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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: |
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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