Are the connector and harness wire in good condition? 

    YES:  Adjust the TP sensor. Refer to THROTTLE POSITION SENSOR & CLOSED THROTTLE POSITION SWITCH .

    NO:  Repair or replace the damaged components.