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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 424 (Engine Controls - Basic Diagnostic Procedures - 3.8L) >> Fuel Systems >> Fuel Injector Circuit Diagnosis >> Test Description

Test Description

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Pontiac Grand Prix, 2003 Pontiac Bonneville, 2003 Chevrolet Monte Carlo, 2003 Chevrolet Impala, and 2003 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Fuel Injector Circuit Diagnosis testing for Bonneville & LeSabre is not available from manufacturer at this time. See FUEL SYSTEM DIAGNOSIS .

The numbers below refer to the step numbers in the diagnostic procedure.

Grand Prix

  1. 4  - This step tests for a short to ground on the fuel injector ignition 1 voltage supply circuit, fuse side.
  2. 5  - This step tests for a short to ground on the fuel injector ignition 1 voltage supply circuit.

Impala, Monte Carlo & Park Avenue

  1. 4  - This step tests for a short to ground on the fuel injector ignition 1 voltage supply circuit.
  2. 5  - This step tests for a short to a PCM ground on the fuel injector ignition 1 voltage supply circuit.
  3. 6  - This step tests for an open ignition 1 voltage supply circuit between the fuel injector fuse and the multi-way harness connector.
  4. 7  - This step tests for an open or high resistance between the multi-way harness connector and the fuel injectors.

Regal

  1. 4  - This step tests for a short to ground on the fuel injector ignition 1 voltage supply circuit.
  2. 5  - This step tests for an open ignition 1 voltage supply circuit between the injector fuse and a fuel injector harness connector.
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