DTC 12: TP Sensor System (Open Circuit): Diagnosis

Required Special Tool:

• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B

1. Using scan tool MB991958, check data list item 11: TP 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.
   Fig 1: Connecting Scan Tool To Data Link Connector

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   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 for item 11: TP Sensor.
      • With the throttle valve in the idle position, voltage should measure between 535 and 735 mV.
      • 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 535 and 735 mV 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 COPE WITH INTERMITTENT MALFUNCTIONS .

      NO : Go to Step 2.

2. Measure the TP sensor output voltage at the TP sensor connector B-07 by backprobing.
   Fig 2: Identifying Terminals Of TP Sensor Connector B-07 (2.4L And 3.0L Engine)

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   1. Do not disconnect connector B-07.
   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 0.535 and 0.735 volts.
      • With the throttle valve in the full-open position, voltage should measure between 4.5 and 5.5 volts.
      Fig 3: Measuring Voltage Between B-07 Connector Terminal 3 And Ground

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

   Q: Is the measured voltage between 0.535 and 0.735 volt at idle, and between 4.5 and 5.5 volts in the full-open position?

   YES : Go to Step 3.

   NO : Go to Step 8.

3. Measure the TP sensor output voltage at PCM connector C-57 < 2.4L Engine> or C-59 < 3.0L Engine> by backprobing.
   Fig 4: Identifying Terminals Of PCM Connector C-57 (2.4L Engine) Or C-59 (3.0L Engine)

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   1. Do not disconnect connector C-57 < 2.4L Engine> or C-59 < 3.0L Engine>.
   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 0.535 and 0.735 volts.
      • With the throttle valve in the full-open position, voltage should measure between 4.5 and 5.5 volts.
   4. Turn the ignition switch to the "LOCK" (OFF) position.
   Fig 5: Measuring Voltage Between Terminal 78 And Ground

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   Q: Is the measured voltage between 0.535 and 0.735 volt at idle, and between 4.5 and 5.5 volts in the full-open position?

   YES : Go to Step 4.

   NO : Go to Step 6.

4. Check TP sensor connector B-07 and PCM connector C-57 < 2.4L Engine> or C-59 < 3.0L Engine> for loose, corroded or damaged terminals, or terminals pushed back in the connector.
   Fig 6: Identifying Terminals Of TP Sensor Connector B-07 (2.4L And 3.0L Engine)

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   Fig 7: Identifying Terminals Of PCM Connector C-57 (2.4L Engine) Or C-59 (3.0L Engine)

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   Q: Are the connectors and terminals in good condition?

   YES : Go to Step 5.

   NO : Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .

5. Using scan tool MB991958, check data list item 11: TP 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.
   Fig 8: Connecting Scan Tool To Data Link Connector

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   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 for item 11: TP Sensor.
      • With the throttle valve in the idle position, voltage should measure between 535 and 735 mV.
      • 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 sensor voltage between 535 and 735 mV 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 COPE WITH INTERMITTENT MALFUNCTIONS .

   NO : Replace the PCM.

6. Check TP sensor connector B-07 and PCM connector C-57 < 2.4L Engine> or C-59 < 3.0L Engine> for loose, corroded or damaged terminals, or terminals pushed back in the connector.
   Fig 9: Identifying Terminals Of TP Sensor Connector B-07 (2.4L And 3.0L Engine)

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   Fig 10: Identifying Terminals Of PCM Connector C-57 (2.4L Engine) Or C-59 (3.0L Engine)

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   Q: Are the connectors and terminals in good condition?

   YES : Go to Step 7.

   NO : Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .

7. Check the harness for open circuit or damage between TP sensor connector B-07 terminal 3 and PCM connector C-57 < 2.4L Engine> or C-59 < 3.0L Engine> terminal 78.
   Fig 11: Identifying Terminals Of TP Sensor Connector B-07 (2.4L And 3.0L Engine)

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   Fig 12: Identifying Terminals Of PCM Connector C-57 (2.4L Engine) Or C-59 (3.0L Engine)

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   Q: Is the harness wire in good condition?

   YES : Go to Step 5.

   NO : Repair or replace the harness wire.

8. Measure the power supply voltage from the PCM at the TP sensor connector B-07 by backprobing.
   Fig 13: Identifying Terminals Of TP Sensor Connector B-07 (2.4L And 3.0L Engine)

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   1. Do not disconnect connector B-07.
   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.
   4. Turn the ignition switch to the "LOCK" (OFF) position.
   Fig 14: Measuring Voltage Between B-07 Connector Terminal 4 And Ground

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

   YES : Go to Step 14.

   NO : Go to Step 9.

9. Measure the power supply voltage at PCM connector C-54 < 2.4L Engine> or C-55 < 3.0L Engine> by backprobing.
   Fig 15: Identifying Terminals Of PCM Connector C-54 (2.4L Engine) Or C-55 (3.0L Engine)

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   1. Do not disconnect connector C-54 < 2.4L Engine> or C-55 < 3.0L Engine>.
   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.
   4. Turn the ignition switch to the "LOCK" (OFF) position.
   Fig 16: Measuring Voltage Between Terminal 46 And Ground

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

   YES: Go to Step 10.

