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Map Sensor Circuit: 3.4L

  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing powertrain diagnostic system check, go to next step.
  2. Check for the following:
    • Missing or damaged MAP sensor seal.
    • Damage, disconnected or misrouted vacuum hoses.
    • Intake manifold vacuum leaks.
    • Vacuum leaks at throttle body.
    • Vacuum leaks in EGR system.
    • Faulty, missing or incorrectly installed PCV valve.

    If a problem does not exist, go to next step. If a problem exists, repair as necessary and go to step  14.

  3. Disconnect MAP sensor harness connector. Using scan tool, observe MAP sensor parameter. If zero volts is displayed, go to next step. If zero volts is not displayed, go to step  12.
  4. Using a test light connected to battery voltage, probe MAP sensor signal circuit (Light Green wire) at MAP sensor harness connector. See WIRING DIAGRAMS article. Observe MAP sensor parameter on scan tool. If 4.95 volts is displayed, go to next step. If 4.95 volts is not displayed, go to step  8.
  5. Using a fused jumper wire, connect MAP sensor signal circuit (Light Green wire) and MAP sensor reference voltage circuit (Gray wire) at MAP sensor harness connector. See WIRING DIAGRAMS article. Observe MAP sensor parameter on scan tool. If scan tool displays 4.95 volts, go to next step. If scan tool does not display 4.95 volts, go to step  7.
  6. Turn ignition off. Disconnect PCM harness connectors. Check MAP sensor ground circuit (Orange/Black wire) for open, high resistance or poor connection at PCM. If problem does not exist, go to step  10. If problem exists, repair as necessary and go to step  14.
  7. Check MAP sensor reference voltage circuit (Gray wire) for open, high resistance or poor connection at PCM. If problem does not exist, go to step  9. If problem exists, repair as necessary and go to step  14.
  8. Turn ignition off. Disconnect PCM harness connectors. Check MAP sensor signal circuit (Light Green wire) for open, high resistance, short to ground or short to sensor. If problem does not exist, go to next step. If problem exists, repair as necessary and go to step  14.
  9. Check MAP sensor signal circuit (Light Green wire) for poor connection at PCM. If problem does not exist, go to step  13. If problem exists, repair as necessary and go to step  14.
  10. Check for poor connection at MAP sensor. If problem does not exist, go to next step. If problem exists, repair as necessary and go to step  14.
  11. Replace MAP sensor. After repairs, go to step  14.
  12. Turn ignition off. Disconnect PCM harness connector. Turn ignition on. Check MAP sensor signal circuit (Light Green) for a short to voltage or short to MAP sensor reference voltage circuit (Gray wire). If problem does not exist, go to next step. If problem exists, repair as necessary and go to step  14.
  13. Replace PCM. Program PCM. Perform VTD password relearn procedure and crankshaft variation learn procedure. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. After repairs, go to next step.
  14. Start engine and let idle. While observing MAP sensor parameter on scan tool, increase engine RPM. If MAP sensor value changes, system is okay. If MAP sensor value does not change, go to step  2.
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