P0660
UniversalIntake Manifold Tuning Valve Control Circuit (Bank 1)
Medium SeverityThe P0660 code indicates an issue with the control circuit for the Intake Manifold Tuning Valve (IMTV) on Bank 1 of the engine. This valve is responsible for optimizing airflow into the engine for better performance and fuel efficiency, so a problem here can lead to noticeable engine performance issues.
⚠️ Before You Begin (Safety First)
Always ensure the engine is off and cool before working on any engine components. Disconnect the negative battery terminal before inspecting or working on electrical systems to prevent accidental shorts or shocks. Wear appropriate personal protective equipment, such as safety glasses and gloves.
Common Symptoms
- Check Engine Light illuminated
- Reduced engine power or sluggish acceleration
- Poor fuel economy
- Rough idle
- Engine hesitation or stumble
- Engine noise related to intake manifold (less common)
Common Causes
- Faulty Intake Manifold Tuning Valve (IMTV) or actuator (solenoid)
- Open or short circuit in the IMTV control circuit wiring
- Corroded or loose electrical connections at the IMTV or PCM
- Faulty Engine Control Module (ECM) or Powertrain Control Module (PCM)
- Vacuum leaks affecting IMTV operation (if vacuum-actuated)
Frequently reported on: Ford Escape (2005-2007), Mazda Tribute (2005-2007), Honda Accord (2003-2007 V6), Acura TL (2004-2008)
Diagnostic Steps
- Inspect the wiring harness and connectors leading to the Intake Manifold Tuning Valve for any visible damage, corrosion, or loose connections. Repair as needed.
- Using a multimeter, test the continuity and resistance of the IMTV control circuit wiring from the PCM connector to the IMTV connector. Look for opens or shorts.
- Test the IMTV actuator for proper operation. This may involve applying power and ground directly to the solenoid (if applicable) or checking for voltage/ground signals from the PCM.
- If the IMTV actuator is suspected faulty and wiring is confirmed good, replace the Intake Manifold Tuning Valve. Ensure the replacement part is correct for your vehicle.
- Clear the DTCs and perform a test drive to confirm the repair. Monitor for the code to return.
👨🔧 When to Call a Professional
If after checking basic wiring and connectors, the issue persists or is intermittent, it's wise to consult a professional diagnostic technician. Complex electrical diagnostics or internal engine issues related to intake runner operation may require specialized tools and expertise to properly diagnose and repair.
Commonly Asked Questions
What does 'Bank 1' mean in P0660?
'Bank 1' refers to the side of the engine that contains cylinder number 1. In inline engines, there's typically only one bank. In V-type engines, Bank 1 is usually the side with cylinder 1.
Can I drive with a P0660 code?
While you may be able to drive, it's not recommended for extended periods. The engine's performance and fuel economy will be negatively affected, and ignoring the issue could potentially lead to further engine problems over time.
Is the Intake Manifold Tuning Valve the same as an IMRC valve?
Yes, 'Intake Manifold Tuning Valve' (IMTV) and 'Intake Manifold Runner Control' (IMRC) valve often refer to the same or very similar components that adjust the length or path of the intake runners to optimize airflow for different engine speeds.
How can I test the Intake Manifold Tuning Valve itself?
You can often test the valve's electrical resistance with a multimeter. For solenoid-type valves, you might apply 12V and ground to see if it actuates. Consult your vehicle's service manual for specific testing procedures and expected values.
Could a P0660 code be caused by a bad PCM?
Yes, in rare cases, a faulty Powertrain Control Module (PCM) could be the cause if it's not correctly sending signals to the IMTV. However, always rule out the valve itself and all wiring first, as PCM failures are less common.