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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 P260A-P260C (PTO) >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the PTO relay.
  2. Igniton ON, test for 11 volts or greater between the PTO relay supply voltage circuit terminal 86 and ground.
    • If less than the specified voltage, test the PTO relay supply voltage circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, disconnect the harness connector at the PTO module.
  4. Ignition ON, test for 0 volts between the PTO relay coil control circuit terminal 28 and ground.
    • If greater than the specified value, test the PTO relay control circuit for a short to voltage.
  5. Ignition OFF, connect the PTO relay.
  6. Ignition ON, test for 11 volts or greater between the PTO relay coil control circuit terminal 28 and ground.
    • If less than the specified voltage, test the PTO relay coil control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the PTO relay.
  7. If all circuits test normal, replace the PTO module.
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