Error Code P06A4 is defined as Sensor Reference Voltage D Circuit Low. This is a generic trouble code, meaning it applies to all cars equipped with the OBD-II system, especially those made since 1996 up to present. It is related to the computer output circuit problems, including internal computer failure. In which case, the PCM (powertrain control module, also known as ECM or engine control module in other 2019 Mazda MX-5 rf makes) and other supporting control modules, has detected a fault within the sensor reference voltage “D” circuit. Specifications on the definition, troubleshooting, and repairs may vary from one make and model to another.
Error Code P06A4 means the PCM has detected a problem with the “D” circuit sensor reference voltage system, indicating a low reference voltage signal for the specific sensor.
The sensor in question is usually associated with the automatic transmission, transfer case, or one of the differentials. This code almost always comes with a more specific code. Thus, when diagnosing this code, it’s important to consult with a dependable 2019 Mazda MX-5 rf information source (All Data DIY is a great choice) to determine sensor location (and function) as it relates to your 2019 Mazda MX-5 rf in question.
If this code is stored and doesn’t come with other error codes, then you can suspect a programming error in the PCM. Other sensors must be diagnosed and repaired when dealing with this code, but the “D” circuit open issue must be kept in mind.
The reference voltage (usually 5V) is applied to the sensor in question through a switched (energized with the key on) circuit. There should also be a ground signal. And the sensor must be of either the variable resistance, or electromagnetic variety, and completes a specific circuit. As the pressure, temperature, and speed increases, the sensor resistance also decreases, and vice versa. As the resistance in the sensor changes with the conditions, it provide with the PCM and input voltage signal.
If the PCM receives an input voltage signal that is lower than expected, then Error Code P06A4 will be stored.
In some cases, it may require multiple drive cycles before the Check Engine light lights up. With this, allow the PCM to enter readiness mode before considering any repairs as successful. Clear the codes after doing any repairs, and then take your 2019 Mazda MX-5 rf for a test drive. If the PCM enters readiness mode, then the repair was successful. If the code comes back (resets), the PCM will not enter readiness mode, and the problem persists.
The severity of symptoms for this code depends mostly with the sensor circuit experiencing the open condition. And as said earlier, this code almost always comes with other codes. Thus, it’s important to take note of those codes as well. Common symptoms for this code include:
Several problems could lead to this code. Some of the most common causes are:
To diagnose this code, you will need a diagnostic scanner, DVOM (digital volt/ohmmeter), and a dependable 2019 Mazda MX-5 rf information source. A portable oscilloscope can also help.
Determine the location and function of the sensors by consulting with your 2019 Mazda MX-5 rf information source for the specific 2019 Mazda MX-5 rf. Then, conduct a visual inspection of the sensor system, including all the connectors and harnesses. Repair or replace anything with signs of damage, such as burned wires, connectors, or various components.
Next, connect the scanner to the diagnostic connector of your 2019 Mazda MX-5 rf and retrieve all stored codes. Write them down, along with their freeze frame data. Then, clear the code and test drive your 2019 Mazda MX-5 rf to see if they set immediately.
If all system fuses are intact, and the code still resets immediately, then use the DVOM for test reference of the voltage and ground signal of the sensor in question. Typically, you can expect 5V and a common ground at the sensor connector.
If the voltage and ground single are present on the sensor connector, then continue testing the sensor resistance and continuity levels. Use your 2019 Mazda MX-5 rf information source to get the right testing specs. Then, compare your findings. Sensors that are unable to comply with the specifications set by the manufacturer must be replaced.
Then, disconnect all related controllers from the system circuits before testing the resistance with the DVOM. If there are no reference voltage signals at the sensor, then disconnect all related controllers, and use the DVOM to check the circuit resistance and continuity between the sensor and the PCM. Open or shorted circuits must be replaced.
If the electromagnetic sensor is used, with a reciprocating signal, then use the oscilloscope to monitor live data. Pay attention to the glitches and completely open circuits.
Common repairs for this code include:
Since this code doesn’t specifically indicate how bad the voltage deficiency is, the seriousness of the problem varies from one case to another. However, since the sensor reference voltage “D” circuit is important for the operation of the engine, Error Code P06A4 is an urgent concern. Thorough diagnosis and repairs must be conducted as soon as it appears.