wanted E300D wiring diagram 1990

[premmington]

Has any body got a reliable wiring diagram for a E300D 1990 saloon with ABS, non turbo, 4speed auto, non air-con, RHD.

I,am having intermmittant problems with tacho and ABS warning lights.

Gut feeling is I have a short between wires behind dash. Intend to have it all apart this coming w'end. Assume, tacho driven from alternator?

Would be really gratefull for diagram...

p@remmington.plus.com

 

[television]

Has any body got a reliable wiring diagram for a E300D 1990 saloon with ABS, non turbo, 4speed auto, non air-con, RHD.

I,am having intermmittant problems with tacho and ABS warning lights.

Gut feeling is I have a short between wires behind dash. Intend to have it all apart this coming w'end. Assume, tacho driven from alternator?

Would be really gratefull for diagram...

p@remmington.plus.com

The OVP relay is the first to check, Pin 30 12volt in and pins 87 the output should have 12volt,its the one with the fuse on top. these go badly dry jointed and need soldering up or replacing.

1990 is a change of electrics year so cant answer exact. the tacho can take the signal from the fuel pump relay or the Main ECU dependent on the year.

the alternator has nothing to do with this, and I do not think that you will find shorted wires.

there have been issues with the Hall effect switch in the cluster that effects the tacho and the cruise control.


malcolm

 

[premmington]

its a six cylinder diesel with bosch PE pump, vacuum control idle speed. I thought only later models with air-con & electronic idle speed correction, had an ECU.

I know the petrol models, phase up the tacho from relay, but can't really see where else except the alternator a diesel would get signal from?

day on the end of a multimeter/occiloscope at the w'end will reveal all...

 

[television]

its a six cylinder diesel with bosch PE pump, vacuum control idle speed. I thought only later models with air-con & electronic idle speed correction, had an ECU.

I know the petrol models, phase up the tacho from relay, but can't really see where else except the alternator a diesel would get signal from?

day on the end of a multimeter/occiloscope at the w'end will reveal all...

The alternator has nothing to do with the Thacho. the alternator is an AC genarator with a control unit on the back

the speed sensor is shown here

http://www.detali.ru/cat/oem_mb2.as...GA=722.357&CT=M&cat=503&SID=15&SGR=105&SGN=03


malcolm

 

[premmington]

many thanks, can see flywheel sensor from your diagram.

have a look at my website...

http://www.remmington.plus.com

 

[premmington]

well I had a go!

Abs light was wired to charging circuit warning light (to fool MOT tester) have traced fault back to relay under cover on ABS pump, it throws light on under 10V, did normal clean sensors, both front hubs, rear diff, scope wave form by back probing for function. Awaiting relay from Germany (cheapest option).

Intermittant rev counter fault (also found cruise control cutting in and out) have traced back fault to cruise control amplifiyer box. W124 603 engine without aircon or electronic idle contol or anti surge, has no EDC box. Just huge great big Bosch PE pump with lift pump under it lubricated with engine oil. There is a crank sensor on starter ring gear which gives motion signal to cruise control amplifiyer box. Have sourced American Mitchall wiring diagram ex eBay (£6.50) diagrams, thou they not that good, seem to point at earth on cruise control actuator on side of engine block. Ran out of time this w'end. Not yet convinced of exact cause of fault.

Anybody else throw anylight to it............???? Please........!!!!!!

 

[television]

I have seen somewhere that there could be a problem with a Hall effect sensor in the cluster that can go intermitent this affects the tacho and cruise.

Will try and find.

Malcolm

 

[premmington]

I looked at that on wiring diagram, not sure if spare part avail' or I would have to butcher a secondhand set of clocks.

That would indeed cause amplifyer fault I'm getting, magnetic lux failure from hall effect (in fact internal coil failure in sensor) would stop voltage going back.

From cold, tacho works as coil gets some voltage thru it, heats up as you get going, causing resistance thus lower voltage back to amplifyer. Tacho fails when car is run for a few mins.

It all makes sense.

Wish I could get better wiring diagrams for cars, internal schematics for modules, I can normally find my way thru. Without them, its all tracing circuits, working out how things work. With good wiring diagram, ITS JUST LIKE READING A MAP...

Many thanks for your help television. You can see how I blindly suggested alternator for tacho phase output, when I looked a vacuum controlled diesel pump. I think too much............