Cylinder 9 Ion Current Sense Circuit High

Check these first

• A short to voltage on the cylinder 9 ion current sense circuit
• An open ground on the cylinder 9 ion sense return
• A faulty cylinder 9 ignition coil driving the signal high
• Corrosion in the cylinder 9 coil connector
• An ion sense module fault on the cylinder 9 input

What to do next

1. Read cylinder 9 ion current data on a scan tool
2. Swap the cylinder 9 ignition coil to a known good cylinder
3. Test the cylinder 9 ion sense wiring for a short to voltage
4. Check the cylinder 9 coil connector and ground
5. Replace the cylinder 9 coil or ion sense module if the circuit tests good
6. Clear the code and retest

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