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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 P0102 - MAF Sensor Circuit Low Frequency >> Diagnostic Procedures

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 less than 3.9 gm/s, go to step 4). If MAF sensor value is greater than 3.9 gm/s, 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 which was set. 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. Turn ignition on, with engine off. Using DVOM, check voltage between MAF signal circuit (Yellow wire) and battery ground. If voltage is about 5 volts, go to next step. If voltage reading is not as specified, go to step 8).
  5. Connect test light between MAF sensor ignition feed circuit (Pink wire) and ground circuit (Black wire) at harness connector. If test light illuminates, go to step 7). If test light does not illuminate, go to next step.
  6. Connect test light between MAF sensor ignition feed circuit and ground. If test light illuminates, go to step 9). If test light does not illuminate, go to step 10).
  7. Check for poor connection at MAF sensor harness terminals. Repair or replace terminal(s). After repairs, go to step 13). If terminals are okay, go to step 11).
  8. Check MAF signal circuit between PCM and MAF sensor for open, short to ground, or short to MAF ground. Repair as necessary. After repairs, go to step 13). If circuits are okay, go to step 12).
  9. Locate and repair open in ground circuit to MAF sensor. After repairs, go to step 13).
  10. Locate and repair open in ignition feed circuit to MAF sensor. After repairs, go to step 13).
  11. Replace MAF sensor. After replacing MAF sensor, go to step 13).
  12. Replace and program replacement PCM using required equipment. After replacing PCM, go to next step.
  13. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0102. Operate vehicle in 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).
  14. 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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