hi all ive had a few problems with my xr

at first the fuel pump doesnt work but it does when i run a live from battery

also its not sparking at all

can any one help urgently

 

Try the CPS.

 

ok how can i check its working

 

Try another one, or if you are handy with a multi meter do a resistance check on it.

 

right ive got a multimeter how do i go about doing the check and what rerading should i be getting if it s working

 

Just set the meter to resistance and bung it on the terminals, i cant remember the reading but you will soon see if its gone, you may have to change to a resistance band of higher than 200 ohms.

If there is no resistance reading it has gone open circuit.

Let me know how you get on with that first......

 

is that with engine of or while its trying to start

 

Pull the plug off it, and test it, thats it (sorry )

 

so im checking the actual connector not the unit its self is this correct

 

No you want to test the actual sensor. So you need to pull the plug off, and test on its terminals (the reason for disconnecting the plug is the meter will more than likely give a reading for the components inside the EDIS4).

It may be tricky to get at it, its got a single torx bolt holding it in if you can get it out?

 

i tested it with the meter set to 2k ang got a reading of .248

 

Hmmmmmmmmm, sounds like an ok reading.

Next test (your guna love this)

You've got to somehow hold the terminals on the sensor, while at the same time being in the car to turn it over........... Set the meter to AC volts, and you should get a voltage reading. (unplugged again)

(Probably wise at this point to employ your glamorous assistant to turn the car over )

 

right cheers ill get back to you with that reading aasap as i dont currently have a glamorous assistant

 

Seems to be a bit of a global shortage on them

 

right thanks for you help so far ill probably get back to you tomorrow cheers

 

No problem

My MSN addy is there if you need it

 

right did voltage check and the reading was nothing i left it a while and eventualy it was 0.01

 

Double check that resistance reading, just incase you had the probes touching or something.

You should see a substantial AC voltage reading (check you were on AC volts not DC)

You could also take the sensor out and wave something like a spanner past the front of the sensor, needs to be very close though.

There was a thread some time ago where someone had an XR2i which just suddenly stoped, his CPS wouldnt read the timing marks on the flywheel but would read metal objects passed in front of it, he never replied with the fault though

 

ok mate ill take it out when i get chance as cars in a lock up ill get back to you with the results will the tests still work ifits removed from car

 

ive just tested resitance and while still in car and it was the same reading and the pins were definatly not touching also i checked voltage and it came up as 0.09 when had multimeter set to 200 volts ac and 0.01 when set to 750 ac

 

Ah right if its on 200V AC then thats a reasonable reading....i think lol

Might be worth checking fuses next then......if the main ECU fuse has gone then i dont think the pump will operate. Could be your ECU packed up?

 

the fuse hasnt gone but the car hasnt run since the conversion so dont think it will have had chance to go unless it had gone before i bought it

is their anyway of checking the ecu

 

ive done voltage and resistant checks on the ignition coil , crank position sensor , edis4 and ht leads and their all fine ive also bought new sparkplugs (motorcraft) and it still wont spark it just cranks over and over and theirs no spark at all

any ideas mate ?

 

safechav
You really now your stuff

 

If you are 100% the fuse for the management hasn't gone and there is definately power to it (should have a relay controlling it) then i suppose all is left to try is the ECU. I don't think theres any home made things that will test the ECU although that said a diagnostics tester should flag up a faulty ECU.

I have a spare 1AFA ECU, (asuming yours is not turbo)

Nah do i fuck The tuners are the people that know they're stuff (well most of them ) I try to help out where i can though

 

definate the fuse hasnt gone but havnt tested relay as i cannt work out which one is the engine control relay as its not listed in manualas having one


how much do you want for ecu inc postage and does it defo work
also could it be a weak starter as it doesnt seem to crank as fast as it should but that could just be me lol as wouldnt this affect the crank senor not getting a correct reading

 

There should be a control relay. Did you say the engine is a transplant? The relay is usually red.

If its not cranking over fast enough then it is quite common to cause problems as the CPS doesn't produce a good enough signal for the ECU to work with, but however seeing as the fuel pump doesn't run either that would point more to the ECU being at fault.

 

theirs 1 red one which is about twice the height of the others but its listed as wiper delay relay apart from that their aint one and in the maual the only other relays that arnt to do with the lights or heated screens are

cfi delay relay
ignition switch
automatic transmission starter inhibitor/electric fuel pump(bridge fitted to carburettor engines without automatic transmission)

 

check then thin earth wires that bolt onto the battery if if they look suspect then replace them

 

check the fuel pump relay under the dash i had a simular prob with my frst i drove around with a perm live runin 2 my fuel pump from battery for a bit till i realised what it was

 

The double height one is the Wiper relay. Just checked on the wiring diagram and you're right, i thought the relay controlled the ECU, must have traced it wrong last time i looked. There is definately a red relay under there though, same size as the yellow one, they both work together in series check them!

I stick reckon ECU though.

The thin wires is a good suggestion too

 

thin wires are fine

the only red one ive got is the wiper one i have a green one next to the yellow one ( fuel pump) the green one is ignition switch which will activate the fuel pump relay ie when it primes

 

Somethings not right there

There should be a red relay, and IIRC it has a delay switching on.

 

do you reckon if i get the red relay it will work can the relay be affecting it though as it clicks each time i turn the ignition and everything on car works apart from spark and pump

also whats IIRC mean

 

Just to clarify is this a totally original XR2i or is it a transplant cos ive got this trnasplant idea at the back of my head.

IIRC means If i remember correctly sorry

 

transplant but i bought all the items from the same xr2i which was broken due to nackered shell

 

Ah so its still a Fiesta then and has all the original wiring etc?

 

yes its been put into a 1.3 cfi fiesta

 

Hmmmmmmm

Thats wierd. What wiring diagram do you have then mate? JUst wondering? Theres a variation on that red relay, like a revised relay i think, but should be there

 

the haynes manual