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HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 2 (ENGINE CONTROLS - TESTS W/CODES - 5.7L)DIAGNOSTIC TROUBLE CODESDTC P0102 - MAF SENSOR CIRCUIT LOW FREQUENCYDIAGNOSTIC PROCEDURES
1998 Chevrolet Suburban K2500, 7.4 J, Part Time

Diagnostic Procedures

1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Diagnostic Procedures
WARNING: This page is about a different variant/trim than selected.
  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Install scan tool. Start engine. With engine at idle, monitor MAF display on scan tool. If MAF display is less than 2 gm/s, go to step 4). If MAF display is not less than 2 gm/s, go to next step.
  3. Turn ignition on, engine off. Using scan tool, review and record FAILURE RECORDS data. Operate vehicle within FAILURE RECORDS conditions. Using scan tool, monitor SPECIFIC DTC for this DTC. If scan tool indicates that this DTC FAILED THIS IGN, go to next step. If scan tool does not indicate that this DTC FAILED THIS IGN, see DIAGNOSTIC AIDS.
  4. Check MAF fuse. If fuse is blown, go to step 11). If fuse is okay, go to next step.
  5. Check for the following conditions:
    • Objects blocking MAF sensor inlet screen.
    • Intake manifold vacuum leaks.
    • Vacuum leaks at throttle body.
    • Vacuum leaks at EGR valve flange and pipes.
    • Crankcase ventilation valve faulty, missing or incorrectly installed.

    Repair as necessary. After repairs, go to step 16). If no problem is found, go to next step.

  6. Turn ignition off. Disconnect MAF sensor connector. Turn ignition on, engine off. Using DVOM, check voltage between MAF signal circuit of MAF sensor connector and ground. If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, go to step 10).
  7. Connect test light between MAF ignition feed and ground circuits at MAF sensor connector. If test light illuminates, go to step 9). If test light does not illuminate, go to next step.
  8. Connect test light between MAF ignition feed circuit at MAF sensor connector and battery ground. If test light illuminates, go to step 12). If test light does not illuminate, go to step 13).
  9. Check for poor connection at MAF sensor. Repair as necessary. After repairs, go to step 16). If connection is okay, go to step 14).
  10. Check for open, short to ground, short to MAF ground circuit or short to voltage in MAF signal circuit between MAF sensor and VCM. Repair as necessary. If MAF signal circuit is open or shorted, go to step 16). If MAF signal circuit is not open or shorted, go to step 15).
  11. Locate and repair short to ground in MAF sensor ignition voltage circuit. After repairs, go to step 16).
  12. Locate and repair open in MAF sensor ground circuit to MAF sensor. After repairs, go to step 16).
  13. Locate and repair open in ignition feed circuit to MAF sensor. After repairs, go to step 16).
  14. Replace MAF sensor. After replacing sensor, go to step 16).
  15. Replace VCM. Program replacement VCM using required equipment. After replacing and reprogramming VCM, go to next step.
  16. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2).
  17. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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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.