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Home >> GMC >> 1994 >> Forward Control 7.4 N >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - 6.5L Diesel >> Fuel System >> Important Preliminary Checks >> Notes
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Important Preliminary Checks: Notes

Ensure you have performed the On-Board Diagnostic System Check and determined that:

  1. The Control Module and MIL (Malfunction Indicator Lamp) are operating correctly
  2. There are no Diagnostic Trouble Codes (DTCs) stored, or a DTC exists but without a MIL.
See BASIC TESTING - 6.5L DIESEL article.