Back in December we covered Absolute Load and it's relationship with Calculated Load.
https://ggautobiz.blogspot.com/2025/12/obdii-data-absolute-load-value.html
This time we will take a look at how these data items and recording during a drive led to a diagnosis and repair for low power. No codes, no misfires but this 2015 Jeep Patriot just didn't feel strong on a hard acceleration. I've mentioned how the relationship between calculated and absolute load can help you spot a breathing problem. I took the scan tool on record along for a drive and was recording all data because I wanted to go through any that looked attention grabbing when I returned. I mention that because when you are recording ALL the data pids it can cause a slight discrepancy in the time line due to the time needed to exchange that much information. I did try a wot event. (wide open throttle) briefly and just looked for my peak of each of these at that time and pasted together for this article.
The Calculated Load reached 100% which means the computer recognized the need for power but the Absolute Load only reached 68.6 which is struggling to meet it. Now this is basically the ability of the engine to pull in air and expel it (exhaust) so indicates either trouble getting enough air or an exhaust restriction. But we can see here the Relative Throttle is only 21.2, for some reason that throttle isn't opening enough to allow enough air for the event.
I had a plan based on that alone. Look at these spark plugs, which were badly worn. Look at this air filter, which needed replaced and inspect this throttle body which needed cleaning. Cleaned the throttle, replaced the air filter and replaced the spark plugs. The next drive I only recorded those data items so got it on one view. Calculated Load 100, Absolute Load 95.7 and Relative Throttle 77.3............ Ready to Rumba!
Thanks for reading!
Kenny@GGAuto.Repair
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