P254D

DTC P254D Power Take Off (PTO) Engine Speed Selector Sensor Circuit High Voltage

Circuit Description

The power take off (PTO) throttle sensor (upfilter installed) detects the PTO control throttle angle. The ECM receives the PTO control throttle angle from the throttle sensor and controls the fuel injection quantity (engine speed) during PTO. The PTO throttle sensor has the following circuits.

^ 5 volts reference circuit
^ Low reference circuit
^ PTO throttle sensor signal circuit

The PTO throttle sensor provides a signal to the ECM on the signal circuit which is relative to the position changes of the PTO throttle angle. If the ECM detects an excessively high signal voltage this DTC will set.

Condition for Running the DTC

^ DTCs P0642 and P0643 are not set.
^ The battery voltage is between 10 to 16 volts.
^ The ignition switch is ON.

Condition for Setting the DTC

^ The ECM detects that the PTO throttle sensor signal voltage is more than 4.9 volts for 1 second.

Action Taken When the DTC Sets

^ The ECM illuminates the SVS lamp when the diagnostic runs and fails. Refer to DTC Type Definitions for Action Taken When the DTC Sets - Type C.
^ The ECM inhibits PTO control.

Condition for Clearing the DTC

^ Refer to DTC Type Definitions for Condition for Clearing the SVS Lamp DTC - Type C.

Diagnostic Aids

^ If an intermittent condition is suspected refer to Intermittent Conditions in this section.
^ PTO throttle sensor may have an intermittent open somewhere in the operating range.

Notice: If this DTC is present, PTO Remote Throttle Sensor parameter will indicate 0.00 volts

Circuit/System Testing DTC P2540