Symptoms
Symptoms of a P2010 code may include:
- Hesitation during acceleration
- Reduced engine performance, especially at low RPM
- Rich or lean exhaust
- Reduced fuel efficiency
- Engine surging
Causes
Possible causes of this engine code include:
- Loose or binding intake manifold runner controls
- Faulty IMRC actuator solenoid
- Bad intake manifold runner control position sensor
- Open or shorted wiring in the IMRC actuator solenoid control circuit
- Carbon buildup on IMRC flaps or intake manifold ports
- Faulty MAP sensor
- Corroded IMRC actuator solenoid connector face
Diagnostic and Repair Procedures
A diagnostic scanner, digital volt/ohmmeter (DVOM), and reliable vehicle information source will be needed to diagnose a P2010 code. I find it helpful to check Technical Service Bulletins (TSBs) for the specific symptoms, stored codes, and make and model of the vehicle in question before starting any diagnosis. If you find a TSB related to the code/symptoms in question, the information it contains will likely help diagnose the code as TSBs are packed with thousands of repairs.
A convenient starting point for any diagnosis is a visual inspection of the system wiring and connector faces. Knowing that IMRC actuator connectors are prone to corrosion and this could cause an open circuit, one might focus attention on inspecting these areas.
Proceed by connecting the scanner to the vehicle’s diagnostic connector and retrieving all stored codes and freeze frame data. Note this information, just in case it’s an intermittent code. Then clear the codes and test drive the vehicle to see if the code resets.
Next, access the IMRC actuator solenoid and IMRC runner position sensor if the code resets. Consult your vehicle information source for specifications, then use the DVOM to perform resistance tests on the solenoid and sensor. Replace either component if it doesn’t meet specifications and retest the system.
To avoid damaging the PCM, disconnect all associated controllers before testing circuit resistance with the DVOM. If the actuator and sensor resistance levels meet manufacturer specifications, use the DVOM to test resistance and continuity on all system circuits.
Additional Diagnostic Notes:
Carbon coking inside intake manifold walls can cause IMRC flaps to bind
Be careful when handling small screws or rivets in or near intake manifold openings
Test IMRC flap binding with the actuator disconnected from the shaft
The screws (or rivets) that secure the flaps to the shaft may loosen or fall out, causing the flaps to jam