P061D Internal control module for engine air mass performance

P061D Internal control module for engine air mass performance

OBD-II DTC Datasheet

Internal control module Engine air mass characteristics

What does this mean?

This Generic Powertrain Diagnostic Trouble Code (DTC) is commonly applied to many OBD-II vehicles. This may include, but is not limited to, Ford, Mazda, Chevrolet, Lincoln, etc.

When code P061D is stored, it means that the powertrain control module (PCM) has detected an internal performance error in the engine air mass control (mass air flow - MAF) system. Other controllers may also detect an internal PCM performance error (with engine speed monitoring system) and contribute to the storage of P061D.

The internal control module monitoring processors are responsible for the various controller self-testing functions and the overall accountability of the internal control module. The input and output signals of the engine air mass calculation system are self-tested and continuously monitored by the PCM and other relevant controllers. The transmission control module (TCM), traction control module (TCSM), and other controllers can communicate with the engine air mass control system.

Engine air mass is monitored (by the PCM and other controllers) using inputs from the mass air flow (MAF) sensors. The required engine mass air flow is programmed in the PCM and other controllers. Actual engine air mass is calculated using input from the MAF sensor as well as the Throttle Position (TPS) sensor and other engine and transmission sensors. The desired engine air mass is then compared to the actual engine air mass. After comparing the desired and actual engine air mass, the PCM makes the necessary adjustments to fuel delivery and ignition timing.

Whenever the ignition is turned on and power is applied to the PCM, the internal RPM self-tests are initiated. In addition to performing a self test on the internal controller, the Controller Area Network (CAN) also compares the signals from each individual module to ensure that all controllers are working as expected. These tests are performed at the same time.

If the PCM detects an internal error in the desired engine air mass and the actual engine air mass (which exceeds the maximum allowable threshold), a code P061D will be stored and a malfunction indicator lamp (MIL) may illuminate. MIL may require multiple ignition cycles (with failure) to illuminate.

Photo of the PKM with the cover removed:

What is the severity of this DTC?

Internal control module processor codes are to be classified as Severe. A stored P061D code can suddenly and without warning lead to severe handling and fuel efficiency problems.

What are some of the symptoms of the code?

Symptoms of a P061D trouble code may include:

• Insecurity or stumble upon acceleration
• Engine misfire
• Reduced fuel efficiency
• Engine misfire codes may also be present

What are some of the common causes for the code?

Reasons for this code may include:

• Faulty MAF sensor
• Corroded MAF sensor connector
• Faulty PCM or PCM programming error
• Open or short circuit in the circuit or connectors in the CAN harness
• Insufficient grounding of the control module
• Open or short in the circuit between the MAF sensor and the PCM

What are some steps to troubleshoot the P061D?

Even for the most experienced and well-equipped professional technician, diagnosing the P061D code can be challenging. There is also the problem of reprogramming. Without the necessary reprogramming equipment, it will be impossible to replace the faulty controller and carry out a successful repair.

If there are ECM / PCM power supply codes, they obviously need to be corrected before attempting to diagnose the P061D. In addition, if MAF or Throttle Position (TPS) sensor codes are present, they must first be diagnosed and repaired.

Follow the manufacturer's recommendations for testing MAF and room temperature sensors. Replace defective components if necessary.

There are some preliminary tests that can be performed before an individual controller is declared faulty. You will need a diagnostic scanner, a digital volt-ohmmeter (DVOM) and a source of reliable information about the vehicle. An oscilloscope can also be helpful.

Connect the scanner to the vehicle diagnostic port and get all stored codes and freeze frame data. You will want to write this information down just in case the code turns out to be intermittent. After recording all relevant information, clear the codes and test drive the vehicle until the code is cleared or the PCM enters standby mode. If the PCM enters ready mode, the code is intermittent and harder to diagnose. The condition that caused the P061D to be stored may even get worse before a diagnosis can be made. If the code is reset, continue with this short list of pre-tests.

When trying to diagnose a P061D, information can be your best tool. Search your vehicle information source for technical service bulletins (TSBs) that match the stored code, vehicle (year, make, model, and engine) and symptoms displayed. If you find the right TSB, it can provide diagnostic information that will help you to a great extent.

Use your vehicle information source to obtain connector views, connector pinouts, component locators, wiring diagrams, and diagnostic block diagrams relevant to the code and vehicle in question.

Use the DVOM to test the fuses and relays of the controller power supply. Check and replace blown fuses if necessary. Fuses should be checked with a loaded circuit.

If all fuses and relays are working properly, a visual inspection of the wiring and harnesses associated with the controller should be performed. You will also want to check the chassis and motor ground connections. Use your vehicle information source to obtain grounding locations for associated circuits. Use DVOM to check ground integrity.

Visually inspect the system controllers for damage caused by water, heat, or collision. Any controller damaged, especially by water, is considered defective.

If the power and ground circuits of the controller are intact, suspect a faulty controller or a controller programming error. Replacing the controller will require reprogramming. In some cases, you can purchase reprogrammed controllers from the aftermarket. Other vehicles / controllers will require onboard reprogramming, which can only be done through a dealership or other qualified source.

• Unlike most other codes, P061D is likely caused by a faulty controller or a controller programming error.
• Check the system ground for continuity by connecting the negative test lead of the DVOM to ground and the positive test lead to the battery voltage.

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