Diagnostic Functional Tests

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.