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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Basic Diagnostic Procedures >> No-Start Diagnosis >> No-Start - Engine Cranks Okay (4.8L, 5.3L & 6.0L) >> Test Description

Test Description

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

  1. 4

    You may need to connect a battery charger to the battery for this step. If the battery state of charge is low, the scan tool may reset during the cranking test.

  2. 5

    This step tests the ignition relay for proper operation. The ignition relay supplies voltage to the injectors and the ignition coils. When the ignition relay is not operating properly, a no start condition occurs. If the test light does not illuminate, this indicates the ignition relay is not suppling a voltage to the fuses.

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