EDI DIAGNOSIS SERVICE MANUAL NUMBER 22
Page 5E-34 90-860074--1 FEBRUARY 2002
Fuel Quantity Actuator (Pump Actuator)
Scan Code: P1220
Blink Code: 1223
Malfunction Indicator Lamp: ON
ECM
4
45
5
68
49
23
RED
RED
RED
GRN/WHT
GRN/WHT
GRN/WHT
RED
75565
75409
a
b
c
d
e
c
d
b
c
d
1
2
3
4
7
6
5
a-Fuel Quantity Actuator (Inside Injection Pump)
b-Harness Connector
c-Battery Supply Voltage To Sensor From ECM
d-Sensor Ground (–)
e-Twisted Wire Pair
CIRCUIT DESCRIPTION:
Inside the electronic diesel pump the Fuel Quantity Actuator (a rotary solenoid actuator) for
injected fuel quantity control 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). When no voltage is applied to the actuator, its
return springs reduce the injection quantity to zero.
A failure of the Fuel Quantity Actuator circuit should set a Scan Code P1220.
CKT PIN
NAME
4 Fuel Quantity Actuator (1 of 3 total, one of a twisted pair)
5 Fuel Quantity Actuator (2 of 3 total, second of a twisted pair)
49 Fuel Quantity Actuator (3 of 3 total)
23 Battery Supply Voltage (1 of 3)
45 Battery Supply Voltage (2 of 3)
68 Battery Supply Voltage (3 of 3)
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