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DTC P0068: Manifold Pressure/Throttle Position Correlation - High Flow/Vacuum Leak Detected: Testing

NOTE: Diagnose any TP sensor or MAP sensor component DTCs before continuing. If the P0501 No Vehicle Speed Signal is set along with this DTC, refer to the DTC P0501: VEHICLE SPEED SENSOR #1 PERFORMANCE  diagnostics before continuing. The throttle plate and linkage must be free from binding and carbon build-up. Ensure the throttle plate is at the idle position.
  1. Ignition on, engine not running. With the DRBIII® scan tool, read DTCs and record the related freeze frame data. Is the Good Trip Counter displayed and equal to zero? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
    2. NOTE: This code is enabled on engines with a plastic intake manifold and is intended to shut down the engine if a large crack occurs. A large vacuum leak is most likely the cause of this DTC.
  2. Inspect the intake manifold for leaks and cracks. Inspect the power brake booster for any vacuum leaks. Inspect the PCV system for proper operation or any vacuum leaks. Were any vacuum leaks found? If yes, repair the vacuum leak as necessary. If no, go to next step.
  3. Start the engine. With the DRBIII® scan tool, monitor the MAP sensor voltage. Snap the throttle. Does the MAP sensor voltage vary from below 2.0 volts at idle to above 3.5 volts at WOT? If yes, go to next step. If no, go to step  12.
  4. Ignition on, engine not running. With the DRBIII® scan tool, monitor the TP sensor voltage while slowly depressing the throttle pedal from the idle position to the wide open throttle position. Does the voltage start approximately at 0.8 volt and go above 3.5 volts with a smooth transition? If yes, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
    5. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  5. Turn the ignition off. Disconnect the TP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K6) 5-volt supply circuit from the TP sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go on to next step. If no, repair the TP sensor (K6) 5-volt supply circuit.
  6. Turn the ignition off. Disconnect the TP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K6) 5-volt supply circuit at the TP sensor harness connector. Is the resistance above 100 k/ohms? If yes, go to next step. If no, repair the (K6) 5-volt supply circuit.
  7. Turn the ignition off. Disconnect the TP sensor harness connector. Reconnect the PCM harness connectors. With the DRBIII® scan tool, monitor the TP sensor voltage. Ignition on, engine not running. Connect a jumper wire between the (K22) TP signal circuit and the (K4) sensor ground circuit. Does the TP sensor voltage change from approximately 4.9 volts to below 0.5 of a volt? If yes, replace the TP sensor. If no, go to next step.
    8. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  8. Turn the ignition off. Disconnect the TP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K22) TP signal circuit from the TP sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the (K22) TP signal circuit.
  9. Turn the ignition off. Disconnect the TP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K22) TP signal circuit in the TP sensor harness connector. Is the resistance above 100 k/ohms? If yes, go to next step. If no, repair the (K22) TP sensor signal circuit.
    10. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  10. Turn the ignition off. Disconnect the TP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K4) sensor ground circuit from the TP sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the (K4) sensor round circuit.
    11. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  11. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
    12. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  12. Turn the ignition off. Disconnect the MAP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K6) 5-volt supply circuit from the MAP sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the MAP (K6) 5-volt supply circuit.
  13. Turn the ignition off. Disconnect the MAP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K6) 5-volt supply circuit at the MAP sensor harness connector. Is the resistance above 100 k/ohms? If yes, go to next step. If no, repair the short to ground in the (K6) 5-volt supply circuit.
  14. Turn the ignition off. Disconnect the MAP sensor harness connector. Reconnect the PCM harness connectors. With the DRBIII® scan tool, monitor the MAP sensor voltage. Ignition on, engine not running. Connect a jumper wire between the (K1) MAP sensor signal circuit and the (K4) sensor ground circuit. Cycle the ignition switch from off to on. With the DRBIII® scan tool, monitor the MAP sensor voltage. Does the DRBIII® scan tool display MAP voltage from approximately 4.9 volts to below 0.5 volt? If yes, replace the MAP sensor. If no, go to next step.
    15. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  15. Turn the ignition off. Disconnect the MAP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K1) MAP signal circuit from the MAP sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the (K1) MAP signal circuit.
  16. Turn the ignition off. Disconnect the MAP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K1) MAP signal circuit at the MAP sensor harness connector. Is the resistance above 100 k/ohms? If yes, go to next step. If no, repair the (K1) MAP signal circuit.
    17. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  17. Turn the ignition off. Disconnect the MAP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K4) sensor ground circuit from the MAP sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the (K4) sensor ground circuit.
    18. NOTE: Before continuing disconnect the PCM harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
  18. Using the wiring diagram as a guide, inspect the wire harness and connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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