rentonone

iTrader: (1)

I have recently had this problem with the check engine light constantly on..

https://www.scoobynet.com/general-te...res-fault.html

i had codes 22 and 23 so i have changed both sensors (maff and knock). The maff sensor has now gone off but i still have the code 22 so i changed it again and still no joy, the connector looked a bit dodgy so i have fixed that too just to make sure, every time i reset the ecu the code 22 just comes back up.

Does this mean there is a fault in the circuit? how can i check it?

Thanks james

mit

iTrader: (10)

Hi, it's possible your sensors fine,and your getting a high knock reading,as this will give you code 23 also.Best get it checked before it gets expensive!

Mit

ReggieMY99

Could be historic codes from an unplugged maf sensor and knock

ecu reset should remove historic codes

jaytc2003

iTrader: (1)

reading the op post he has reset the ecu more than once.

I imagine the sensor works on different voltages etc so probably a matter of reading the voltages at various stage (at sensor and ecu)

Suppose it could also be an earthing issue as apparently scoobs do suffer from bad earths although I didnt ever experience that

rentonone

iTrader: (1)

thanks for the replies, i have checked the earths and they seem ok.
I have had a look at the wiring diagram and it shows just one wire from the knock sensor to the ecu, so is it the voltages i need to check? what tool do i need to test it? i have never really done the testing side of things before.

thanks

rentonone

iTrader: (1)

up

jaytc2003

iTrader: (1)

https://www.scoobynet.com/general-te...ml#post1049240

The post by ScottT tells you what the resistance should be. It appears the sensor is grounded when it is connected so maybe an idea to remove it again, give the mating surfaces a clean and then put it back

rentonone

iTrader: (1)

Thanks mate, in that post Scott T mensions fitting a 540k resister to the knock link connector to see if the light goes off, this sounds like a good idea, where could i get one from?

james

jaytc2003

iTrader: (1)

maplins will probably be able to sort one of them out for you, probably on a few quid max

rentonone

iTrader: (1)

cheers i will pop to maplins and have a look then, is there a specific type of resister that i need or is it just a standard one?

SetoN

where abouts is my knock sensor? I've tried looking as i thought id be able to find it after viewing one on ebay. I have a non turbo so i dont have a top mount. thought it was round there somwhere

rentonone

iTrader: (1)

The knock sensor is bolted to the block underneath where the intercooler would usualy be, it has a white conector.

rentonone

iTrader: (1)

Bit of an update, i have got hold of a 540k resister and connected the one side to the conector that connects to the knock sensr and the other end to earth, is this correct? if so it did not make a difference, also i have tested the voltages going to the sensor and it went 0.1 0.2 0.0 0.1 0.2 and kept doing the same round and round. is this correct?