Volvo Control Instrument Panel- keyless start

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jackho

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Further to my original post re: Glow plugs remaining on after start up - having changed the glow plug relay and toggle sw the problem still remains.
The startup cycle is normal but when the engine runs the glowplugs are re-energised hence the need to get a schematic or wiring diagram of the layout.
(or any other advice). The schematics in the workshop manual are not very coordinated so some more info would help.
In the meantime I disconnect the wire onto the glowplug rail after starting engine.
The engine is D1 30 with keyless control panel.
thank you in anticipation. Jackho
 
Do you know which specific version of the D1-30 it is? There's an additional letter describing the version, A to F (possibly more now?) and I believe the electrical system was the major item that changed.

Pete
 
In you previous post:
Hi folks ... any ideas on this problem. after engine starts the glow plug light comes on. Works initially to start engine , goes off after engine starts and then after about 10secs. comes back on again. I have replaced the toggle switch as well as the glow plugs relay but this hasn't cured the problem.
I haven't been able to get a meter accross the glow plugs to see if they are energised but kind of assume there not as I have been motoring quite a bit without any issues that I am aware off. (I note that the drawing I have only shows press,temp. and ignition on the alarm test )
any ideas would be appreciated.
Click to expand...

You already said you had replaced the relay and the toggle switch but that you had not been able to get a meter on to the glow plugs to see if they were energised but were assuming that they were not. Do I deduce from the fact that you now disconnect the wire from the glowplug busbar ( Red 2,5mm² wire ??) you have now been able to check and have discovered that they are in fact re- energising .
The glowplug indicator light on the panel presumably remains illuminated?

What tests lead you to suspect the switch ?
What tests lead you to suspect the relay ?

Have you ( can you?) checked that the relay is being energised via the orange wire or is there a supply being fed back to it from the electronic module via the red/ green wire ?

The wiring diagrams I am looking at are in the manual on line at https://j109.org/docs/volvo_d1-30_workshop_manual.pdf but I assume they are the same as the ones in your manual
 
prv said:
Do you know which specific version of the D1-30 it is? There's an additional letter describing the version, A to F (possibly more now?) and I believe the electrical system was the major item that changed.

Pete
Click to expand...

I am assuming from references to the "toggle switch" that it is an early version with the standard keyless panel. Not a late version with the EVC panel
 
thank you Vics for your response.. Yes the glow plugs are energised when the light comes on. Not aware of an electronic module although there,s a 3rd relay shown but dont know where it is. I have changed over the Bosh relays and replaced the toggle sw. am trying to figure if a diode had failed somewhere and providing a back feed to the glow plugs. My temp. solution over the holiday week is to start the engine and then disconnect the feed to glow plugs. (Already had fingers burned
doing the latter .) Will update the forum if I get a solution.
 
jackho said:
thank you Vics for your response.. Yes the glow plugs are energised when the light comes on. Not aware of an electronic module although there,s a 3rd relay shown but dont know where it is. I have changed over the Bosh relays and replaced the toggle sw. am trying to figure if a diode had failed somewhere and providing a back feed to the glow plugs. My temp. solution over the holiday week is to start the engine and then disconnect the feed to glow plugs. (Already had fingers burned
doing the latter .) Will update the forum if I get a solution.
Click to expand...

The "electronic module" I refer to is the unit in the panel which incorporates the waning lights. described as "electronic unit (alarm)"

You refer to a 3rd relay, The diagrams I am looking at only show two relays. the "start relay" and the "glowplug relay". What is this 3rd relay and where are you seeing it?

The diode shown in the panel wiring diagram energises the glowplug relay during cranking.
 
apologies i can't upload the manual to this forum but, Typed word for word from the manual...


"Inside the MDI there are two not replaceable relays.
One relay is used to activate the preheat function.
The other relay is used to activate the starter solenoid
at the starter motor.
The preheat function will be activated when the start/
preheat button is pushed if the coolant temperature is
below 50°C. The MDI preheat output will change its
potential from 0 volt to nearly battery voltage across
the glowing plugs when the preheat function is activated.
When the start/preheat button is activated the MDI
start relay output will change its potential from 0 volt
to battery voltage to activate the starter solenoid at
the starter motor ."

Fault conditions 2
The preheat symbol is visible in the tachometer
and/or the display with a pre heat activated constantly

Possible reason
• The coolant temperature is below 50°C and therefore
prehating is activated.
• Closed circuit between the MDI preheating output
and the glowing plugs.
• Faulty preheat relay inside the MDI unit. (not replaceable)
Suitable action
1. Check the wiring and connections between the
MDI and the glowing plugs via the conductor rail.
2. Try with another MDI unit.


^^ littered with grammar and spelling apologies

& MDI is this

unite_electronique.jpg
 
Last edited:
Cactus Sailing said:
apologies i can't upload the manual to this forum but, Typed word for word from the manual...


"Inside the MDI there are two not replaceable relays.
One relay is used to activate the preheat function.
The other relay is used to activate the starter solenoid
at the starter motor.
Click to expand...

But does the fact that the OP has said that he has already replaced the relays ( and the toggle switch) not suggest that he does not have an engine version with the MDI system ?
 
Just back after a couple of weeks sailing. Sorry confused the wiring - just 2 relays. Can't find a pinout diagram showing the toggle sw wire colours and pin no's on switches to check i haven't mistakenly mixed then up - although everything works as normal - excepting the glow plugs become re energised!! after engine starts.

Should add my engine is the A version and not the MDI.
 
Last edited:
Yes thats the relay box on mine . Have replaced the 2 new Bosh relays with exact. Don't have pinout of toggle sws and wire colours incase I have mistakenly mixed something up. Thank you for your help so far.
Jackho
 
jackho said:
Further to my original post re: Glow plugs remaining on after start up - having changed the glow plug relay and toggle sw the problem still remains.
The startup cycle is normal but when the engine runs the glowplugs are re-energised hence the need to get a schematic or wiring diagram of the layout.
(or any other advice). The schematics in the workshop manual are not very coordinated so some more info would help.
In the meantime I disconnect the wire onto the glowplug rail after starting engine.
The engine is D1 30 with keyless control panel.
thank you in anticipation. Jackho
Click to expand...
 
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