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Map Sensor Circuit: 2.2L

  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. Install scan tool and retrieve DTCs. If no MAP sensor related DTCs are set, go to next step. If any MAP sensor related DTCs are set, perform appropriate DTC test. See appropriate SELF-DIAGNOSTICS article.
  3. Turn ignition on with engine off. Compare MAP sensor reading with that of a known-good vehicle. If voltage readings are within 0.4 volt of each other, go to next step. If voltage readings are not within 0.4 volt of each other, go to step  5.
  4. Disconnect and plug vacuum source to MAP sensor. Connect a hand-held vacuum pump to vacuum source port on MAP sensor. Apply 10 in. Hg of vacuum to MAP sensor while observing MAP sensor reading on scan tool. Subtract this reading from the reading obtained in step  3. If difference is greater than 1.5 volts, go to step  6. If difference is not greater than 1.5 volts, go to step  7.
  5. Replace MAP sensor. After repairs, go to step  9.
  6. Check MAP sensor vacuum source for leakage or restriction, and that vacuum source only supplies MAP sensor. If problem exists, go to step  8. If problem does not exist, go to step  9.
  7. Check for poor connection at MAP sensor. If poor connection does not exist, go to step  5. If poor connection exists, repair as necessary and go to step  9.
  8. Repair leak or restriction in MAP sensor vacuum source as necessary. After repairs, go to next step.
  9. Operate vehicle under conditions which original symptom was noted. If system operates properly, system is okay at this time. If system does not operate properly, go to step  2.
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