KMS Reading 22.1
 

My car wont start,it just coughs and splutters and the KMS wideband display is showing 22.1

Does anyone know what it could be?

bad earth mate. you need to earth the display directly...

also have you set the throttle pot?

Well it was working fine before so I'm assuming it's not the earth to the display?

How would I find the earth to the display?

Set the throttle pot?no didn't know you had to?

im not sure on the display stuff as i dont use all that shit at work..
im sure gd16 will be able to help you though


you will always have to reset the throttle pot as the tiny'iest of movements by the actual sensor throws the voltage out to the ecu.
so you have to get the laptop out and connect it to the ecu and do a tps reset where you hold the pedal on full throttle then loose it and the ecu will then know the values it needs.

I will try and do that tomorrow.need to find a serial cable first.

Does the car need to be running to reset the throttle pot?as obviously it doesn't work at the minute.

no just the ignition needs to be on.:y:

Ok I will get a serial cable and do that. Could the 22.1 error be any earth or just the display?

its an error because of a bad earth from the display from what im aware. its happened to about 3 people i know now.

I will hunt it down and hopefully fix it,if it is that I guess we must have disturbed it.

Thanks for the help danny,I hope that is what it is.why would it stop the car running though?

no mate, if you have it mapped properly, wideband lamda is not needed.
on all the kms ecu's ive installed ive never used the display part as its so tempramental.

Well the car isn't mapped for the throttle bodies but it's not actually running.it just coughs and splutters and won't run,is that not related to the kms error then?

i very much doubt it mate, it will be the map and tps needs caliberating.

you ideally need a base map to work with or you are going to find it tough..

Well the car was running.So I know it works,but I had only wired the throttle pot up temporarly.so then took the pot off and wired up again and the car hasn't worked since.

If i don't reply back to this - PM me as i don't check on here too often.

Just to double check a few things - you've had this car running with the KMS previously? Running as in idling, or running as in driving? Since then - the only change you've made that would effect the engine/settings is that you've changed the throttle cable?

First off - we'll try get the car running, then sort out the wideband after that (if its mapped accurately, it shouldn't need the wideband for 90% of the time).

First we'll stop the KMS from 'listening' to what the wideband is telling it. Basically when the display shows 22.1, this is the signal its sending to the KMS. 22.1 means lean, so the ECU will try chuck in a load of fuel to try and make it richer - if the sensor is faulty, it'll always read 22.1 therefore the KMS will continue chucking more and more fuel in - flooding the engine.

Easiest way to stop the lambda signal getting to the ECU is disconnect the 3 pin plug that joins the two. (Display should have a 9 pin serial lead, single pin earth, 6 pin connector for the lambda - and a 3 pin weatherproof connector, black casing with yellow seal IIRC)

If you can't find that, doesn't matter - hook up the laptop, ignition on, load map from ECU. Go into F4, options, lambda - and at the bottom there should be a tick box along the lines of 'Lambda Control On' - make sure you untick this, so the KMS no longer pays any attention to the lambda signal. Go back to the main screen and lock the map to the ECU - the bar across the top will read 'DATA NOT LOCKED' until you do so.

Next thing to sort is the throttle position. Goto F4, options, engine load sensor. Engine load 1 should be TPS, next to it theres an 'Auto Cal' button - hit that. It will ask for the minimum entry - make sure your foot is off the throttle completly, and hit ok. Then it asks for maximum - put your foot to the floor so the throttle is wide open, and hit ok again. Go back to the main screen and lock the map to the ECU again.


Then try start the car - with any luck it should work. Although if you've been trying lots with it flooding the engine, spark plugs might be soaked - so worth checking/changing.

If i get a chance tomorrow - i'll reply about testing the lambda sensor.

Yes the car has been driving with the kms for the past two years. obviously the bodies have only just gone on.
I will try all of that tommorrow. I tried 3 or 4 times so is the engine likely to be flooded?

tbh this sort of stuff just hurts my head. I'd just get it towed to gmc and let John work his magic with it!

Well that bits sorted now. It turns out that the lambda Reading of 22.1 was the actual Reading. There was a problem with the fuelling and only two of the cylinders were igniting.

The problems now are the oil needs replacing as there is petrol in it.

Under partial load the car goes to stall before the revs increase.but i'm hoping that's because the tps hasn't been set