EDI DIAGNOSIS SERVICE MANUAL NUMBER 22
Page 5E-36 90-860074--1 FEBRUARY 2002
Fuel Quantity Sensor (Control Sleeve Position Sensor)
Scan Code: P1225
Blink Code: 1222
Malfunction Indicator Lamp: ON
ECM
33
29
7
52
GRN
BLU/YEL
ORN
BRN/PUR
75565
a
b
c
d
e
f
1
2
3
4
7
6
5
b
a-Fuel Quantity Sensor (Control Sleeve Position Sensor)
b-Fuel Quantity Sensor Connector
c-Control Sleeve Position Sensor
d-Fuel Quantity Sensor (Measure Coil)
e-Control Sleeve Position Sensor Signal
f-Analog Ground (–)
CIRCUIT DESCRIPTION:
Inside the electronic diesel pump the Fuel Quantity Actuator (a rotary solenoid actuator for
controlling injected fuel quantity) engages with the control collar through a shaft. Similar to
the mechanically governed fuel injection pump, the cutoff ports are opened or closed
depending upon the control collar’s position. The injected fuel quantity can be infinitely
varied between zero and maximum (e.g., for cold starting). Using this Fuel Quantity Sensor
(an angle sensor or potentiometer) the fuel quantity actuator’s angle of rotation, and thus
the position of the control collar, are reported back to the ECU. This information is used by
the ECM to determine the injected fuel quantity as a function of engine speed.
A failure of the Fuel Quantity Sensor circuit should set a Scan Code P1225.
CKT PIN
NAME
7 Control Sleeve Position Sensor (Middle Tap)
33 Analog Ground (–)
29 Control Sleeve Position Sensor
52 Fuel Quantity Sensor Input to ECM (Measure Coil)
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