Very strange code!!

[scott-richards27]

As above , having a very odd code on my 04 182 cup.

Code in question is " flywheel target " now I changed m crank sensor and it still occurs.

When cold the car is so hesitant it hardly drives. When warm under 4k rpm it splutters and is very slow. At 5krpm pulls like a train , at 7k limit it has a very flat / not right limit.

Could someone please help me, I'm on the verge of selling it because of this

 

[MicKPM]

Scope it and see what the actual signal wave form looks like.

You sure you got the wires the right way?

 

[scott-richards27]

What do you mean signal wave? I don't understand?

 

[SBV116]

What tooling are you using to read the code?

 

[MicKPM]

What do you mean signal wave? I don't understand?

I'll try to explain but before i do, do you understand the basic role of the CPS and how the ECM treats the information it receives from it?

Has any work been done to the car prior to these poor running symptoms occurring?

 

[scott-richards27]

Reads when the pegs on the flywheel are in position and tells the car to spark?

And yes , I have catcam 428s and a map. Other than that the boy before me changed his crank sensor too. Iv not got the modified one with the loom though. I have a motor factor part.

 

[MicKPM]

Okay, so we've got a map. How long ago was this done prior to the problems starting? I'm not trying to blame it but need a rough idea so it can be ruled out.

We're the symptoms identical with the old CPS on or has it changed since fitting the auto factor CPS?

Mick

 

[scott-richards27]

Year go by ktec. And no new sensor hasn't change a thing. Had a dealer map sensor fitted a week ago too. No difference.

 

[MicKPM]

Then the first port of call really needs to be a proper diagnostic session and go from there.

 

[scott-richards27]

Already done so

faults indicated are.
Engine codes
: flywheel target
Abs circuit.
: injection multiplexed malfunction.

 

[MicKPM]

No, you've done a "code reading" session which has bought up a code relating to the flywheel target but hasn't offered any further explanation on the fault or how to resolve it.

Like I said in my first post above the flywheel signal really needs "scoping" to see if the generated waveform looks good as a picture tells a far better story than some random numbers that change every micro second would. Now an Oscilloscope isn't something that all garages have because they are pretty bloody expensive, which is why some places only have one between five or more techs (if they have one at all). This is because they don't consider them "diagnostic" equipment worth investing in and a code reader will get them thru every occasion (which is wrong... Wait till hybrids/EV's start arriving) and finally, they probably wouldn't know where to start with one. They are however (IMO) the second most important piece of kit a proper diagnostician can have in his/her tool box with modern cars... Maybe more so than a volt meter.

So if you have access to a "scope" you need to set your pickups/triggers, voltage and time scales then crank/run the car (preferably from cold so it runs like a bag). Then if you've setup the scope correctly, from the generated waveform, you should be able to see the following:-

If the waveform looks good and shows a clear 60-2 "trigger pattern" then there's either a wiring fault, an ECU fault or the problem lays elsewhere (such as the flywheel itself).

If it doesn't then either the sensor is buggered (which you have kind of ruled out as its already been guess replaced) or there is a wiring/electrical "noise" fault in the main engine loom which needs to be found.

Mick
Diamond Motors

PS, does the ABS function okay?

 

[scott-richards27]

I have found a lad with one of them scopes.


And no, it's comes on when I give it a bit on a bend. Traction lights always on too.