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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: |
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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