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CITREON RELAY HDI P0380 ?

Posted By snap-on 12/3/2010 7:46:42 AM
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snap-on
 Posted 12/3/2010 7:46:42 AM
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Have a relay hdi 2litre on a 52 plate rhvcode . has bad starting first thing in morning when very cold and have fault code p0380 . have changed glow plugs but still bad starting . aa used easy start and it goes right away .

Checked first thing in morning and had live feed at glow plugs , then once started its fine for rest of the day , and then does not have a live feed to plugs once its started as normal . have 12v into relay but didnt check voltage at plugs as it was live . should there be 12v at plugs or does the relay cut voltage down ?

after cranking for a few minutes first thing this morning it started but was inside garage so not as cold .

many thanks

Angus
 Posted 12/3/2010 11:18:11 AM
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Snappy

If the plugs are new and are being fed 12v for a few seconds pre-start and a few minutes post-start; then the system is working.  Are you still getting that same code?

Bad cold starting could also be excess leak-off from one or more injectors; low compression; or just not cranking fast enough - battery healthy and the right spec - and is the earth-strap eaten away where it's bolted to the bell-housing?  [A classic on these.]

.

scannerMANners
 Posted 12/3/2010 4:39:05 PM
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Snap On its unlikely to be a glow fault on a HDi system. Check your "spill" rate, will probably reveal the fault. Other things to consider would be cranking speed and good compressions.
snap-on
 Posted 12/4/2010 1:31:07 PM
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did not check for codes originaly as breakdown company said it just needed glows ! the following day it wouldnt start again so out they came with easy start and away it went . it cranks over fast enough but just takes ages to fire .

checked for codes when it came back and pulled the p0380 . have not cleared code as yet , could this be the cause of bad starting still as code not cleared ? there are no fault lights on dash either .

when ign turned on you also here the fuel pump prime and once started in the morning its fine for the rest of the day .

thanks

Angus
 Posted 12/4/2010 2:32:11 PM
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Snappy

It's more unusual to not see P0380 on these.  So common it doesn't even put the MIL on.

They don't use the glow-plugs at all to start unless it's very cold; but run them for about three minutes post-start for emissions reasons.  That's why they've nearly always got at least one plug burned-out and often a cooked relay too.

Check cranking speed and rail pressure in live-data when it won't start; you need at least 300 revs and 120 bar before the ECU will even get interested in firing the injectors.  It also needs to see cam/crank synch - belt loose?

If the rail pressure is low, do that leak-off test; also ask the owner if it's even been mis-fuelled or run on "bio-diesel..?"  If so remove the filter and check for steel frag....  If found; do not refit the filter - change the whole filter housing and tell him he needs a mortgage....

If it has bad compressions, it will spew clouds of white smoke on cranking - does it?

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snap-on
 Posted 12/4/2010 3:28:51 PM
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No white smoke on cranking . the only time it doesnt start is when its cold first thing , when i test for live at plugs with ign on it the glow lights on dash for about 3seconds and at the plugs it stays live for about 10 secs only then relay clicks off . once started and run for a few minutes and switched off there is no longer a live at plugs until you go back first thing next morning .

will have to check rail pressure and crank speed on monday .

Angus
 Posted 12/4/2010 4:46:35 PM
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Snappy

Ten seconds!  Wow; it is cold round your way.

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snap-on
 Posted 12/5/2010 3:36:50 PM
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Thanks angus will check readings in the morning and report the findings soon as possible.
You will have to pm me your paypal so i can send you some beer tokens! god knows how you guys know so much on here, its good to know there is help out there cos not working for a dealer we dont get any info or up to date training on all this crazy stuff!
Read your recent post about the volvo break light problem and i was totaly lost with all that wiring stuff! dont know how you do it!
snap-on
 Posted 12/6/2010 1:59:19 PM
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right , fuel rail pressure was 158 bar and cranking rpm was 374 . desired pressure 369 and actual 362. it started fine too with around a 3second crank . earth strap also good . vehicle now gone as it was needed for work so couldnt solve at this present time .
12/6/2010 2:04:09 PM by snap-on

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