Cathode Backpressure Valve Position Sensor Circuit

Where it lives

For U3560, the sensor sits on the circuit this code reports. The description of U3560 reports a fault at the sensor.

Check these first

• A cathode backpressure valve position sensor with a drifting or dead signal
• A cathode backpressure valve that sticks and skews the sensor reading
• A loose or corroded cathode backpressure valve position sensor connector
• An open or short in the cathode backpressure valve position sensor wiring

What to do next

1. Read cathode backpressure valve position sensor voltage on a scan tool
2. Command the cathode backpressure valve through its range
3. Inspect the cathode backpressure valve position sensor connector and wiring
4. Test the cathode backpressure valve position sensor circuit for open and short faults
5. Replace the sensor or valve if the position signal stays wrong
6. Clear the code and retest

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