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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P0102: MAF Sensor Circuit Low Frequency ("Y" Body) >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Check ENG-IGN1 fuse. If fuse is open, go to step  20. If fuse is not open, go to next step.
  3. Start and operate engine at idle. Using scan tool, select ENGINE 2 DATA LIST and monitor MAF sensor frequency. If MAF sensor value is less than 10 Hz, go to step  5. If MAF sensor value is not less than 10 Hz, go to next step.
  4. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME and/or FAILURE RECORDS data and note parameters. Turn ignition off for about 15 seconds. Start engine and operate vehicle within conditions required for this diagnostic to run, and 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 this test failed this ignition, go to next step. If scan tool does not indicate that this test failed this ignition, see DIAGNOSTIC AIDS .
  5. Turn ignition off. Disconnect MAF sensor harness connector. Turn ignition on, with engine off. Using DVOM, check voltage between MAF signal circuit and battery ground. If voltage is about 5 volts, go to next step. If voltage is not as specified, go to step  8.
  6. Turn ignition off. Connect a fused jumper wire between battery ground and MAF sensor signal circuit. Turn ignition on, with engine off. Check for DTCs. If additional DTCs are set, go to step  21. If no additional DTCs are set, go to next step.
  7. Attempt to start engine and operate at idle. Check for DTCs. If additional DTCs are set, go to step  21. If no additional DTCs are set, go to step  12.
  8. Turn ignition off. Disconnect PCM harness connector. Turn ignition on, with engine off. Check voltage at MAF sensor signal circuit at PCM harness connector. If voltage is present, go to step  15. If voltage is not present, go to next step.
  9. Turn ignition off. Check continuity of MAF sensor signal circuit. If continuity does not exist, go to step  16. If continuity exists, go to next step.
  10. Check for continuity of MAF sensor signal circuit to battery ground. If continuity does not exist, go to next step. If continuity exists, go to step  17.
  11. Disconnect TAC module harness connector. Check continuity between MAF sensor signal circuit and all other circuit at PCM/TAC harness connector. If continuity does not exist, go to step  24. If continuity exists, go to step  18.
  12. Connect a test light between MAF sensor ignition feed and ground circuits at MAF sensor harness connector. If test light illuminates, go to step  14. If test light does not illuminate, go to next step.
  13. Connect test light between battery ground and MAF sensor ignition feed circuit. If test light illuminates, go to step  19. If test light does not illuminate, go to step  20.
  14. Check for poor connection at MAF sensor harness connector terminals. Repair as necessary. After repairs, go to step  26. If connection is okay, go to step  23.
  15. Repair short to voltage in MAF sensor signal circuit. After repairs, go to step  26.
  16. Repair open in MAF sensor signal circuit. After repairs, go to step  26.
  17. Repair short to ground in MAF sensor signal circuit. After repairs, go to step  26.
  18. Repair circuits that are shorted together. After repairs, go to step  26.
  19. Repair for open in MAF sensor ground circuit. After repairs, go to step  26.
  20. Repair open or grounded ignition feed circuit to MAF sensor. After repairs, go to step  26.
  21. Disconnect PCM/TAC harness connectors. Check for continuity from MAF signal circuit to all other PCM/TAC module circuit at PCM/TAC module harness connectors. If continuity exists, go to next step. If continuity does not exist, go to step  25.
  22. Repair circuits that are shorted together between MAF sensor signal circuit and circuit for which continuity exists. After repairs, go to step  26.
  23. Replace MAF sensor. After replacing sensor, go to step  26.
  24. Check for poor connection at PCM. Repair as necessary. After repairs, go to step  26. If connection is okay, go to next step.
  25. Replace PCM. Reprogram replacement PCM using required equipment. After replacing PCM, go to next step.
  26. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, and then enter this DTC. Operate vehicle in 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.
  27. 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.
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