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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 83 (Engine Controls Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0169: Fuel Composition Sensor >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 GMC Sonoma and 2002 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check, go to next step.
  2. Was DTC P0179 also set? If yes, go to DTC P0179: FUEL COMPOSITION SENSOR CIRCUIT - HIGH VOLTAGE . If no, go to next step.
  3. Read fuel composition frequency on scan tool. If frequency is greater than 139 Hz? If yes, go to next step. If no, go to step  5.
  4. Replace fuel tank. Refill with unleaded gasoline or an ethanol blend of 70 percent or less. Allow engine to run for 6 minutes. Is the fuel composition frequency less than 138 Hz? If yes, system is okay. If no, see DIAGNOSTIC AIDS .
  5. Fuel in tank contains an ethanol blend that is higher than recommended for the ambient temperature. Refill with unleaded gasoline to achieve an ethanol blend of 70 percent or less. Allow engine to run for 6 minutes. Is fuel composition frequency less than 138 Hz? If yes, system is okay. If no, see DIAGNOSTIC AIDS .
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