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Home >> Chevrolet >> 1997 >> C3500 HD 7.4 J, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Controls - Tests W/Codes - 6.5L) >> Diagnostic Trouble Codes >> DTC P0103 - MAF Sensor Circuit High Frequency >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different variant/trim than selected.
  1. Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the BASIC TESTING - 6.5L DIESEL article. Then go to next step.
  2. Start engine. With engine at idle, monitor MAF display on scan tool. If MAF reading is greater than 10496 Hz, go to step 4). If MAF reading is less than 10496 Hz, go to next step.
  3. Turn engine off. Turn ignition on, with engine off. Review and record Fail Records data on scan tool. Operate vehicle within the Fail Records conditions as noted. Using scan tool, monitor SPECIFIC DTC information for DTC P0103. If scan tool indicates that DTC P0103 failed in this ignition cycle, go to next step. If DTC P0103 did not fail in this ignition cycle, see DIAGNOSTIC AIDS.
  4. Turn ignition off. Disconnect MAF sensor harness connector. Start and idle engine. Using scan tool, monitor MAF display. If MAF value is 00 Hz, go to next step. If MAF value is not 00 Hz, go to step 7).
  5. Check for poor connection at MAF harness connector terminals. Repair as necessary. After repairs, go to step 10). If terminals or connection is 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. Ensure there are no aftermarket add-ons near harness. Correct harness routing. After repairs, go to step 10). If no problems are found, go to next step.
  8. Check MAF sensor signal circuit terminal connections at PCM. Repair as necessary. After repairs, go to step 10). If no problems are found, go to next step.
  9. Replace PCM. 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 number that was set. 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. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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