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144
TM 9-2320-312-24-2
Troubleshooting Section
91-13 Throttle Sensor Calibration (28)
The ECM is in PTO mode if the "PTO On/Off Switch"
is on. This can be checked with the Caterpillar
41-03 8 Volt Supply Above Normal (21)
Electronic Technician (ET). Refer to Troubleshooting,
"PTO Switch Circuit - Test" for testing if the PTO
41-04 8 Volt Supply Below Normal (21)
is being used.
Also, use this procedure if the accelerator pedal
position sensor is suspected of improper operation.
Accelerator Pedal Position Sensor
The accelerator pedal position sensor is used to
provide a throttle position signal to the ECM. Sensor
output is a constant frequency signal with a pulse
width that varies with the pedal position. This output
signal is referred to as either a duty cycle or a pulse
width modulated signal (PWM) and this output
signal is expressed as a percentage between 3 and
100 percent.
The pedal mounted accelerator pedal position
sensor is attached directly to the accelerator pedal
assembly and the pedal mounted accelerator pedal
position sensor requires no adjustment.
The accelerator pedal position sensor will produce
a duty cycle of 10 to 22 percent at low idle and 75
to 90 percent when the accelerator pedal is fully
depressed. The percent of duty cycle is translated
in the ECM into an accelerator pedal position of 3
to 100 percent.
The accelerator pedal position sensor is powered by
the ECM supply voltage (+8 VDC) from connector
P1:4 to terminal "A" of the accelerator pedal position
sensor connector. The accelerator pedal position
sensor can be replaced separately from the pedal
assembly. An incorrectly calibrated pedal assembly
can not be adjusted. The entire pedal assembly
must be replaced.
If the vehicle is using the ECM dedicated PTO
functions, the accelerator pedal position sensor will
be ignored while the engine is in PTO mode and
the "PTO Configuration" is programmed to one of
the following parameters:
Remote Switches
Remote Throttle
Note: In the cab switches configuration, the cab
accelerator pedal can be used in order to control
the engine rpm for the PTO operation. The cab
accelerator pedal can also be ignored in the "Cab
Switches" PTO configuration. Programming of
customer parameters is required in order to ignore
the cab accelerator pedal in the "Cab switches"
configuration.

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