Cylinder 10 Exhaust Valve Control Circuit Performance

Where it lives

For P3478, the part to look at first is the valve named here. The description of P3478 puts it on cylinder 10.

Check these first

• An intermittent open or short in the cylinder 10 exhaust valve control circuit
• A slow or sticking exhaust valve control solenoid on cylinder 10
• Carbon buildup limiting exhaust valve actuator travel on cylinder 10
• A control module that is losing feedback from the cylinder 10 exhaust valve circuit

What to do next

1. Read the stored code and freeze frame data on a scan tool
2. Command the cylinder 10 exhaust valve control solenoid on and off
3. Compare the commanded and actual cylinder 10 exhaust valve positions
4. Inspect the cylinder 10 exhaust valve actuator for binding or carbon
5. Replace the cylinder 10 exhaust valve control solenoid if the circuit tests good
6. Clear the code and retest

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