   NO: Go to Step 12.

10. Check TP sensor connector B-07 and PCM connector C-54 < 2.4L Engine> or C-55 < 3.0L Engine> for loose, corroded or damaged terminals, or terminals pushed back in the connector.
    Fig 17: Identifying Terminals Of TP Sensor Connector B-07 (2.4L And 3.0L Engine)

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    Fig 18: Identifying Terminals Of PCM Connector C-54 (2.4L Engine) Or C-55 (3.0L Engine)

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    Q: Are the connectors and terminals in good condition?

    YES : Go to Step 11.

    NO : Repair or replace the defective components. Refer to HARNESS CONNECTOR INSPECTION .

11. Check the harness for open circuit or damage between TP sensor connector B-07 terminal 4 and PCM connector C-54 < 2.4L Engine> or C-55 < 3.0L Engine> terminal 46.
    Fig 19: Identifying Terminals Of TP Sensor Connector B-07 (2.4L And 3.0L Engine)

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    Fig 20: Identifying Terminals Of PCM Connector C-54 (2.4L Engine) Or C-55 (3.0L Engine)

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    Q: Is the harness wire in good condition?

    YES : Go to Step 5.

    NO : Repair or replace the harness wire.

12. Check TP sensor connector B-07 and PCM connector C-114 < 2.4L Engine> or C-115 < 3.0L Engine> for loose, corroded or damaged terminals, or terminals pushed back in the connector.
    Fig 21: Identifying Terminals Of TP Sensor Connector B-07 (2.4L And 3.0L Engine)

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    Fig 22: Identifying Terminals Of PCM Connector C-54 (2.4L Engine) Or C-55 (3.0L Engine)

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    Q: Are the connectors and terminals in good condition?

    YES : Go to Step 13.

    NO : Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .

13. Check the harness for a short circuit to ground between TP sensor connector B-07 terminal 4 and PCM connector C-54 < 2.4L Engine> or C-55 < 3.0L Engine> terminal 46.
    Fig 23: Identifying Terminals Of TP Sensor Connector B-07 (2.4L And 3.0L Engine)

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    Fig 24: Identifying Terminals Of PCM Connector C-54 (2.4L Engine) Or C-55 (3.0L Engine)

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    Q: Is the harness wire in good condition?

    YES : Go to Step 5.

    NO : Repair or replace the harness wire.

14. Check TP sensor connector B-07 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
    Fig 25: Identifying Terminals Of TP Sensor Connector B-07 (2.4L And 3.0L Engine)

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    Q: Are the connector and terminals in good condition?

    YES: Go to Step 15.

    NO : Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .

15. Check the TP sensor.
    1. Disconnect connector B-07 and measure at the TP sensor side.
    Fig 26: Identifying Terminals Of TP Sensor Connector B-07 (2.4L And 3.0L Engine)
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    2. Measure the resistance between the TP sensor connector terminals 1 and 4.

       Standard value: 3.5 - 6.5 kΩ

       Fig 27: Measuring Resistance Between TP Sensor Connector Terminals 1 And 4

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    3. Measure the resistance between the TP sensor connector terminals 1 and 3
    4. Move the throttle valve from the idle position to full-open position.
    • The resistance should change smoothly in proportion to the opening angle of the throttle valve.
    Fig 28: Measuring Resistance Between TP Sensor Connector Terminals 1 And 3

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    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 16.

    NO : Replace the TP sensor. Refer to THROTTLE BODY ASSEMBLY < 2.4L Engine> or THROTTLE BODY ASSEMBLY < 3.0L Engine> .

16. Check PCM connectors C-54 < 2.4L Engine> or C-55 < 3.0L Engine> and C-57 < 2.4L Engine> or C-59 < 3.0L Engine> for loose, corroded or damaged terminals, or terminals pushed back in the connector.
    Fig 29: Identifying Terminals Of PCM Connector C-57 (2.4L Engine) Or C-59 (3.0L Engine) And Connector C-54 (2.4L Engine) Or C-55 (3.0L Engine)

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    Q: Are the connectors and terminals in good condition?

    YES: Go to Step 17.

    NO : Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .

17. Check the harness for a short circuit to ground or damage between TP sensor connector B-07 terminal 3 and PCM connector C-57 < 2.4L Engine> or C-59 < 3.0L Engine> terminal 78.
    Fig 30: Identifying Terminals Of TP Sensor Connector B-07 (2.4L And 3.0L Engine)

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    Fig 31: Identifying Terminals Of PCM Connector C-57 (2.4L Engine) Or C-59 (3.0L Engine)

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    Q: Is the harness wire in good condition?

    YES: Go to Step 18.

    NO : Repair or replace the harness wire.

18. Check the TP sensor connector and harness for a short circuit to ground between the TP sensor 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 ADJUSTMENT < 2.4L Engine> or THROTTLE POSITION SENSOR ADJUSTMENT < 3.0L Engine> .

    NO : Repair or replace the damaged components.