Symptoms of P2006 Code
Common symptoms associated with P2006 code may include:
- Hesitation during acceleration
- Rich exhaust gas mixture
- Reduced fuel efficiency
- Engine over-revving
Possible Causes of P2006 Code
Potential causes of this engine code include:
- Loose or binding intake runners
- Faulty IMRC actuator solenoid
- Defective intake manifold runner control position sensor
- Open or shorted wiring in IMRC actuator solenoid control circuit
- Carbon buildup on IMRC flaps or intake manifold ports
- Faulty MAP sensor
- Corrosion on IMRC actuator solenoid connector face
Diagnostic and Repair Procedures
To diagnose a P2006 code, you will need a diagnostic scanner, digital voltmeter/ohmmeter (DVOM), and a reliable source of information for your vehicle. Before starting diagnosis, it’s recommended to check technical service bulletins (TSBs) for specific symptoms, stored codes, and vehicle make/model information.
Here are the general diagnostic steps:
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Visual Inspection: Begin with a visual inspection of the system wiring and connector faces, particularly those of the IMRC actuator solenoid, which are prone to corrosion. Corrosion can cause an open circuit, so pay close attention to this area.
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Scanner and Data Collection: Connect the diagnostic scanner to the vehicle, retrieve all stored codes and freeze frame data. Note this information, especially if the code might be intermittent. Then clear the codes and test drive the vehicle to see if the code resets.
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Component Testing: If the code resets, check the IMRC actuator solenoid and intake manifold position sensor. Consult manufacturer specifications to test these components using the DVOM. If any components don’t meet specifications, replace them and retest.
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Resistance and Continuity Tests: Before testing circuit resistance, disconnect all associated controllers to avoid damaging the PCM. Test resistance and continuity on all system circuits. If you find any shorted or open circuits, repair or replace them.
Additional Diagnostic Notes:
- Careful Handling: Be careful when handling small screws or rivets around intake manifold openings.
- IMRC Flap Testing: Disconnect the actuator from the shaft to test flap movement. The screws or rivets that secure the flaps to the shaft can loosen and fall out, which may cause the flaps to bind.
- Carbon Buildup: Carbon buildup inside intake manifold walls can cause IMRC flaps to bind, preventing proper operation.