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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1539 (Engine Cooling System - Non-Hybrid) >> Diagnostic Information and Procedures >> DTC P0480 or P0481 (without HP2) >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the KR20 cooling fan relay.
  2. Test for 70-110 Ω between terminals 85 and 86.
    • If not within the specified range, replace the KR20 cooling fan relay.
  3. Measure the resistance between the terminals listed below:
    • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87

      The DMM should display OL.

    • If less than the specified range, replace the KR20 cooling fan relay.
  4. Test the KR20 Fan Control Relay for less than 2 Ω between terminals 30 and 87A.
    • If greater than the specified range, replace the fan control relay.
  5. Connect a 20 A fused jumper wire between relay terminal 85 and B+. Connect a jumper wire between relay terminal 86 and ground. Test for less than 2 Ω between terminals 30 and 87.
    • If greater than the specified range, replace the KR20 cooling fan relay.
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