hi again. just been out in the garage messing with the Z

think im onto a winner with the det sensor. when i measure one of the tails to earth i get 549k ohms the other one seems to be open circuit. does this mean its fookt? i get +4.8V across the ecu tails and one of them is dead short to earth. i tried to frig out the sensor with a 2Meg pot adjusted to 1meg but it didnt work, i take it the resistance has to be exactly 1meg to go healthy?

will get a 1meg resistor 2mrrw and have another go when im in a better humour

Possibly you have a pressure fault on the cable braiding, easy way to check it out is to try the 1 meg resistor at the ecu end, locate the correct cable ( into the ecu ) and cut it so it is not connected to the sensor anymore and then connect the 1 meg resistor between the cable going into the ecu and the other end to a good earth, this is of course a test and not a fix.

 

One thing though you will need to do is disconnect the battey or ecu for a few hours so as to clear the code 34 before trying it or you will keep getting the old code.

 

Jeff TT

cheers, have disconnected the battery, will leave it off over night and have another go tomorrow

http://zhome.com/ZCMnL/PICS/detonationSensor/detonationSensor.html

One thing though you will need to do is disconnect the battey or ecu for a few hours so as to clear the code 34 before trying it or you will keep getting the old code.

 

Jeff TT

 

 

Or reset the ECU if you want to test straight away. :cool:

vijay: cheers i found that earlier its a good article

what is the quick way to reset the ecu? i thought the only way to do it was to leave the battery disconnected for a few hours?

well any way i went back to it this morning and looked at the codes and im still getting a 34(expected as i havnt actually changed anything) and a 13 (see thread on 'aint feeling like 280hp supercar')

the funny thing is with the temp sender is that ive cleaned it, im getting 4.8V to it and im geting a resistance across the sensor. when i start the engine with the connector off the fan starts which is fair enough, then when i plug it back in the fan stops, so youd think that the ecu was happy with the signal, but i still get the damn fault!! is it because its not at operating temperature and its looking for a value round about there? and because its cold the value is too high/low so it flags a fault?

will go to Abdn today and get a 1meg resistor

can i frig the temp sender with a resistor to check the code clears?

Quick way to reset ECUhttp://www.twinturbo.net/ttnetfaq/FAQpages/ECUdiagnostics.html

 

If I am not mistaken you just repeat test procedure

 

As a point I get fed up scrabbling around and lifting footwell out, the last time I ran diagnostics check, I used the wire method, the diagnostic plug is loose on a cable in the right hand side of the drivers footwell and requires no tools to access, pull it down short out two terminals Ign/Chk (bottom left pair) for three seconds this is just the same effect as turning the screw left to right on the ECU. ;)

good idea its a pain in the hoop getting under there. i might get a push button switch in maplin when i get the resistor and solder it on to some pins that fit in the ign/chk point. that way i can do it no bother any time. i have a feeling this definately wont be the last time i need to pull codes on the Z :cry:

will try resetting the codes the quick way

Thats a good idea I might adapt that myself, if you struggle getting hold of the resister give me a shout, I've got some cause my det sensor cable got sheared off last month having the engine refitted, in fact the guys got the engine out again now to replace it and fix an oil leak. :rolleyes: zed ownership :rolleyes:

cool thanks for that il see if i can get one, i might just get a handfull while im there. good luck getting yours sorted out!

right guys, before i left for town, i had one more play about with it. I used the shorting the connector method and it worked a beaut! it seems that leaing the battery disconnected overnight wasnt enough for the ecu to reset. the online manual does suggest 24hrs.

Dave, i did as you said and repeated the short, then checked the codes and got the 55!

the det sensor might be tempremental, but il keep an eye on it. will install the push button switch later should be useful

 

its a valuable lesson ive learned, as it gave me the run around last night trying to find faults i had already fixed.

 

Cheers for all your help folks,

Fraser

Isnt it good when it all goes well, glad its sorted.