1999 Saturn SL2 Automatic, MP6FACTORY OEM SERVICE PROCEDURE

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
  2. Start engine and let idle. Using scan tool, monitor MAF frequency. If MAF frequency is greater than 11,500 Hz, go to step  4. If MAF frequency is not as specified, go to next step.
  3. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Start engine and operate vehicle as close to conditions recorded in FREEZE FRAME as possible. Select SPECIFIC DTC function then enter DTC P0103. If scan tool indicates FAILED THIS IGN, go to next step. If scan tool does not indicate FAILED THIS IGN, see DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect MAF sensor harness connector. Start engine. Using scan tool, monitor MAF frequency. If frequency is zero Hz, go to next step. If frequency is not zero Hz, go to step  7.
  5. Check for poor connection at MAF sensor connector. Repair as necessary. After repairs, go to step  10. If connector is okay, go to next step.
  6. Replace MAF sensor. After repairs, go to step  10.
  7. Check for incorrect routing of MAF sensor wiring harness. Ensure harness is not near ignition coils or other high-voltage components. Reroute wiring harness as necessary. After repairs, go to step  10. If wiring harness is routed correctly, go to next step.
  8. Check MAF signal circuit terminal connections at PCM. Repair as necessary. After repairs, go to step  10. If terminal connections are okay, go to next step.
  9. Replace PCM. Program replacement PCM using required equipment. After repairs, go to next step.
  10. Using scan tool, select CLEAR INFO or CLEAR DTCS function to clear DTCs. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Start engine and operate vehicle as close to conditions recorded in FREEZE FRAME as possible. Monitor SPECIFIC DTC info for DTC P0103. If scan tool indicates FAILED THIS IGN, go to step  2. If scan tool does not indicate FAILED THIS IGN, go to next step.
  11. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. If no undiagnosed DTCs are displayed, system is okay.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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