Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Scan Tool Data Definitions (Power Take-Off)
The Scan Tool Data Definitions contains a brief description of all power take-off (PTO) related parameters available on the scan tool inside the PTO module (PTOM).
- End Model Part Number
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The scan tool displays the part number of the PTOM.
- Engine Speed
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The scan tool displays 0 to 9,999 RPM. The engine control module (ECM) monitors the crankshaft position (CKP) signal circuit in order to determine the engine RPM.
- Ignition 1 Signal
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The scan tool displays Volts. This is the voltage at the B+ input of the PTOM.
- PTO Disengage Reason
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The scan tool displays the last reason why the PTO was disengaged. Refer to the Scan Tool Data Definitions (Disengage or Inhibit Reasons) for descriptions.
- PTO Indicator
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The scan tool displays On or Off. The PTOM monitors the signal circuit of the PTO switch. A closed switch is displayed as On.
- PTO Inhibit Reason
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The scan tool displays the last reason why the PTO system was inhibited. Refer to the Scan Tool Data Definitions (Disengage or Inhibit Reasons) for descriptions.
- PTO In Cab Switch
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The scan tool displays PTO Off, PTO On, Set 1, Set 2, No Action, Invalid, or Indeterminate. The PTOM monitors the signal circuit of the PTO switch.
- PTO In Cab Switch A
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The scan tool displays %. The PTOM monitors the mode select A circuit and displays the current percentage.
- PTO In Cab Switch B
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The scan tool displays %. The PTOM monitors the mode select B circuit and displays the current percentage.
- PTO In Cab Switch C
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The scan tool displays %. The PTOM monitors the mode select C circuit and displays the current percentage.
- PTO Option
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The scan tool displays Enhanced, Disable, Preset, Variable, Mobile, or Fast Idle. This is the current state of the PTO system.
- PTO Relay Indicator
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The scan tool displays On or Off. This is the current state of the PTO relay.
- PTO Remote Accelerator Sensor (If Equipped)
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The scan tool displays %. If equipped, the ECM sends a serial data message to the PTO module regarding the status of the PTO remote accelerator sensor.
- PTO Remote Switch Status
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The scan tool displays PTO Off, PTO On, Set 1, Set 2, No Action, Invalid, or Indeterminate. The PTOM monitors the signal circuit of the PTO remote switch.
- PTO Status
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The scan tool displays Disabled, Standby Disabled, Standby Pending, PTO Standby, PTO Active, Reserved, PTO Set, PTO Coast, Reserved, PTO Accelerate, Shutdown, or No Action. This is the current status of the PTO system.
- Requested Engine Speed
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The scan tool displays the requested RPM.
- Software Part Number
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The scan tool displays the software part number.
- Vehicle Speed
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The scan tool displays 0 to 150 km/h (93.2 mph). The ECM monitors the vehicle speed sensor signal circuit in order to calculate the vehicle speed for display. The ECM sends a serial data message to the PTOM regarding the current vehicle speed.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • 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.