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Home >> Chevrolet >> 2002 >> TrailBlazer RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel System (Bi-Fuel & CNG) >> Fuel Lock-Off Relay >> Test Description
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Test Description

The numbers below refer to step numbers in diagnostic procedures.

  1. 1

    Diagnostic System Check must be performed before proceeding with this diagnostic procedure. Failure to perform system check will result in misdiagnosis.
  2. 4

    PCM energizes Fuel Pump Relay Control circuit for about 2 seconds every time ignition is cycled from OFF to ON.