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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1976 (Engine Controls And Fuel - 2.4L - Troubleshooting & Diagnosis) >> Fuel Composition Diagnosis >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Observe the Fuel Composition Learn parameter using the scan tool. The Fuel Composition Learn parameter should display Inactive.
      IMPORTANT:
      • The key needs to be turned OFF for at least 30 seconds after the parameter displays Inactive to properly store the ethanol learned value in the ECM/PCM memory.
      • The vehicle may need to be driven more than 11 km (7 mi) with the engine at operating temperature.
    • If the Fuel Composition Learn parameter displays Active, drive the vehicle until the Fuel Composition Learn parameter displays Inactive.
  2. Record the ECM/PCM estimated value of the ethanol content using a scan tool.
  3. Record the actual measured percentage of ethanol content using the J 44175:  Tester or J 44175-A:  Tester. The ECM/PCM estimated value should be within 15 percent of the ethanol content measured with the J 44175:  Tester.
    • If the ECM/PCM estimated value is not within 15 percent of the ethanol content measured with the J44175 Tester continue with Circuit/System Testing.
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