DESCRIPTION
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002 Page 5A-19
INSTRUMENTED INJECTOR [NEEDLE MOVEMENT SENSOR (NBF)]
The injector timing reference is supplied to the ECM by way of the Instrumented Injector
(Needle Movement Sensor) in the cylinder number 1 injector. This position variable type
input creates the timing signal for the ECM. This signal is used for a number of control and
testing functions within the ECM.
75339
a
b
c
Instrumented Injector
a-Instrumented Injector
b-Electrical Harness Connector
c-Locking Tab
A failure in the Instrumented Injector circuit should set Code P1201 or P1725. Display of
these codes indicates a failure in the sensor circuit, so proper diagnosis will lead to either
repairing a wiring problem or replacing the sensor.
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