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Home >> GMC >> 2002 >> Jimmy 2D Utility, Part Time, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 127 (Engine Controls - System & Component Testing) >> Fuel System (Bi-Fuel & CNG) >> Fuel Lock-Off Relay >> Test Description
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Test Description

WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.

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.

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