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Intake Manifold Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 122 PID: P102 SPN: 102 FMI: 3/3 LAMP: Amber SRT: |
Intake Manifold Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the intake manifold pressure circuit. |
Automotive: Derate in power output of the engine. Marine: No engine protection for circuit or sensor failure. |
 Intake Manifold Pressure Sensor Circuit
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Circuit Description
The intake manifold pressure sensor monitors intake manifold pressure and passes information to the electronic control module (ECM) through the engine harness. If the intake manifold pressure 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 sensor failure.
Component Location
The intake manifold pressure sensor is located in the air intake horn. Refer to Procedure 100-002 for a detailed component location view.
Shop Talk
The intake manifold 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
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