1999 Chevrolet Cutaway 7.4 JFACTORY 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 allow it to idle. Using scan tool, monitor MAF frequency. If MAF frequency is less than 1200 Hz, go to step  4. If MAF frequency is not as specified, go to next step.
  3. Turn ignition off. Wait for 15 seconds. Turn ignition on. Using scan tool, review and record FAILURE RECORDS data. Clear DTCs. Operate vehicle within FAILURE RECORDS conditions. Monitor SPECIFIC DTC INFO and select DTC P0102. If scan tool indicates FAILED THIS IGN, go to next step. If scan tool does not indicate FAILED THIS IGN, see DIAGNOSTIC AIDS .
  4. Check for air leaks at MAF sensor, throttle body spacer, intake manifold, PCV system and EGR system. Check for restriction in MAF sensor inlet and duct work. Check operation of PCV system. Repair as necessary. After repairs, go to step  14. If no problems are found, go to next step.
  5. Turn ignition off. Disconnect MAF sensor connector. Turn ignition on, with engine off. Using DVOM, measure voltage between battery ground and signal circuit terminal at MAF sensor harness connector. If voltage is about 5 volts, go to next step. If voltage is not as specified, go to step  9.
  6. Connect a test light between ignition feed circuit and ground circuit terminals at MAF sensor harness connector. If test light illuminates, go to step  8. If test light does not illuminate, go to next step.
  7. Connect a test light between ground and ignition feed circuit terminal at MAF sensor harness connector. If test light illuminates, go to step  10. If test light does not illuminate, go to step  11.
  8. Check for poor connection at MAF sensor connector. Repair as necessary. After repairs, go to step  14. If connection is okay, go to step  12.
  9. Check MAF sensor signal circuit between PCM and MAF sensor for an open, short to voltage, short to ground, or short to MAF ground circuit. Repair as necessary. After repairs, go to step  14. If circuit is okay, go to step  13.
  10. Locate and repair open in MAF sensor ground circuit. After repairs, go to step  14.
  11. Locate and repair open in MAF sensor ignition feed circuit. After repairs, go to step  14.
  12. Replace MAF sensor. After repairs, go to step  14.
  13. Replace PCM. Perform PCM reprogramming procedures. After repairs, go to next step.
  14. Using scan tool, 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 P0102. If scan tool indicates FAILED THIS IGN, go to step  2. If scan tool does not indicate FAILED THIS IGN, go to next step.
  15. Review CAPTURED INFO on scan tool. 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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