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TM 9-2320-312-24-2
Troubleshooting Section
Diagnostic Functional
Tests
i01631722
5 Volt Engine Pressure Sensor
Supply Circuit - Test
SMCS Code: 1408-081; 1901-081
System Operation Description:
Use this procedure under the following situation:
Use this procedure to troubleshoot the system when
one of the following diagnostic codes is active or
easily repeated:
232-03 5 Volt Supply Above Normal (21)
g00767035
Illustration 20
232-04 5 Volt Supply Below Normal (21)
Also, use this procedure to troubleshoot the system
when you have been directed here by another
troubleshooting procedure.
The following background information is related
to this procedure:
The Engine Control Module (ECM) supplies the
following sensors with regulated +5 V DC power
from the same supply:
J200/P200 boost pressure sensor
J203/P203 atmospheric pressure sensor (specific
ratings only)
J201/P201 engine oil pressure sensor (optional)
J204/P204 injection actuation pressure sensor
The supply for the +5 V engine pressure sensor is
routed from the ECM through ECM engine harness
connector J2/P2 terminal 2 to terminal "A" of each
pressure sensor connector. The supply voltage is
5.0 0.5 V DC.
The +5 V diagnostic code is probably caused by
a short circuit or an open circuit in the harness.
The next probable cause is a sensor and the least
probable cause is the ECM.

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