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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0102: Mass Airflow Sensor Circuit Low Frequency >> Diagnostic Procedures

Diagnostic Procedures

  1. If powertrain diagnostic system check was performed, go to next step. If powertrain diagnostic system check was not performed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under DIAGNOSTIC SYSTEM CHECKS. After performing powertrain diagnostic system check, go to next step.
  2. Start and operate engine at idle. Using scan tool, monitor MAF sensor frequency display. If MAF sensor value is less than 800 Hz, go to step  4. If MAF sensor value 800 Hz or more, go to next step.
  3. Turn ignition on. Using scan tool, review FREEZE FRAME and/or FAILURE RECORDS data and note parameters. Turn ignition off for 30 seconds. Start engine and operate vehicle within conditions required for this DTC to run in code enable criteria, or as close to conditions recorded in FREEZE FRAME/FAILURE RECORDS as possible. Select DTC function, and then enter this DTC. If scan tool indicates that DTC failed this ignition, go to next step. If scan tool does not indicate that this test failed this ignition, see DIAGNOSTIC AIDS .
  4. Check ENG SEN fuse (20-amp) located in bottom underhood fuse block. See Figure and Figure . If fuse is open, go to step  14. If fuse is okay, go to next step.
  5. Turn ignition off. Disconnect MAF sensor connector. Turn ignition on. Using DVOM, measure voltage between MAF sensor terminal "A" (Yellow wire) circuit and ground. If voltage reading is about 5 volts, go to next step. If voltage reading is not about 5 volts, go to step  8.
  6. Turn ignition off. Connect a 3-amp fused jumper wire between ground and MAF sensor terminal "A" (Yellow wire). Start engine. Check for DTCs. If additional DTCs set, go to step  16. If no additional DTCs set, go to next step.
  7. Turn ignition off. Connect test light between MAF sensor terminal "C" (Pink wire) and terminal "B" (Black/White wire). Turn ignition on. If test light illuminates, go to step  18. If test light does not illuminate, go to step  11.
  8. If voltage is less than 4.5 volts, go to step  10. If voltage is 4.5 volts or more, go to next step.
  9. Turn ignition off. Disconnect PCM connectors. Turn ignition on. Using DVOM, measure voltage between ground and MAF sensor terminal "A" (Yellow wire). If voltage is about zero volts, go to step  12. If voltage is not about zero volts, go to step  15.
  10. Turn ignition off. Disconnect PCM connectors. Using DVOM, check for open, high resistance, short to ground or short to voltage in MAF sensor signal circuit between MAF sensor and PCM. Repair as necessary. After repairs, go to step  22. If circuit is okay, go to step  12.
  11. Connect test light between ground and MAF sensor terminal "C" (Pink wire). If test light illuminates, go to step  13. If test light does not illuminate, go to step  14.
  12. With DVOM lead connected to PCM connector C1, terminal No. 69 (Yellow wire), check for continuity at all other circuits in both PCM connectors. If continuity exists between any circuit(s), go to step  17. If continuity does not exist between any circuit(s), go to step  19.
  13. Repair open or high resistance in MAF sensor ground circuit (Black/White wire). After repairs, go to step  22.
  14. Repair open or short to ground in MAF sensor ignition 1 voltage circuit (Pink wire). See WIRING DIAGRAMS article. Replace fuse if necessary. After repairs, go to step  22. If circuit is okay, go to step  20.
  15. Repair short to voltage in signal circuit (Yellow wire) between MAF sensor and PCM. After repairs, go to step  22.
  16. Repair short between MAF sensor connector terminal "A" (Yellow wire) and circuit that set DTC. After repairs, go to step  22.
  17. Repair circuits that are shorted together. After repairs, go to step  22.
  18. Check for poor connections at MAF sensor connector. Repair as necessary. After repairs, go to step  22. If connections are okay, go to step  20.
  19. Check for poor connections at PCM connectors. Repair as necessary. After repairs, go to step  22. If connections are okay, go to step  21.
  20. Replace MAF sensor. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. After replacing sensor, go to step  22.
  21. Replace PCM. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. Program replacement PCM. See PROGRAMMING . After replacing PCM, go to next step.
  22. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine and allow it to reach normal operating temperature. Operate vehicle within 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, go to step  2.
  23. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no undiagnosed DTCs are displayed, system is okay.
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