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Home >> GMC >> 2002 >> Yukon Base, 5.3 Z, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Ignition System >> Ignition Relay Diagnosis (3.4L) >> Test Description
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Test Description

The numbers below refer to step numbers in diagnostic procedure.

  1. 2

    This step is testing battery positive voltage circuit of ignition relay.
  2. 3

    This step is testing Ignition 1 positive voltage circuit of ignition relay.
  3. 4

    This step is testing coil ground circuit of ignition relay.
  4. 5

    This step isolates circuits from ignition relay. All circuits at relay are good if test light illuminates.