Webasto dosing pump
- Thread starter CrispyEdd
- Start date
Mark Adams
Member
The Audi Part Number for the Fuel Metering Pump is 4B0 963 303 (according to 7Zap)
Mark Adams
Member
Interesting variant featured here, that I've not seen before: Replacement for Eberspacher Diesel Pump
Most of these seem to be Chinese. However Webasto still use an almost identical pump to this day, so it may be worth contacting them directly to get a price for the part?
Most of these seem to be Chinese. However Webasto still use an almost identical pump to this day, so it may be worth contacting them directly to get a price for the part?
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PlasticMac
Admin Team
Does the supply to the pump, come from the controller circuit board you bought?
Mac.
CrispyEdd
Member
It has done, all components have been working at some point across all system configurations between the two complete webastos I have.
The control board in there now is pristine and was working before.
However I can't check if 12v is coming from the board yet as don't have -3 temps or vcds full.
On Monday I'm going to see chris Warren to test it.
I guess those feed wires come from the multiple off the unit? Maybe the connector isn't on right?
PlasticMac
Admin Team
Think about the sequence, of which the pump is one step. I suspect other steps will precede the pump starting, such as the glow plug up to temperature.
The controller will only run the pump, when the preceeding conditions are met.
Mac.
CrispyEdd
Member
The fans runs and it heats but I never hear pump then error glow plug short to ground. However I've just fit a brand new glowing and wiring and circuit board. So if there's a fault it must be the wiring pre webasto, but that's about 3 inches of wires in a loom with nothing touching it, so no way any damage to that surely.
Mystery for now, I'm hoping its blocked fuel feed pipe and glow pin short is red herring.
Either way this'll be last of my time it gets as it must be deep wiring issue which will be beyond me. Sadly
Mystery for now, I'm hoping its blocked fuel feed pipe and glow pin short is red herring.
Either way this'll be last of my time it gets as it must be deep wiring issue which will be beyond me. Sadly
PlasticMac
Admin Team
The glow plug error would, I think, mean the controller will not start the pump.The fans runs and it heats but I never hear pump then error glow plug short to ground. However I've just fit a brand new glowing and wiring and circuit board. So if there's a fault it must be the wiring pre webasto, but that's about 3 inches of wires in a loom with nothing touching it, so no way any damage to that surely.
Mystery for now, I'm hoping its blocked fuel feed pipe and glow pin short is red herring.
Either way this'll be last of my time it gets as it must be deep wiring issue which will be beyond me. Sadly
Short to ground means the plug itself is a short circuit, so the controller switches power to the glow plug off, to protect the glow plug power control, (probably the device under the metal heat sink).
If you put a meter across the glow plug, with nothing connected to it, what resistance do you see?
Mac.
CrispyEdd
Member
I bought a fully refurbed burn chamber gauze and new glow pin, tested off fleabay from a well established seller.
Howey
Member
Sweet have you got a link?
CrispyEdd
Member
Webasto Thermo Top C E Z TTC TTE TTZ BURNER Chamber with GLOWPLUG DIESEL 12v | eBay
Webasto ThermoTop C E Z DIESEL 12v. As new glowplug ( tested below 0.3ohm). Reconditioned, body sandblasted, combustion chamber pre-polished to avoid soot buildup, top ring often re-galvanized. Reconditioned Burner Insert.
www.ebay.co.uk
datsundrew
A2OC Donor
You really need to do a test on VCDS to see if the pump works, the interior light flickers slightly when the glow plug is heating, and the pump clicking is obvious without the engine running. Chris can hopefully do it for you.
Pin no 6 on the webasto plug is the feed out to the dosing pump, and the other terminal on the pump goes to earth via the loom somewhere.
Pin no 6 on the webasto plug is the feed out to the dosing pump, and the other terminal on the pump goes to earth via the loom somewhere.
PlasticMac
Admin Team
There is a possibility that the short circuit glow pin has damaged the controller. I'd think the controller would have over current protection, and the short circuit message likely.Thanks for help, its kind of what inexpecred. Sadly it's all back in the car and booted in place. Absolutely no way I taking it out for a fourth time
It's brand new and only been switched on once so the glow pin should be perfect.
Will see what happens Monday...
To check, you need to disconnect the glow pin, connect the glow pin wires to a multimeter, on DC Volts, then start the Webasto. If you see a voltage, then the controller is probably OK, and the glow pin may not be,
Mac.