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Author Topic: understanding tc codes  (Read 462 times)

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tidla

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understanding tc codes
« on: 06 August 2010, 19:28:43 »
been toying with the idea of getting a code reader, up till now i have subbed it out to a guy who has the expensive kit.
trouble is, there is no point in blindly following the codes without taking everything into the equation.

example.. mondeo 2.0 tdci, map sensor fault, customer changes 3 map sensors, (two from ebay) to find the real cause of lack of power is the gaping hole in the turbo pipe.

code is correct, air meetiing the engine(over fuel) does not match that being measured by the maf sensor.

back to the point.
andy placed a thread regarding dtc codes translation, which i had a look at.

a lot of the codes are either high voltage or low voltage?

what does that mean?

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TheBoy

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Re: understanding tc codes
« Reply #1 on: 06 August 2010, 22:12:28 »
high or low voltage means that the reading from the sensor is either too high or too low.

This may be due to it being outside the expected range, or it may be the reading is too high/low based on calculations from other sensors.


Remember, you shouldn't simply change what the code reader tells you to - this is the (expensive) mistake used by most dealers and garages.  This ECU is simply saying what it thinks it is seeing - the actual cause may be something else completely.

You need to view live data readings, and work out what is causing the flagged codes ;)
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tidla

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Re: understanding tc codes
« Reply #2 on: 06 August 2010, 23:27:36 »
Quote
high or low voltage means that the reading from the sensor is either too high or too low.

This may be due to it being outside the expected range, or it may be the reading is too high/low based on calculations from other sensors.

Remember, you shouldn't simply change what the code reader tells you to - this is the (expensive) mistake used by most dealers and garages.  This ECU is simply saying what it thinks it is seeing - the actual cause may be something else completely.

You need to view live data readings, and work out what is causing the flagged codes ;)

thats what i was after.

do you have a recent example of how the output from one device would be affected by another?

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