Technical Description of OBD-II Trouble Code
High Circuit for Intake Manifold Runner Control in Bank 2
What does that signify?
This diagnostic trouble code (DTC) is a generic powertrain code that is applicable to all vehicles manufactured from 1996 onwards (Nissan, Honda, Infiniti, Ford, Dodge, Acura, Toyota, etc.). Although 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 P2013, 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 2. Bank 2 indicates that the malfunction is associated with the bank of the engine that does not contain the #1 cylinder.
The PCM controls the IMRC system electronically. The IMRC system is used to manage and fine-tune the flow of air into the lower intake manifold, cylinder heads, and combustion chambers. The intake manifold ports of each cylinder have individually shaped metal flaps that fit tightly and 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 with one motion, which also renders all the flaps 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 a swirling effect of air flow helps in atomizing the air/fuel mixture more completely. 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, although different manufacturers employ different methods. To obtain specifications for the IMRC system installed in the specific vehicle in question, refer to a reliable vehicle information source (All Data DIY is an excellent resource). In theory, the IMRC runners should be nearly closed during starting/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 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 fails to detect the expected change in MAP or manifold air temperature when the bank 2 IMRC flaps are moved, a malfunction indicator lamp may illuminate and a code P2013 will be stored. In some vehicles, multiple failure cycles may be required for the MIL (malfunction indicator lamp) to illuminate.
Symptoms
The symptoms of a P2013 code may include:
Causes
The possible causes for this engine code are:
Diagnostic and Repair Procedures
To diagnose a code P2013, 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 code/s, and vehicle make and model. If there is a TSB linked to the code/symptoms in question, the information contained in it will likely assist in diagnosing the code, as TSBs are created based on numerous repairs.
A visual inspection of the system wiring and connector faces is a practical starting point for any diagnosis. Since IMRC actuator connectors are prone to corrosion, which can cause an open circuit, it is advisable to focus on inspecting these areas.
Start by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. Write down this information in case the code is intermittent. Next, 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. Consult a reliable vehicle information source for specifications and use the DVOM to perform resistance tests on both the solenoid and the sensor. If either of these components fails to comply with the specifications, replace it and retest the system.
To prevent damage to the PCM, disconnect all related controllers before testing circuit resistance with the DVOM. If the resistance levels of the actuator and sensor are within compliance with the manufacturer’s specifications, use the DVOM to test the resistance and continuity of all system circuits.
Additional diagnostic notes:
