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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 549 (Electric Cooling Fans) >> Diagnostic Tests >> DTC P1481 >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2)

    Tests that the PCM receives a cooling fan speed signal through the cooling fan speed signal circuit. If answer to question is Yes, see DIAGNOSTIC AIDS  .

  2. 3)

    Tests for the proper operation of the clutch hall effect sensor.

  3. 4)

    Tests for the proper operation of the 5-volt reference circuit and of the low reference circuit of the cooling fan.
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