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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Engine Controls Self-Diagnostics - 5.0L & 5.7L) >> Diagnostic Tests >> DTC P0102: MAF Sensor Circuit - Low Frequency >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2001 GMC Savana, 2001 Chevrolet RV Cutaway, 2001 Chevrolet Cutaway, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing powertrain diagnostic system check, go to next step.
  2. Install scan tool. Start engine. Using scan tool, observe MAF sensor frequency parameter. If scan tool indicates MAF sensor frequency is less than 10 Hz, go to step  4. If scan tool does not indicate MAF sensor frequency is less than 10 Hz, go to next step.
  3. Observe FREEZE FRAME/FAILURE RECORDS data for this DTC. Turn ignition off for 30 seconds. Start engine. Operate vehicle within code enable criteria or as close to FREEZE FRAME/FAILURE RECORDS data as possible. If DTC failed this ignition cycle, go to next step. If DTC did not fail this ignition cycle, see DIAGNOSTIC AIDS .
  4. Inspect fuse that supplies ignition 1 voltage circuit of MAF sensor. If fuse is open, go to step  14. If fuse is not open, go to next step.
  5. Turn ignition off. Disconnect MAF sensor connector. MAF sensor is located at air cleaner. Turn ignition on, engine off. Measure voltage between MAF sensor connector terminal "A" (Yellow wire) and ground. See Figure. If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, go to step  8.
  6. Turn ignition off. Connect a fused jumper wire (3-amp) between MAF sensor connector terminal "A" (Yellow wire) and ground. Start engine. If any additional DTCs set, go to step  16. If no additional DTCs set, go to next step.
  7. Turn ignition off. Connect a test light between MAF sensor connector terminals "B" (Black/White wire) and "C" (Pink wire). Turn ignition on, engine off. If test light is on, go to step  18. If test light is off, go to step  11.
  8. If voltage is less than 4.5 volts, go to step  10. If voltage is not less than 4.5 volts, go to next step.
    9. NOTE: Disconnecting PCM connectors may eliminate short to voltage if signal circuit is shorted to another PCM circuit.
  9. Turn ignition off. Disconnect PCM. Turn ignition on, engine off. Measure voltage between MAF sensor connector terminal "A" (Yellow wire) and ground. If voltage is zero volts, go to step  12. If voltage is not zero volts, go to step  15.
  10. Turn ignition off. Disconnect PCM. Check Yellow wire between PCM and MAF sensor for high resistance, open, short to ground or short to ground circuit of MAF sensor. If problem was found, repair as necessary. After repairs, go to step  22. If problem was not found, go to step  12.
  11. Connect a test light between MAF sensor connector terminal "C" (Pink wire) and ground. If test light is on, go to step  13. If test light is off, go to step  14.
  12. Check for continuity between PCM Red connector C2 terminal No. 31 (Yellow wire) and all other terminals of both PCM connectors. See Figure. If continuity exists between any other circuit, go to step  17. If continuity does not exist between any other circuit, go to step  19.
  13. Repair high resistance or open in Black/White wire between MAF sensor and ground. After repairs, go to step  22.
    14. NOTE: Ignition 1 voltage circuit of MAF sensor is spliced to other components on vehicle.
  14. Check Pink wire between PCM and fuse block for short to ground or open. If problem was found, repair as necessary. After repairs, go to step  22. If problem was not found, go to step  20.
  15. Repair short to voltage in Yellow wire between MAF sensor and PCM. After repairs, go to step  22.
  16. Repair short between Yellow wire and circuit for which DTC set. After repairs, go to step  22.
  17. Repair circuits that are shorted together. After repairs, go to step  22.
  18. Check MAF sensor connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  22. If problem was not found, go to step  20.
  19. Check PCM connectors for poor connections. If problem was found, repair as necessary. After repairs, go to step  22. If problem was not found, go to step  21.
  20. Replace MAF sensor. After repairs, go to step  22.
  21. Replace PCM. Program PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  22. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within code enable criteria. If DTC runs and passes, go to next step. If DTC does not run and pass, go to step  2.
  23. Using scan tool, observe stored information. If scan tool displays any DTCs that have not been diagnosed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not display any DTCs, system is okay.
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