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Posted

First post so hi to all!

 

have recently purchaced a c4 1.6 16v (early 2007)

 

has been in crash and is a none starter (no feeds to fuel pump and coil),but does turn over on key.

 

also no battery light on,but no fault codes in ecu?

 

i am at a loss. :blink:

 

any help would be welcome :) .

 

Posted

Welcome to the forum.

 

I did think of a fuel shut off switch but a search suggests there is not one.

 

So possibly an immobiliser problem and you would be best to get your Citroen dealer to check it. No battery light could be the car is in eco mode and that will only reset once the engine has started (as well as other things such as interior lights and radio).

 

There have been people on here with similar problems and things such as the ecu have been replaced without fixing the problem - but none have been to a Citroen dealer to have a diagnostic check for the fault. I would not try an auto electrician since these have also been used.

Posted

car took a hit to the n/s/f  had abs pump replaced and wiring repaired (just needed a bumper and wing) i am an ex citroen tech btw (was ages ago ).

Posted

Our last C4 had a n/s front bump needing a wing, bonnet, bumper, abs pump which had to be programmed by Citroen for the accident repair centre, headlight. The wings are plastic so they easily break.

 

Possibly not all the wiring has been repaired or maybe there is something in the fusebox that needs replacing since that is in the same area.

Posted

Bugger! I could have helped you here!

 

I fitted a ABS pump and wiring to a Berlingo taxi after an accident and that was also a non-start afterwards but I had the next week off work (this was a Saturday) and someone else completed the job. Only recently left Citroen to work with Vauxhall so got no way of asking the tech who done it what was wrong.

Posted

Bugger! I could have helped you here!

 

I fitted a ABS pump and wiring to a Berlingo taxi after an accident and that was also a non-start afterwards but I had the next week off work (this was a Saturday) and someone else completed the job. Only recently left Citroen to work with Vauxhall so got no way of asking the tech who done it what was wrong.

Bugger indeed! it seems that i will need to go to stealers...so annoying if only i had lexia!.... think that would sort it ,it would appear from inquirerys that abs ecu needs resetting or summat!

Posted

In the C4 Haynes manual for the hydraulic valve block/modulator/ecu unit replacement on page 9.19 it says: 'new ecus must be initialised and programmed using Citroen dedicated diagnostic equipment'. You also need this to bleed the valve block so if you do go to a dealer then get them to do all this as well as check for the no start cause at the same time - just in case it is nothing to do with the abs.

Posted

To bleed a ABS block, you must have Citroen Diagnostic Equipment, 2 people and a huge quantity of brake fluid ready!

Posted

To bleed a ABS block, you must have Citroen Diagnostic Equipment, 2 people and a huge quantity of brake fluid ready!

did not replace the whole abs block just the ecu,so no bleeding needed.

Posted

Any time any ECU is replaced, it requires configuration by Citroen.

Posted

cant remember if the c4 has them but check all the fuse boxes for a fuse marked SH. Its a shunt fuse this pull it out and this will reset the ecu for you. but b4 you do it might be worthwhile spending a hour or two with a multimeter making sure you have power to the likes of the crank/cam/coilpack (settings/readings on youtube/google)  also check the wiring repair also is the alarm/imobilizer working.

check for power going into the alternator as this is a big clue that systems arnt getting charged up prior to starting

Abs ecu shouldnt stop the car from starting.

so your way foward with this is to download pin data for a c4 then sit with a multimeter and a few cups of tea. the pin data will tell you lets say the camshaft sensor wires what pin number in the ecu multiplug goes to that sensor then put one end of the multimeter on that pin in the ecu block and the other on the pin in the camshaft sensor multiplug and check for continuity and i think youl find a few wires not correctly repaired

Posted

Any time any ECU is replaced, it requires configuration by Citroen.

But would abs ecu stop it starting? someone else has suggested to me the under bonnet fusebox could be the cause,i am well capeable of checking lives/earths and have access to "official" citroen wiring diagrams,but dont know what feeds under bonnet fusebox should have.... :rolleyes:

Posted

u need to check that the wires from the ecu to the sensors that the engine needs to start have been joined the right way. a lot of people go by the colour of the wire but that is not the case u must go by the number printed on the wire as one wire can change colour from were it starts to were it finishes.  on ur original post you say there is no fault code so im assuming you have diagnostic tools. codes wont help you with a non starter you need to go into live data and see what the engine is doing when its trying to start

Posted

u need to check that the wires from the ecu to the sensors that the engine needs to start have been joined the right way. a lot of people go by the colour of the wire but that is not the case u must go by the number printed on the wire as one wire can change colour from were it starts to were it finishes.  on ur original post you say there is no fault code so im assuming you have diagnostic tools. codes wont help you with a non starter you need to go into live data and see what the engine is doing when its trying to start

i am well aware of the wire number system and have checked continuity on all relevent wireing,am going to check live data shortly see what i get

Posted

well u seem to have it all in hand now so il leave u to get on with it

sorry if i seemed a bit like i know it all...i dont.

anyhow got back to it this morning

wiring all as it should be immobilliser coming off have signal from engine speed sensor

 

ok so have got back to it this morning,and i have:

 

No Battery Light. or oil or water....

 

@underbonnet fuse box (all ign on):

 

ign power 0v

 

lambda heating 0v

 

injectors 0v

 

injector ecu power supply 12v

 

engine power relay 10.7v (live all time)

 

main relay control .9 (live all time) .this become 12v if engine ecu disconnected (with the inline connector)

 

canister solinoid 0v

 

 

fuel pump control 0v

 

high speed canbus .3

 

low speed canbus 11.1

 

hands free starting 10.4

 

can + supply 12v

 

maxi fuses ok all earths on under bonnet box ok.

 

there something not right but cant see it yet.

Posted

also nothing going to alternator (no live)

:blink:  :blink:  :blink:  :blink:

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