P38, No glow plug light but glow plugs are getting power

Colleydog91 · Dec 22, 2021

Hi my p38 no longer brings on the flow plug light, when I turn ignition on the relay clicks and I have power at the plugs.. but no light on dash, the light does work though as I can bring it on using nanocom.

Colleydog91 · Dec 22, 2021

Glow plug, not flow plug

brianp38dse · Dec 22, 2021

There is a great big maxi fuse 80a iirc in the engine ecu housing behind the battery it looks like a flat bit of metal have a check of that.

brianp38dse · Dec 22, 2021

Here is a pic of a blown one

15905990006177752918474440247682-jpg.210548

Colleydog91 · Dec 22, 2021

Hi, yes fuse is all good , relay is clicking and the plugs are all getting power , just no coil light on the dash

Datatek · Dec 22, 2021

Colleydog91 said:
Hi, yes fuse is all good , relay is clicking and the plugs are all getting power , just no coil light on the dash

Bad connection somewhere. I'd have to check, but possibly the feed for the lamp goes via the BECM. Have a look at RAVE.

Colleydog91 · Dec 22, 2021

Looks like connection from bcem is good as I can force the light on using nanocom, its weird
Unless connection from engine ECU to bcem

tomcat59alan · Dec 22, 2021

Colleydog91 said:
Looks like connection from bcem is good as I can force the light on using nanocom, its weird
Unless connection from engine ECU to bcem

Check the big connector under the expansion tank for corrosion and the block connector's behind the A post kick panels

RangeRoller dt · Dec 22, 2021

ECU temp sensor okay? If it’s not connected properly it may take a nominal value thinking it’s warm so wouldn’t bring glows on.

tomcat59alan · Dec 22, 2021

RangeRoller dt said:
ECU temp sensor okay? If it’s not connected properly it may take a nominal value thinking it’s warm so wouldn’t bring glows on.

It powers up the glows just doesn't put the light on Jack.

Colleydog91 · Dec 22, 2021

Hi I will check the connectors, I have recently fitted another engine so that connector under the expansion tank has been unplugged and re plugged however the light was working straight after the engine change and stopped working a few days after.
I think the temperature sensor is OK as it does bring the plugs on just not the light.

Datatek · Dec 22, 2021

Sounds like it could be the link from the glow relay to the BECM

tomcat59alan · Dec 22, 2021

Datatek said:
Sounds like it could be the link from the glow relay to the BECM

But the question is which connector/s does the link pass through.

Datatek · Dec 22, 2021

tomcat59alan said:
But the question is which connector/s does the link pass through.

It will be in RAVE, if the OP does not have RAVE or cannot follow the schematics, I will look it up.

Colleydog91 · Dec 22, 2021

I will check all the pins in the big plug under the expansion tank tomorrow, that's the only one that had been disturbed, I take it I need to disconnect the battery again before I mess with it?

Datatek · Dec 22, 2021

Colleydog91 said:
I will check all the pins in the big plug under the expansion tank tomorrow, that's the only one that had been disturbed, I take it I need to disconnect the battery again before I mess with it?

That would be the safe option.
Check that the carpet and underlay in the drivers footwell is dry.

tomcat59alan · Dec 22, 2021

Always advisable.

Colleydog91 · Dec 22, 2021

OK, will do, I will let you know how i get on
Thanks

Colleydog91 · Dec 23, 2021

Hi, good news , it was a connection in the big plug under the expansion tank I gave it a wiggle and pushed it in abit and the glow plug light comes on again, thanks for the help
Now I just need to get the key to resync and all back to normal.

Datatek · Dec 23, 2021

Colleydog91 said:
Hi, good news , it was a connection in the big plug under the expansion tank I gave it a wiggle and pushed it in abit and the glow plug light comes on again, thanks for the help
Now I just need to get the key to resync and all back to normal.

Good news thanks for letting us know

P38, No glow plug light but glow plugs are getting power

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