Cummins engine fault code 123


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FAULT CODE 123

Intake Manifold 1 Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source

Overview

CODE

REASON

EFFECT

Fault Code: 123

Intake Manifold 1 Pressure Sensor Circuit – Voltage Below Normal

Engine power derate to no air setting for industrial

PID:

or Shorted to Low Source. Low signal voltage detected at the intake

applications. None on performance for power

SPN: 102

manifold pressure circuit.

generation applications.

FMI: 4

LAMP: Amber

SRT:

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Intake Manifold 1 Pressure Sensor Circuit

Circuit Description

The intake manifold 1 pressure sensor monitors intake manifold pressure and passes information to the ECM through the engine harness. If the intake manifold 1 pressure sensor circuit voltage becomes too low, it will cause a derate condition.

Component Location

The intake manifold 1 pressure sensor is located in the air intake. Use the following procedure for a detailed component location view. Refer to Procedure 100-002 in Section E.

Shop Talk

The intake manifold 1 pressure sensor shares supply and return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active. Before troubleshooting Fault Code 123, check for multiple faults.

Possible causes of this fault code include:

  • Signal circuit open or shorted to ground in the engine harness or sensor

  • Supply wire open or shorted to ground.

Refer to Troubleshooting Fault Code t05-123.

Last Modified: 26-Nov-2012

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