pscan.uk

You need to connect the red crocodile clip to battery positive and the black crocodile clip to battery negative.

There needs to be a green flashing light on the interface box.

If the light isn't flashing, then it won't work.

AustinRover wrote: I was able to get pscan running but when trying to connect to the ecu it will say after a few seconds "interface failure".
can anyone help me troubleshoot this problem? Thanks!

Is the interface plugged into a car and powered up with the green light flashing?
Most of the electronics in the interface are powered by the car.

Yes it appears that it is just a second method in the diagnostic protocol for adjusting the same thing. That was my conclusion.

From me. I will send you a PM.

stepper motor stops is a prime example.

The ECU is trying to hit a certain idle speed. The exact position of the throttle body for a specific idle speed will depend on a number of factors such as air temperature, coolant temperature, and the mechanical tolerances of the throttle body.

The ECU will try and "learn" what normal looks like so that it can hit idle quicker without having to hunt for it every time.

These features are reverse engineered from a factory MG Rover T4 diagnostic tool.
The answer to the question "what does the feature do?" is, the same as a T4.
I can't tell you what is going on in the inner workings of the ECU because I don't know.

I can only guess, and here is my guess:-

Normally ECUs will "learn" the input signals from sensors in order to compute out unknowns such as the tolerances in the sensor signals, or other things outside of the manufacturers control such as fuel quality. Essentially if they have two out or three sensors saying the same thing and the third is 5% out, then the ECU will "learn" that the third one is 5% out and calculate everything on that basis.

There will be a limit on this adaptability. If a sensor is 50% out then that means that the sensor has gone bad or something else has failed and then the ECU will enter an error state and log a fault code.

I enterpret resetting adaptations as meaning that the ECU forgets all of the tolerances that it learned and starts again.

If the learning algorithm is perfect then it wouldn't matter but maybe it isn't. Maybe there are corner cases.

My guess is that the intended use is that if a technician changes something, like fitting a new sensor, then reset adaptations makes the ECU relearn from the new situation so that it gets there quicker.

I also had a turbo seized solid on my Jag 2.7 diesel.
It would idle absolutely fine, and I could drive slowly as well.
The moment I tried to get any real power I got a very harsh diesel knock.
I also had zero airflow on that bank of the engine.
I think that they engine was able to draw a certain about of air through the one good turbo but the moment this was exceeded it did something odd to the injection timing or something and made a very harsh noise.

I have experienced a similar problem with HDI powered Peugeots. On these the boost control solenoid can go bad and the ECU attempts to make the turbo do something but actually the wastegate stays wide open and doesn't make any boost.
I don't know whether the L series has a boost control solenoid or not.
Another common failure on VWs is with Mass Airflow Sensors. The ECU will not inject more fuel into the the engine than there is air to burn it, and so if the MAF is not working correctly then it reduces power.
Also make sure that your EGR valve isn't stuck open.

These are just guesses though as I have never owned an L series.

Looking at what pscan can do here are the live data parameters that can be monitored



Manifold pressure is there, you can check that you are getting boost.
Pedal position is there, make sure that it goes to 100% when you floor the accelerator.
Air flow is there: maybe compare with another owner of a similar car.

If you like you can send me one of the ECUs and I will power it up on the bench and get pscan talking to it.
You can then replicate the setup where you are and then compare what's different on the car.

Check that the ECU is receiving power and a good earth.