EDI DIAGNOSIS SERVICE MANUAL NUMBER 22
Page 5E-66 90-860074--1 FEBRUARY 2002
RPM Signal From Injector (Secondary Engine Speed Sensor)
Scan Code: P1725
Blink Code: 3332
Malfunction Indicator Lamp: ON
ECM
12
11
75339
1
2
WHT
BRN
1
2
a
b
c
d
e
a-Instrumented Injector (Needle Movement Sensor)
b-Harness Connector
c-Sensor ECM Signal
d-Sensor Ground (–)
e-Symbol for Shield Cable
CIRCUIT DESCRIPTION:
A secondary engine speed sensor signal called rpm Signal From Injector, is supplied to the
ECM by way of the Instrumented Injector in the Number 1 Cylinder.
When functioning for the ECM circuitry as the Secondary Speed Sensor, a failure in this
circuit will set a Scan Code P1725. Display of this code indicates a failure in the sensor
circuit, so proper diagnosis will lead to either repairing a wiring problem or replacing the
sensor.
CKT PIN
NAME
11 Sensor Ground (–)
12 Instrumented Injector Sensor Signal
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