Glow Plug problem

[Dinosaur]

Hi All

Triton MN Turbo Diesel MY10 (117,000km)

Currently out bush and after having lots of work done prior to this 3 month long trip,
the cold starting has not been resolved.
It takes about 6 to 7 seconds on cold mornings (4 degrees).
Once it has run for a minute or so it will start immediately as normal.

I won't get to a major town for at least another 3 weeks, and will only have internet access
every 5 days when I travel,so thought I would trouble shoot the cause.

There is no reference in the owners manual as to what relay if any is responsible.
Took off the plastic engine top cover and saw the 4 plugs connecting to the top of the engine.
I assume they were the connections to the glow plugs.

Measuring the first one, I get 7.8 ohm which from previous browsing appears ok.
However, when I measure the voltage during the "Glow Time" it is only 6v.
I thought the plugs were 12v ??
That voltage stays there for as long as I leave the ignition ON,
regardless of the "Glow Time" expiring.
Additionally, although the plug I measured is 7.8 ohm, it is not drawing any current.
Both leads to the Glow Plug are at the same voltage.
As I have extensive electronic experience, this must mean that another device downstream (Relay ?)
is not allowing the current to complete the circuit to negative.

I would have thought all 4 would have a common negative wire, but that is not the case.
There are 8 wires going back into the loom, so there must be more involved then simply
supplying 12v for a short duration.(otherwise I could bypass it manually until I can get it fixed)

I would love to see a circuit diagram, or get some guidance as to which relay (if any)
is responsible.

PS: I have a Scangauge and it shows no error codes, service guys didn't find any either.

Regards

[explorer.dave]

Have a look in the online user manual, I found a wiring diagram in less than a minute.

You will find the link in the Directory.
Hope that helps.

[NowForThe5th]

Circuit diagrams galore at http://faq.out-club.ru/download/l200_2006/maintenance/Service_Manual_2009_2013/2011/index_M1.htm

[explorer.dave]

Item
Standard value
Resistance between glow plug plate and glow plug body (parallel resistance for 4 glow plugs) (at 20°C) Ω
0.15 - 0.25
Voltage between glow plug plate and glow plug body V
Immediately after ignition switch is turned to ON (without starting the engine)
9 - 11 (Drops to 0 V after 4 - 8 seconds have passed)
While engine is cranking
6 or more
While engine is warning up
12 - 15 (Drops to 0 V when the engine coolant temperature increases to 60°C or more or if 180 seconds have passed since the engine was started)
Glow plug relay resistance (at 20°C) Ω
18 - 22
Glow plug resistance (at 20°C) Ω
0.6 - 1.0

[Dinosaur]

Hi all

Many thanks for the replies.
Just arrived back in coverage area and will search for manuals in the morning.
Unfortunately on 3G and iPhone hotspot.
But @explorer.dave, if the resistance values of 0.6 to 1.0 are correct, then I will
have to confirm my measurement and prove I didn't misplace the decimal point.

What I did, was to cut one lead of the first glow plug and stripped a bit of the second lead ,then measured the resistance between the leads. Never measured to the body or the negative of the battery.
Afterwards resoldered and shrink sleeved.

If there is a relay, then I am really disappointed that the owners manual didn't specify which one.

Regards

[SEJ GLX-R]

Now I may be way off because I haven’t had my MN 2.5 Triton for over 6 years but it sounds to me like you are checking the injectors not glow plugs.

If I recall correctly, the glow plugs on the 2.5 are hidden under the inlet manifold and quiet hard to get to.

I did have the same cold start issue on mine and it was just the fuse. It was blown in a weird way so I couldn’t see that it was blown, I had to test the fuse with a multimeter.

[Dinosaur]

Hi All

Finally back in signal range so I can respond and update.

@SEJ GLX-R , you hit it right on the button.
I did not know what I was looking at, untill I got the manual on line.
A picture is worth a thousand words.
When I found the relay in question I unplugged the glowplugsHi All

Finally back in signal range so I can respond and update.

@SEJ GLX-R , you hit it right on the button.
I did not know what I was looking at, untill I got the manual on line.
A picture is worth a thousand words.
When I found the relay in question I unplugged the glowplugs
and measured 0.8 ohm for the 4 in parralel.
Then found I did not have 12v on the feed wire on the relay.
The circuit diagram memtioned Fuse 24, but it was OK.
Traced the wire back to the battery terminal and discovered
the fuse-able link was blown.
Of course I couldn't replace that in the bush, so with an Inverter and soldering iron
I put a blob of solder on the gap.
The link looks like it still has another area that will act as a fuse, so the circuit is still protected.

All good now.
I had a major repair done a few months ago and I suspect thet they shorted the wire
and blew the fuse. I just didn't notice until it got colder.

Many thanks to all for the replies and links.
Hopefully the next 2 months of travel will be troubl free.

Regards