Cylinder 9 Pressure Sensor Circuit Low

Where it lives

For P234A, the circuit described runs through the sensor. The description of P234A puts it on cylinder 9.

Check these first

• A short to ground on the cylinder 9 pressure sensor signal wire
• An open in the cylinder 9 sensor ground circuit
• A failed cylinder 9 pressure sensor
• A low reference voltage at the cylinder 9 sensor

What to do next

1. Read cylinder 9 pressure sensor voltage on a scan tool
2. Test the cylinder 9 sensor signal wire for a short to ground
3. Check the cylinder 9 sensor ground and reference circuits
4. Replace the cylinder 9 pressure sensor if the circuit tests good
5. Clear the code and retest

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