21/11/2025
This 1KD-FTV powered Toyota Prado came in with the customer complaint of being low on power, and they were dead right !
A quick look at the data showed the MAF and MAP numbers to be reading lower than I’d expect.
I had a look at the air filter and found it to be pretty bad, some parts almost completely blocked.
I gave the MAF sensor (air flow meter) a clean, it was pretty filthy too.
The MAP (Inlet manifold pressure) reading also looked a bit low, on further inspection I found a crack in the MAP filter so this was replaced.
Even though this car would have been making the right boost pressure all along, the ECU was only being told a much lower reading due to the cracked MAP filter. This results in the ECU thinking the engine is at a lower load point than it actually is and will not give the correct amount of fuel for the 200Kpa load point, resulting in low power.
I went for another road test to check the data and it was much better than before. The MAF reading was up to 260 grams per second from 150 grams per second and the MAP reading was up to 200Kpa from 150Kpa.
It now makes significantly more power than it was now that it’s seeing the correct readings from the sensors.
I also replaced the fuel filter as the sample had quite a lot of dirty particles in it. This wasn’t part of the low power problem, just maintenance.
Keep it simple:
If it can’t suck air it won’t make full power.
If it can’t accurately read airflow or full boost pressure at the sensor then it also won’t make full power.
