Analog Throttle Position Sensor Circuit - Test - Perkins 1104E Series Troubleshooting Manual

104
Troubleshooting Section
Analog Throttle Position
Sensor Circuit - Test
System Operation Description:
Use this procedure if another procedure has directed
you here. Use this procedure if any of the following
diagnostic codes are active:
•
91-02 Throttle Demand Sensor erratic or
intermittent
•
91-03 Throttle Demand Sensor open circuit or
shorted high
•
91-04 Throttle Demand Sensor shorted low
•
774-02 Throttle Demand Sensor No.2 erratic or
intermittent
•
774-03 Throttle Demand Sensor No.2 open circuit
or shorted high
•
774-04 Throttle Demand Sensor No.2 shorted low
•
262-03 5V Sensor Supply Voltage more than
normal
•
262-04 5V Sensor Supply Voltage less than normal
The throttle demand sensor is an Analog sensor and
this sensor is mounted on the throttle pedal. The
throttle demand sensor provides an output voltage to
the ECM. This sensor output voltage will vary with
the position of the throttle from 0.5 volts to 4.5 volts.
The throttle demand sensor is attached directly to the
throttle assembly. Foot or hand operated versions of
the throttle assembly are also available.
The sensor receives +5 volt power from the ECM.
The sensor will produce a voltage that will alter
between low idle and high idle. The voltage is
changed into a throttle position within the range 0 to
100 percent by the ECM.
The throttle demand sensor senses the speed
requirement from the throttle position. A second
throttle demand sensor may override this speed
requirement from the first throttle demand sensor.
This override will be subject to an input from either
the SAE J1939 (CAN), or from the Set Speed Control.
The input status can be checked on the electronic
service tool Status Display Screen.
The system will check the switch position in relation
i02270219
to the throttle position signal when the idle validation
has been set for use. If the switch position and the
signal from the throttle demand sensor are valid then
the throttle will operate as normal.
RENR2696-01