Technical Description of OBD-II Trouble Code
The intake manifold runner control for Bank 2 is stuck closed.
What does that mean?
This diagnostic trouble code (DTC) is a generic powertrain code that applies to all vehicles manufactured from 1996 onwards (Nissan, Honda, Infiniti, Ford, Dodge, Acura, Toyota, etc.). While it is a generic code, the specific repair steps may vary depending on the make and model of the vehicle.
If your vehicle equipped with OBD II has stored a code P2007, it indicates that the powertrain control module (PCM) has detected that the intake manifold air control (IMRC) actuator for engine bank two is stuck in the closed position. Bank 2 refers to the engine bank that does not contain cylinder #1.
The PCM controls the IMRC system, which is responsible for managing and fine-tuning the airflow as it enters the lower intake manifold, cylinder heads, and combustion chambers. The IMRC system consists of carefully shaped metal flaps that fit into the intake port of each cylinder. These flaps are electronically opened and closed by a runner control solenoid. If one of the flaps is stuck or binding, all of the flaps become inoperative. The IMRC actuator is typically attached to a rod using a mechanical arm or gear. Some models use a vacuum diaphragm to operate the actuator, with the PCM controlling an electronic solenoid that regulates intake vacuum to the IMRC actuator.
By channeling and restricting the airflow into the engine, a swirling effect is created. Research has shown that this swirling effect helps to atomize the air/fuel mixture more thoroughly, resulting in reduced exhaust emissions, improved fuel efficiency, and optimized engine performance.
Various manufacturers employ different IMRC methods. It is recommended to consult the vehicle information source (such as All Data DIY) to obtain details about the specific IMRC system in the vehicle being diagnosed. Typically, the IMRC runners are partially closed during starting and idling situations, and fully opened when the throttle plate is opened.
To ensure proper functioning of the IMRC system, the PCM monitors input signals from various sensors, including the IMRC runner position sensor, manifold absolute pressure (MAP) sensor, manifold air temperature sensor, intake air temperature sensor, throttle position sensor, oxygen sensors, and mass airflow (MAF) sensor, among others.
The PCM monitors the actual position of the runner flaps and adjusts them based on engine drivability data. If the PCM does not detect a sufficient change in MAP or manifold air temperature as expected when repositioning the flaps (by the IMRC actuator), it will store a code P2007. In some models, multiple ignition cycles with an IMRC actuator failure are required for the malfunction indicator lamp (MIL) to illuminate.
Symptoms
Symptoms of a P2007 code may include:
Causes
Possible causes for this engine code include:
Diagnostic and Repair Procedures
When attempting to diagnose a code P2007, it is necessary to have a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable vehicle information source. It is recommended to check for any relevant technical service bulletins (TSB) that may provide information about the symptoms, stored codes, and specific make and model of the vehicle before starting the diagnosis. If a related TSB is found, it can often assist in diagnosing the code.
A visual inspection of the system wiring and connector faces is typically the starting point for any diagnosis. In this case, it is known that IMRC actuator connectors are prone to corrosion, which can cause an open circuit. Therefore, attention should be focused on this area.
Next, the scanner should be connected to the vehicle diagnostic connector to retrieve all stored codes and freeze frame data. It is advisable to write down this information in case the code is intermittent. After clearing the codes, the vehicle should be test-driven to see if the code is reset.
If the code is reset, access to the IMRC actuator solenoid and IMRC runner position sensor should be gained. The vehicle information source should be consulted for testing specifications for these components. The DVOM can be used to perform a resistance test on the solenoid and sensor. If either of these parts does not comply with the specifications, it should be replaced, and the system should be retested.
It is important to disconnect all related controllers before testing circuit resistance with the DVOM to prevent damage to the PCM. If the actuator and sensor resistance are within compliance with the manufacturer’s specifications, the DVOM should be used to test resistance and continuity on all system circuits. Any shorted or open circuits should be repaired or replaced as necessary.
Additional diagnostic notes:
