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Home >> Pontiac >> 2000 >> Firebird Formula, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 5.7L >> Diagnostic Tests >> DTC P0103: MAF Sensor Circuit High Frequency >> Diagnostic Procedures

Diagnostic Procedures

  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. Start and operate engine at idle. Using scan tool, monitor MAF sensor frequency. If MAF sensor frequency is greater than 14,000 Hz, go to step  4. If MAF sensor value is not as specified, go to next step.
  3. 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 .
  4. Turn ignition off. Disconnect MAF sensor harness connector. Start engine. Using scan tool, monitor MAF sensor frequency. If a MAF sensor frequency is displayed, go to step  7. If a MAF sensor frequency is not displayed, go to next step.
  5. Check for poor connection at MAF sensor harness connector terminal. Repair or replace as necessary. After repairs, go to step  10. If harness connector terminals are okay, go to next step.
  6. Replace MAF sensor. After replacing sensor, go to step  10.
  7. Check MAF sensor harness for incorrect routing near secondary ignition wires or components, or solenoids, relays or motors. Correct problem as necessary. After repairs, go to step  10. If routing is okay, go to next step.
  8. Check MAF sensor signal circuit terminal connections at PCM. Repair as necessary. After repairs, go to step  10. If connections are okay, go to next step.
  9. Replace PCM. Program replacement PCM using necessary equipment. After replacing PCM, go to next step.
  10. Using scan tool, clear DTCs. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, and then enter this DTC. 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.
  11. 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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