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Technical Description of OBD-II Trouble Code
The circuit for the Intake Manifold Runner Position Sensor/Switch in Bank 1
What does that signify?
This particular diagnostic trouble code is applicable to fuel injected engines from various manufacturers since 2003.
These manufacturers include Ford, Dodge, Toyota, Mercedes, Nissan, and Infiniti, among others.
This code primarily focuses on the value provided by the intake manifold flow control valve/position sensor, also known as the IMRC valve/sensor (typically located at one end of the intake manifold). This valve/sensor assists the vehicle’s PCM in regulating the amount of air entering the engine at different RPMs. The code specifically pertains to Bank 1, which consists of cylinder number 1. The issue can be either a mechanical or electrical circuit fault, depending on the vehicle manufacturer and fuel system.
The troubleshooting steps may vary depending on the manufacturer, type of fuel system, and the type of intake manifold runner control valve/position (IMRC) sensor and wire colors.
Indications
The symptoms associated with the P2014 engine code may include:
Causes
The typical causes for this code to be triggered are:
Diagnostic Steps and Repair Information
It is always advisable to begin by checking for any technical service bulletins (TSB) specific to your vehicle. Your issue may be a known problem with a known solution provided by the manufacturer, which can save you time and money during diagnosis.
First, check if there are any other diagnostic fault codes present. If there are any related to the intake/engine performance system, it is important to diagnose and address them first. Misdiagnosis can occur if this code is diagnosed before thoroughly diagnosing and dismissing any intake/engine performance related system codes. Ensure that there are no intake or exhaust leaks, as an intake or vacuum leak can cause the engine to run lean, while an exhaust leak can give the impression of a lean running engine based on the air fuel ratio/oxygen (AFR/O2) sensor.
Next, locate the IMRC valve/sensor in your specific vehicle. Once found, visually inspect the connectors and wiring for any signs of chafing, rubbing, bare wires, burn spots, or melted plastic. Separate the connectors and carefully examine the terminals inside. Check for corrosion, burns, or any abnormal green coloration. If cleaning of the terminals is necessary, use Electrical Contact cleaner, which can be obtained from any parts store. Alternatively, use 91% rubbing alcohol and a light plastic bristle brush (such as an inexpensive toothbrush) to clean the terminals. After cleaning, allow them to air dry and apply some dielectric silicone compound (the same type used for light bulb sockets and spark plug wires) where the terminals make contact.
If you have a scan tool, clear the diagnostic trouble codes from memory and observe if this code reappears. If it does not, then the issue was most likely related to the connections.
If the code does reappear, it is necessary to test the voltage signals to and from the IMRC valve/sensor and the PCM. Monitor the IMRC sensor voltage using a scan tool. If a scan tool is not available, use a digital volt ohm meter (DVOM) to test the signal coming from the IMRC sensor. With the sensor connected, attach the red voltmeter lead to the IMRC sensor signal wire and the black voltmeter lead to ground. Start the engine and monitor the IMRC sensor input. As the engine RPM increases, the IMRC sensor signal should change. Refer to the manufacturer’s specifications for a chart indicating the expected voltage at a given RPM.
If the IMRC sensor fails this test, it is necessary to verify that the IMRC valve moves freely without binding or sticking inside the intake manifold. Remove the IMRC sensor/actuator and check the pin or linkage that controls the plates/valves inside the intake manifold. Keep in mind that there may be tension on them due to the attached return spring. Rotate the plates/valves and check for any binding or looseness. If any issues are found, the plates/valves will need to be replaced, which usually requires replacing the entire intake manifold. It is recommended to seek assistance from professionals for this task.
If the IMRC plates/valves rotate without any binding or excessive looseness, it indicates the need to replace the IMRC sensor/actuator and retest.
Once again, it is crucial to diagnose all other codes before addressing this one, as problems that trigger other codes can also trigger this code. Furthermore, if the initial steps of diagnosis do not reveal an obvious problem, it is advisable to consult with an automotive professional regarding the repair of your vehicle. Most repairs beyond this point involve removing and replacing the intake manifold to properly address this code and the related engine performance issue.
Professional Service
While we always recommend resolving this issue through mechanical means, if that is not possible, we offer the option to permanently delete this specific DTC. All other codes will continue to function. If you are interested in this option, please upload your ECU file to our portal.
