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Intake Manifold Pressure Sensor Circuit
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 122 PID: P102 SPN: 102 FMI: 3 LAMP: Yellow SRT: |
High voltage detected at the intake manifold pressure sensor signal pin. |
Engine may derate to no-boost fueling. |
 Intake Manifold Pressure Sensor Circuit
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Circuit Description
The intake manifold pressure/temperature 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.
Component Location
The intake manifold pressure/temperature sensor is located on the intake air manifold.
Shop Talk
- Determine if engine is being fueled from an alternate fuel source.
- Confirm that the correct intake manifold pressure/temperature sensor part number is being used.
- Confirm that the correct turbocharger is being used.
- If it is suspected that cold intake air is the cause of the high intake manifold pressure, test the engine with warm intake air.
- Inspect the intake manifold pressure/temperature sensor circuit for signs of tampering. Remove any extra wires from the circuit.
- If Fault Codes 122 and 386 are active, then begin troubleshooting Fault Code 386 first.
Refer to Troubleshooting Fault Code t05-122
Last Modified: 26-Oct-2010
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