Air Inlet Pressure Sensor Circuit

Where it lives

For U3559, the sensor sits on the circuit this code reports. The description of U3559 reports a fault at the sensor.

Check these first

• An air inlet pressure sensor with a drifting or dead signal
• Contamination or damage on the air inlet pressure sensor element
• A loose or corroded air inlet pressure sensor connector
• An open or short in the air inlet pressure sensor wiring

What to do next

1. Read air inlet pressure sensor voltage on a scan tool
2. Inspect the air inlet pressure sensor connector and wiring
3. Test the air inlet pressure sensor circuit for open and short faults
4. Compare the air inlet pressure sensor reading against a known value
5. Replace the air inlet pressure sensor if the circuit tests good
6. Clear the code and retest

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