ECU / relay problem

Site Subscriber Joined: 16 Dec 2004 Posts: 58

morning all

After just getting back after a 14 hour jouney, three different AA lorrys,over 360 miles i am looking for a shot in the dark.

I have a megane 1.6 rn s reg with siemens ECU.
the car started to cut out while driving along, then cut out totaly.
the fuel injector/fuel pump / (something else ) relay is switching in and out (ticking). the output from the ECU to the relay in also pulsing.

and help would be very useful. will be trying another ECU later.

Site Subscriber Joined: 16 Dec 2004 Posts: 58

just a quick update ( still need help )

when i unplug the fuel pump the ticking stops ???

new ECU ,,just the same ticking
new relay ,, just the same ticking
unpluged all the injectors ,, just the same ticking

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

I assume its a quick ticking? Like an indicator tick?

siezed fuel pump.

stick a halogen headlight bulb in its place, it should be a decent stable current draw. It should when you flick the ignition on light up for a second or 2 then go out, then when you try and crank it it should coem on and stay lit.

If so and no more ticking then pumps goosed.

Site Subscriber Joined: 16 Dec 2004 Posts: 58

chris when ingition is on the bulb ticks at the same speed as the relay. (appox speed of tick is?? fasher unit with a blub missing)

when trying to crank over the blub just goes dim.

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

hmm intresting.

take the relay out and bridge it. can you hear the pump going? Or if you have the bulb in does it glow ok then?

This might be as simpel as a crank sensor problem which is seeming likely.

Site Subscriber Joined: 16 Dec 2004 Posts: 58

took relay out and bridged it. ,, nothing from pump

bridged relay, while relay in the car (on rear ) ,, pump running ALL the time.

put metre on the live of the relay ingnition off 12v to earth

put metre on white and appox 2000 ohms to earth

put light across relay ,, bright when ingnition off ,,goes dim when ingition off.

Crack sensor ?? where the hell is that Crying or Very sad

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

crank sensor is on the bellhousing.

anyway get it so the pumps running all the time and try and start it.

If it won't fire up, see if the rev counter moves etc. If it doesn;t fire up then crank sensor is probabl;y duff.

You checked the earths? Theres 2 round the back of the engine, which if dodgy can damage the ECU.

Site Subscriber Joined: 16 Dec 2004 Posts: 58

F**king ace

found it

You checked the earths? Theres 2 round the back of the engine, which if dodgy can damage the ECU.

now thats two beers i owe you.. will pop in one day with my race car ,, as i pass glasgow around every month

Cheers Chris

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

good stuff.

Spammer Joined: 27 Jul 2004 Posts: 5717

goodman chris

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

aye almost as good as diagnosing and repairing JB;s chamade in the middle of edinburgh city centre when there was 5 of us in it! lol

Had to tape up the TPS wires.

Site Subscriber Joined: 07 Oct 2004 Posts: 2281

Legend.

Spammer Joined: 27 Jul 2004 Posts: 5717

did JB s chamade break down ? Shocked

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

well depends on what you class as breakdown, if nearly blowing the clutch and the fact it stuttered and it was cutting out a few times was it breakign down then yes it was.

I sorted it though! The team was behind me with support though Laughing

Spammer Joined: 27 Jul 2004 Posts: 5717

so new clutch time for the j.boy than ,oh joy Mad

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

nah its ok, my blue one needs a clutch though, badly, need to put my foot on the brake and smash it in.