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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1062 (POWER TAKE-OFF)DIAGNOSTIC INFORMATION AND PROCEDURESPOWER TAKE-OFF (PTO) DOES NOT ENGAGECIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Circuit/System Testing

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

PTO In Cab Switch

  1. Ignition OFF, disconnect the harness connector at the PTO module.
  2. Ignition ON, test for 11 volts or greater between the B+ circuit terminal 32 and ground.
    • If less than the specified voltage, test the B+ circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, connect the harness connector at the PTO module.
  4. Ignition OFF, disconnect the harness connector at the PTO switch.
  5. Ignition ON, test for 4.8-5.2 volts between the 5V reference circuit terminal 1 and ground.
    • If less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the PTO module.
    • If greater than the specified range, test the 5V reference circuit for a short to voltage. If a short to voltage is found and repaired, replace the PTO switch. If the circuit tests normal, replace the PTO module and the PTO switch.
  6. Connect the harness connector at the PTO switch.
  7. Engine ON, observe the PTO In Cab Switch parameter with a scan tool. Verify that the PTO In Cab Switch parameter matches each depressed switch: 1, 0, RES +, SET -.
    • If any one of the switches do not match accordingly with the scan too parameter, replace the PTO switch.
  8. If all circuits test normal, replace the PTO module.

Upfitted Remote Switch Assembly

  1. Ignition OFF, disconnect the harness connector at the PTO module.
  2. Ignition ON, test for 11 volts or greater between the B+ circuit terminal 32 and ground.
    • If less than the specified voltage, test the B+ circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, connect the harness connector at the PTO module.
  4. Ignition OFF, disconnect the harness connector X124.
  5. Ignition ON, test for 4.8-5.2 volts between the 5V reference circuit terminal E and ground.
    • If less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the PTO module.
    • If greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the PTO module.
  6. Connect the harness connector X124.
  7. Engage PTO using the upfitted remote switch assembly. Observe the PTO Remote Switch Status parameter with a scan tool. Verify that the PTO Remote Switch Status parameter matches each depressed switch.
    • If any one of the switches do not match accordingly with the scan tool parameter or if PTO does not engage, replace the upfitted remote switch assembly.
  8. If all circuits test normal, replace the PTO module.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.