Glow plug circuit mystery/saga...

#1 by aegir71 , Wed Nov 04, 2015 12:36 pm

Hi There,

A while ago the glow plug relay circuit in my 93 L200 stopped working, the fuse was blown taking out the indicators/dashboard etc. I had an auto electrician out who told me the problem was the glow plug relay, which I sent off to be repaired, only to be told that it was not faulty. Got the auto electrician back when he then identified the fault as the solenoid (pic attached) which I duly swapped out and Hey Presto, It worked!! for 2 weeks…. I suspect the solenoid has now stopped working again but this can't be coincidence surely? when the fault occurs the relay box makes a demented clicking noise before blowing the fuse (see it here: https://vimeo.com/132909258), I have now tried a different relay in case it was at fault all along but the same thing happens.

I'm currently running the truck by by-passing the relay but its not a long term solution and its driving me bloody mental, suggestions would be very gratefully received!

thanks

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RE: Glow plug circuit mystery/saga...

#2 by 123hotchef , Wed Nov 04, 2015 12:43 pm

take a look at the wiring diagrams mate does the glow plug relay turn off as it should or is it constantly on, could be the temperature sensor


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RE: Glow plug circuit mystery/saga...

#3 by aegir71 , Wed Nov 04, 2015 12:49 pm

i don't have a wiring diagram i'm afraid, is the temperature sensor part of the relay box itself or is it a separate module?


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RE: Glow plug circuit mystery/saga...

#4 by 123hotchef , Wed Nov 04, 2015 12:53 pm

what relay box are u referring too


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RE: Glow plug circuit mystery/saga...

#5 by aegir71 , Wed Nov 04, 2015 12:58 pm

the one in the wee video i posted, the link is in the first post i did


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RE: Glow plug circuit mystery/saga...

#6 by 123hotchef , Wed Nov 04, 2015 12:58 pm


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RE: Glow plug circuit mystery/saga...

#7 by 123hotchef , Wed Nov 04, 2015 12:59 pm

Quote: aegir71 wrote in post #5
the one in the wee video i posted, the link is in the first post i did


I cant see the video I am at work its blocked ecu for relay in footwell


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RE: Glow plug circuit mystery/saga...

#8 by aegir71 , Wed Nov 04, 2015 1:06 pm

yeah,thats the one


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RE: Glow plug circuit mystery/saga...

#9 by 123hotchef , Wed Nov 04, 2015 1:07 pm

if it is clicking like you say it could be buggered can u unplug it from the loom and open the box and inspect the board for signs of damage

post some pics of the board both sides so we can see if you like


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RE: Glow plug circuit mystery/saga...

#10 by 123hotchef , Wed Nov 04, 2015 1:09 pm

Quote: 123hotchef wrote in post #2
take a look at the wiring diagrams mate does the glow plug relay turn off as it should or is it constantly on, could be the temperature sensor


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RE: Glow plug circuit mystery/saga...

#11 by aegir71 , Wed Nov 04, 2015 1:09 pm

I've had it checked out and it was ok and i've also swapped it out with another unit which did the same thing when plugged in


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RE: Glow plug circuit mystery/saga...

#12 by 123hotchef , Wed Nov 04, 2015 1:15 pm

where did you get the new solenoid from?

do the glow plugs go out after there cycle


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RE: Glow plug circuit mystery/saga...

#13 by 123hotchef , Wed Nov 04, 2015 1:21 pm

id be checking the coolant temp sensor if the cycle aint as it should be cheap and easy to replace if need be


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RE: Glow plug circuit mystery/saga...

#14 by Mallinman , Wed Nov 04, 2015 1:23 pm

There is a common fault with the old glow plug ecu's on the pajeros. If you go on the poc forum there was a post about repairing it yourself. Can't remember fully but I think it was a blown capacitor or something like that. With it clicking like that tho it does sound like it's constantly switching on and off.


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RE: Glow plug circuit mystery/saga...

#15 by aegir71 , Wed Nov 04, 2015 1:23 pm

got the solenoid from ebay but it was working for a couple of weeks before the fault returned. The glow plug each light would go out when it was working but i don't know if this signifies the plugs cycle being ended or not. If the temp sensor was faulty would this mean that the solenoid was permanently engaged resulting in it burning out?


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RE: Glow plug circuit mystery/saga...

#16 by 123hotchef , Wed Nov 04, 2015 1:25 pm

yes it could happen that way if the temp sensor is playing up as that is tied in with how long the duty cycle to the plugs is via the ecu and solenoid


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RE: Glow plug circuit mystery/saga...

#17 by 123hotchef , Wed Nov 04, 2015 1:26 pm

could be an itemittiant fault with the temp sensor if the ecu has been changed and not at fault

u can check the temp sensor but for the age of it and for what they cost just swap it out


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RE: Glow plug circuit mystery/saga...

#18 by aegir71 , Wed Nov 04, 2015 1:34 pm

nice one! i'll give that a go, you don't happen to know who's currently selling them? had a quick check with no joy


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RE: Glow plug circuit mystery/saga...

#19 by 123hotchef , Wed Nov 04, 2015 1:39 pm

give k and s international or milners a call

failing that it will be mitsi


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RE: Glow plug circuit mystery/saga...

#20 by aegir71 , Wed Nov 04, 2015 1:44 pm

I will do, thanks very much for all your help, greatly appreciated!!!


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RE: Glow plug circuit mystery/saga...

#21 by 123hotchef , Wed Nov 04, 2015 1:47 pm

no worries pal I hope that's all it is and it is an easy fix for ya


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RE: Glow plug circuit mystery/saga...

#22 by aegir71 , Wed Nov 04, 2015 2:10 pm

no such luck i'm afraid, spoke to a Mitsubushi parts guy who's says that if the temp sensor was faulty the gauge wouldn't work as there is only one sensor on my model and not a separate item feeding the relay ECU. back to square one!


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RE: Glow plug circuit mystery/saga...

#23 by 123hotchef , Wed Nov 04, 2015 3:22 pm

Look at the wiring diagram they say different how do u think the glow plugs know if they need to cycle and how long for


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RE: Glow plug circuit mystery/saga...

#24 by aegir71 , Wed Nov 04, 2015 3:34 pm

could you point me towards a copy of the wiring diagram please, i'm a bit in the dark here! After poking about and following some wired I was thinking that the sensor on the top of the block at the front serviced the relay ECU, is this correct?


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RE: Glow plug circuit mystery/saga...

#25 by Warriorbez , Wed Nov 04, 2015 4:38 pm

What size is the fuse that is blowing


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