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Home >> Buick >> 1996 >> Roadmaster Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0103 - MAF Sensor Circuit High Frequency >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. Start and operate engine at idle. Using scan tool, select ENGINE 1 DATA LIST and monitor MAF sensor grams per second (gm/s) display. If MAF sensor value is greater than 300 gm/sec, go to step 4). If MAF sensor value is less than 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 the conditions required for this diagnostic to run, and as close to conditions recorded in FREEZE FRAME/FAILURE RECORDS as possible. Select DTC function then enter DTC P0103. 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 grams per second (gm/s) display again. If MAF sensor value is about 1.9 gm/s, go to next step. If MAF sensor value is not as specified, go to step 7).
  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 MAF 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 or replace 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, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0103. 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).
  11. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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