Technical Description of OBD-II Trouble Code
High Bank 1 Intake Manifold Runner Control Circuit
What does that signify?
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.
When I come across a stored code P2010, I understand that it indicates that the powertrain control module (PCM) has detected a higher-than-expected voltage in the intake manifold runner control (IMRC) actuator circuit for engine bank one. The term “bank 1” indicates that the malfunction is associated with the engine bank that contains the number one cylinder.
The PCM electronically controls the IMRC system. This system is used to manage and fine-tune the flow of air into the lower intake manifold, cylinder heads, and combustion chambers. The IMRC system consists of individually shaped metal flaps that fit tightly into the intake manifold ports of each cylinder. These flaps are opened and closed by an electronic runner control actuator. In the IMRC, thin metal runner flaps are attached to a metal rod that extends the length of each cylinder head and passes through the center of each intake port. The flaps can be opened together, allowing all of them to be rendered inoperative if one of them is stuck or binding. The IMRC rod is connected to the actuator with a mechanical arm or gear. Some models use a vacuum diaphragm to maneuver the actuator. When a vacuum-operated actuator is used, the PCM controls an electronic solenoid that regulates intake vacuum to the IMRC actuator.
It has been established that creating a swirling effect in the air/fuel mixture helps in its complete atomization. This can result in reduced exhaust emissions, improved fuel efficiency, and optimized engine performance. By using the IMRC to channel and restrict air flow as it enters the engine, this swirling effect is created. However, different manufacturers employ varying methods to achieve this. To obtain specifications for the IMRC system installed in a specific vehicle, refer to a reliable vehicle information source (such as All Data DIY). In theory, the IMRC runners should be nearly closed during starting and idling conditions, and opened when the throttle plate is opened.
The PCM monitors input data 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. These signals are used to ensure that the IMRC system is functioning as expected.
The PCM monitors the position of the IMRC runner flaps and adjusts their position based on engine drivability data. If the PCM does not detect the expected change in MAP or manifold air temperature when the IMRC flaps are moved, it may illuminate a malfunction indicator lamp and store a code P2010. In some vehicles, multiple failure cycles may be required for the MIL to illuminate.
Symptoms
The symptoms of a P2010 code may include:
Causes
Possible causes for this engine code include:
Diagnostic and Repair Procedures
To diagnose a code P2010, you will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable vehicle information source. Before starting any diagnosis, it is helpful to check for any technical service bulletins (TSB) related to the specific symptoms, stored codes, and vehicle make and model. TSBs contain valuable information gathered from numerous repairs.
Begin by visually inspecting the system wiring and connector faces. Pay special attention to the IMRC actuator connectors, as they are prone to corrosion, which can cause an open circuit.
Next, connect the scanner to the vehicle diagnostic connector and retrieve all stored codes and freeze frame data. Write down this information in case the code is intermittent. Clear the codes and test-drive the vehicle to see if the code is reset.
If the code is reset, gain access to the IMRC actuator solenoid and IMRC runner position sensor. Refer to your vehicle information source for specifications and use the DVOM to perform resistance tests on both the solenoid and the sensor. If either component fails to comply with the specifications, replace it and retest the system.
Before testing circuit resistance with the DVOM, disconnect all related controllers to prevent PCM damage. If the actuator and sensor resistance levels meet the manufacturer’s specifications, use the DVOM to test resistance and continuity on all system circuits.
Additional diagnostic notes:
