Manifold Tune Valve Solenoid Circuit

What this code means

The PCM has detected a fault in the manifold tune valve solenoid circuit. The manifold tune valve adjusts intake manifold runner length for optimal volumetric efficiency across the RPM range.

Symptoms

• Check Engine Light
• Reduced engine performance at certain RPM ranges
• Slight loss of low-end or high-end torque
• Minor hesitation

Common causes

• Faulty manifold tune valve solenoid
• Wiring issue to solenoid
• Solenoid connector corrosion
• Manifold tune valve stuck from carbon deposits
• Vacuum supply issue

Diagnostic steps

1. Test manifold tune valve solenoid resistance
2. Actuate solenoid with scan tool and verify operation
3. Inspect wiring and connector for damage or corrosion
4. Check manifold tune valve for free movement
5. Verify vacuum supply to actuator

Repair notes

Replace the manifold tune valve solenoid or clean the tune valve if stuck due to carbon buildup.

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