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What is this gibberish anyway!?

Freeze Frame OBD2 Information Explained

Unless y'all're an skillful mechanic, the OBD2 freeze frame information might look similar a meaningless set up of symbols, numbers, and acronyms. This will hold especially truthful if you know naught about cars.

But the OBD2 freeze frame data is more than than just a list. The freeze frame displays the PID or parameter ID values when the diagnostic trouble lawmaking (DTC) was triggered. Remember of it equally the criminal offense scene in those police Tv set programs. The check engine lite will illuminate due to the presence of the fault code. Consider this as the victim in the crime.

Freeze Frame data takes a snapshot of your engine data at the fourth dimension of trouble… sorta like a crime scene!

Simply the freeze frame information volition indicate what the other sensors or components are doing when the ECU recorded the error code. This is the criminal offense scene. If you know what to look for, reading or interpreting the freeze frame data will give y'all a better idea on what happened when the DTC occurred. The resulting data is useful in identifying the crusade of any fault related to the emissions organisation.

How does the OBD2 system shop freeze frame data?

In order to sympathize how an OBD2 system stores the freeze frame data, it is of import to sympathise the two types of organisation monitors.

1. Continuous monitors. This means the monitors are e'er running or operating continuously whenever the vehicle is running. Continuous monitors includes the fuel trim and the misfire detectors. It is often referred to equally a 'one trip' emissions diagnostic monitor and will enable the powertrain control module (PCM or vehicle ECU) to immediately store a diagnostic problem code together with the necessary freeze frame information.
2. Two-trip monitors or non-continuous monitors. These types of monitors such as the oxygen sensors, heaters, EGR system, evaporative emissions, and catalytic converter will perform a examination once per trip. But in the case of two-trip monitors, the PCM volition temporarily store a diagnostic trouble code until the next trip. If the failure does not occur during the 2d trip, the temporary trouble code will be cleared from the ECU memory.

But if the failure occurs again during the next trip, the ECU volition store a DTC along with the relevant freeze-frame data. Also remember that the freeze frame data will non be refreshed or updated subsequently succeeding failures on the same exam wheel. The freeze frame data will only be overwritten if the system detects an engine misfire or irregularities with the fuel trim.

Did the OBD2 lawmaking clear on information technology'southward own?

How does the OBD2 arrangement clear the freeze frame data?

Okay and so allow's presume the check engine light in your vehicle is ON. If the failure doesn't occur afterward three successive trips, the check engine light or MIL will be turned OFF. All the same, the trouble code and the freeze frame data will remain stored in the ECU memory. This is what'due south chosen automated clearing.

But what if y'all plug-in the OBD2 scanner and find no freeze frame data? This is unlikely to occur if the PCM triggers a check engine low-cal, but it can happen. If your automobile completes approximately xl warm-upwards cycles without detecting a error, the PCM will delete the trouble lawmaking and freeze frame data automatically.

Nevertheless, take annotation the freeze frame data tin also be overwritten by more important information related to continuous monitors such as engine misfires and fuel trim. Fault codes related to misfires and fuel supply will always take priority over other non-continuous mistake codes.

How do I read freeze frame data?

Information technology depends on the type of OBD2 scanner. If you happen to have a professional OBD2 scan tool such as the Autel AL519 or the Bluedriver, reading the freeze frame data is a piece of cake. It's really self-explanatory if you have a of knowledge on how a modern engine works.

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Entries such every bit air flow rate, engine RPM, fuel rail pressure judge, vehicle speed sensor, and Engine Coolant Temperature (ECT) are easy enough to understand. The data provides a snapshot on what the engine sensors are doing when the trouble code is triggered.

Merely what if y'all have a more than basic scan tool? This is where things become a bit more hard. Permit's await at what common Freeze Frame data looks like and so we'll break it downwardly:

• P0261 cylinder 1 injector circuit low
• DTC P0261
• Fuel SYS1 CL
• Fuel SYS2 N/A
• ….connected…

All those acronyms, symbols, and numbers are meaningless to the average automobile owner. So let'due south walk through each of them and explain em.

• DTC P0261 – This is the diagnostic trouble lawmaking, DTC, or Generic OBD2 Problem Lawmaking
• Fuel SYS1 CL – the fuel injector in bank 1 is in airtight-loop fashion when the mistake occurred.
• Fuel SYS2 Northward/A – ways there is no fuel injector in bank ii. This also means the engine is either a iv or six-cylinder with merely a single bank.
• Load Percentage 87 – the air book or corporeality of air inbound the motor that is below 100%.
• ECT 223 – is the Engine Coolant Temperature. In this case, the coolant temperature is 223 degrees F.
• SHrtFT1 two.6 – ways the short-term fuel trim is at 2.6%. (read more about short and long term fuel trim and live OBD2 data)
• Long FT1 -3.0 – the oxygen sensor or O2 sensor has not switched yet to long-term fuel trim for the fuel injectors.
• Map kpa 26.3 – is the reading in the manifold accented pressure level sensor or MAP when the error occurred. In this case, the sensor has a pressure betoken of 26.3 kilopascals.
• VSS 48 – is the speed of the vehicle when the DTC occurred.
• Rpm 1495 –  is the engine revolutions per minute as the error occurred.
• IAT 57 – Intake Air Temperature is at 57 degrees F when the PCM detected the diagnostic trouble code.

At present, take note the information stated higher up may differ according to the make and model of the vehicle, the OBD2 protocol of the vehicle, and the type of OBD2 scan tool utilized to read the freeze frame data, simply this should be a practiced general caption to get you rolling!

Can I manually clear freeze frame data using an OBD2 scan tool?

Yes. All you demand is a quality scan tool like the BAFX or Bluedriver to manually erase all related trouble codes and freeze frame information. This procedure will also turn off the bank check engine calorie-free in the musical instrument panel. Simply follow the instructions in the OBD2 scanner to erase or clear the information. Here's some guides to choosing a good scanner –

• OBD2 scanner for Android – You'll besides need an app like Torque Pro (paid) or Torque Lite (free)
• OBD2 scanner for iPhone/iOS – You'll also need to download an app like OBD Fusion
• Corded OBD2

However, if the problem is not fixed, the bank check engine low-cal will return together with the error code and relevant freeze frame data. This is the reason why yous should only erase or delete the DTC and freeze frame data only after the source of the trouble is fixed and/or replaced.

Vince

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Source: https://scanneranswers.com/how-to-read-obd2-freeze-frame-data/