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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1027 (Power Take-Off System) >> Diagnostic Information and Procedures >> DTC C0899 or C0900 (PTO) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the power take-off (PTO) module.
  2. Ignition ON, test for greater than 11.0 volts between the B+ voltage circuit terminal 32 and ground.
    • If less than the specified value, test the B+ voltage circuit for a high resistance.
  3. Ignition ON, test for greater than 11.0 volts between the B+ voltage circuit terminal 32 and the ground circuit terminal 1.
    • If less than the specified value, test the ground circuit for a high resistance.
  4. Engine ON, test for less than 16 volts between the B+ voltage circuit terminal 32 and ground.
    • If greater than the specified value, test the voltage circuit for a short to voltage. If the circuit tests normal, refer to Charging System Test .
  5. If all circuits test normal, test or replace the PTO module.
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