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2.2L (Cavalier & Sunfire) & 2.4L

  1. Turn ignition on, with engine off. Install scan tool. Using scan tool, retrieve DTCs. If no DTCs are set, go to next step. If any DTCs are set, perform appropriate DTC test. See appropriate SELF-DIAGNOSTICS article.
  2. Compare BARO reading with that of a known-good vehicle. If readings are within.435 psi (3 kPa) of each other, go to next step. If readings are not within.435 psi (3 kPa) of each other, go to step  4.
  3. Disconnect and plug vacuum source to MAP sensor. Connect hand-held vacuum pump to vacuum source port on MAP sensor. Using scan tool, observe MAP sensor voltage reading. Apply 10 in. Hg of vacuum to MAP sensor while observing MAP sensor voltage reading on scan tool. Subtract this reading from the first reading taken before vacuum was applied. If difference is greater than 1.5 volts, go to step  5. If difference is not greater than 1.5 volts, go to step  6.
  4. Turn ignition off. Replace MAP sensor. After repairs, go to step  8.
  5. Check MAP sensor vacuum source for leakage or restriction, and that vacuum source only supplies MAP sensor. If problem exists, go to step  7. If problem does not exist, go to step  8.
  6. Turn ignition off. Check for poor connection at MAP sensor. If problem does not exist, go to step  4. If problem exists, repair as necessary and go to step  8.
  7. Turn ignition off. Repair MAP sensor vacuum source as necessary and go to next step.
  8. Start engine and operate vehicle under conditions which original symptom was noted. If system operates properly, system is okay. If system does not operate properly, go to step  1.
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