Cylinder 9 Ion Current Sense Circuit Range/Performance

Check these first

• An erratic cylinder 9 ion sense signal from a failing coil
• Intermittent chafing in the cylinder 9 ion current sense wiring
• A loose cylinder 9 coil connector
• A spark plug gap or heat range wrong for cylinder 9
• A drifting ion sense module on the cylinder 9 channel

What to do next

1. Read cylinder 9 ion current data on a scan tool
2. Inspect the cylinder 9 spark plug, coil and boot
3. Wiggle test the cylinder 9 ion sense wiring for an intermittent
4. Reseat the cylinder 9 coil connector
5. Replace the cylinder 9 coil or ion sense module if the signal stays erratic
6. Clear the code and retest

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