463 dash fault
Hello, can anybody help, my dash has 3 faults rev counter, fuel gauge & temp gauge neither are working, rev counter had an intermittent fault now permanent, temp gauge no reading, new sender unit tried, still not working, fuse in OPR ok, also ABS light is on, cleaned up earths on D/S inner wing, i could do with some ideas please.
Does ABS light go off when you reset it ( turn on and off on switch) Or does it glow dimly when you switch ABS off? Have you checked the ABS overload relay , has its own fuse on relay?
Could it be one of the 'cluster' controller type thingys that tend to be at the back? I looked at a G500 for a member a few months back, and all the needles would not flop back to zero, and it turned out to be the cluster controller...
Spider1V
In a few days I will buy some time on the Mercedes Benz portal to buy some information to address your problem. I will come back to you after. I feel your ABS issue and rev counter is a separate one but the fuel gauge and temp. gauge could be a joint issue.
Who ever has your vehicle; it would be nice if they can read your chassis number to you and you let me know.
The dash on Joe's G uses CAN communications and has some modules incorporated.
Your 92 G is all analogue signals, there is no controller.
Thought that I had a circuit diag but I can't find it, sorry
Not sure.... but my monies are on the Over Load Protection Relay being duff....
Swop a used one or i think JasonGDS might have a new one he may part with cheap if you PM him...
Common on many 80's / 90's MB products
You need part number A201 540 37 45 as there are 2 or 3 types
Jason's was for a 1991 / 1992 300GD same as yours.... OM603
Gav
He did refit the engine earth strap after having the motor out....?
Back left from motor to chassis i think....
Gav
Rev Counter / Tachometer Sensor runs in the bottom left of the Engine Sump, pick up of the Flywheel
Is this back in, clean, straight and with the Proper O Ring Seal and not 2? Measuring distance is crucial...
It has a short lead on it connected to the loom, is this sat in the connection correctly / cleanly
Are you checking / changing the correct Temp Sender as there are 2 in the Cylinder Head?
Front one is A006 542 34 17 and reads Temp but is Idle Control and Fueling (below no1 inlet)
From memory a single pole Sender
Rear one is A008 542 56 17 and reads Temp for the Temp Gauge and Glow Plug shut off (below no2 inlet)
From memory a twin pole Sender
Gav
Rev Counter / Tachometer Sensor runs in the bottom left of the Engine Sump, pick up of the Flywheel
Is this back in, clean, straight and with the Proper O Ring Seal and not 2? Measuring distance is crucial...
It has a short lead on it connected to the loom, is this sat in the connection correctly / cleanly
Part number A008 542 17 17 or A010 542 22 17
Have you tried running a separate wire from the Temp Sender or Fuel Gauge to Earth and seeing if either Gauge sweeps across?
Fuel Sender in the Tank has a very fine wire inside that are prone to breaking...and will cause a zero reading..
A009 542 17 17 is the Sender and big bucks
It can be carefully stripped and repaired / replaced as required for pence...
Access through a square cover in the rear floor after removing 4 small screws...
I have one in my garage awaiting the repair as a spare....
Gav
Hi David
Yes, i think so...
I assume the A202 540 38 45 was a typo and should have been A201 540 38 45
If that's the case then yes A201 540 37 45 is a straight replacement
I assume the fuse is OK....
£44.00 + VAT Retail
City West @ Taunton TA1 2EJ have stock as of today
Tel 01823 447555
Hope that helps
Gav
So apart from ABS light, does everything now work as it should, rev counter etc?
Hi David
Did you replace the fuse and the same happened?
Is the Battery in tip top condition?
In the Fuse / Relay board you should have 7 identical standard Relays...
3 Diff Locks
2 ABS
1 Heated Rear Window
1 Electric Windows
The Lid Table or Handbook should tell you which is which...
Try swapping the ABS 2 with the Windows and HRW and see what happens...one at a time...
Does the inside Bulkhead above the ABS Control Unit look wet / rusty? The ABS ECU is mounted on the left inner Bulkhead behind the Fuse / Relay area, ECU should be A008 545 44 32, this area is prone to water ingress either from a leaking Windscreen, Wiper Spindles or Battery Tray or worse Bulkhead or Battery Tray rot...
You can check the ABS Dash Switch is not faulty also by swapping with either the Rear Interior Lamp, Heated Rear Window or Recirculation Vent Flap Switches which are all the same number Switch (just different Symbols inserted)
As well as the internal Wiring Loom EARTH connections there can be up to 10 EARTH Straps in and around the Engine Bay area!!!!! and don't overlook the Battery -ve to EARTH Lead condition and the Lead itself, which can rust inside, also the +ve Lead and Starter Motor connections for the same things...
EARTH LEADS...
Engine to Left Chassis Rail
Bonnet to Bulkhead x2
Radiator to Body
Front Cross Member to Body x2
Bonnet Catch to Body
Vent Case to Body
Steering Column to Body
ABS Unit to Body
There are also 2 small Relays inside the ABS Hydraulic Unit itself, under the Black Cover held on with a single Screw from memory...
Plenty to check...
Think the ABS issue will be the fault behind all issues now...
Hope that helps?!? Can't think or anything else for now...
Gav
Have you checked with a Multimeter what sort of Voltage you are getting across the battery?
I had ABS light glow on another car, when terminals just push fit on Battery,
I have a similar issue. think I have isolated it to the glow plug circuit.
If I disconnect both the low and high current connectors at the glow plug relay the fuse holds and the ABS light goes out and the rev counter starts working.
I've got no further than this. Maybe it's poor engine to chassis earth?I'll check that next.
I hate car electrics.
ABS switch changes nothing.