Cummins engine fault code 122


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FAULT CODE 122

Intake Manifold 1 Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source

Overview

CODE

REASON

EFFECT

Fault Code: 122

Intake Manifold 1 Pressure Sensor Circuit – Voltage Above Normal

Engine power derate to no air setting for industrial

PID:

or Shorted to High Source. High signal voltage detected at the

applications. None on performance for power

SPN: 102

intake manifold pressure circuit.

generation applications.

FMI: 3

LAMP: Amber

SRT:

JZBagAAAABJRU5ErkJgggAA

Intake Manifold 1 Pressure Sensor Circuit

Circuit Description

The intake manifold 1 pressure sensor monitors intake manifold pressure and passes information to the engine control module (ECM) through the engine harness. If the intake manifold 1 pressure sensor circuit voltage becomes too high, it will cause a derate condition on automotive applications. For marine applications, no derate condition occurs. There is no engine protection for a circuit or a defective sensor.

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 122, check for multiple faults.

Possible causes of this fault code include:

  • Open return circuit in the engine harness, connectors, or sensor

  • Signal wire shorted to sensor supply or battery voltage.

Refer to Troubleshooting Fault Code t05-122.

Last Modified: 26-Nov-2012

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