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So my car died on the road the other day cruising speed no ”fun driving” at all. Cranks just as usual. No spark and nu fuel. So i try with a jump on the dme. No cigar, fuel pump runs but car wont start.
I noticed i have no spark. So i check the coil in every way possible, tried another coil. Tried my good spare dme control unit. Nothing happens.
i decide to test all the fuses in the fuse box. Number 7 is burned out (DME control unit). So i think to myself, what could cause that? I try a new fuse just in case, the. Ofc the new one blows as soon as i turn on the igniton.
does any one have a clue as to where i should start?
My understanding is that the DME (ECU) isn't fused; indeed the unit itself acts like a fuse of sorts ie. if the grounds were to be disconnected, it could blow the DME (ECU).
Are you certain the fuse in question is for the DME (ECU)?
Sounds like a power wire is shorting to ground. I recommend taking out your power control box (fuse block) and cleaning it up, while you in there check your wires. You may find the problem right away.
I am not sure at all. Are you guys sure?On my fuse list, wich is in German (and not easy to understand), Fuse number 7 is indeed for the turbo water pump. But it sure can be understood as if the fuse protects both water pump and DME. I found and english version online. Car is a 1989 Porsche 944 turbo.
I Believe as a German speaking Person that the "(4 Vent)" Is the German abbreviation for 4 Ventiler.. OR as we say in English "4 Valves" So as I would understand it, "This is the DME circuit for a 16 valve" But if its a Turbo, it is used for the Electric water pump.
I Believe as a German speaking Person that the "(4 Vent)" Is the German abbreviation for 4 Ventiler.. OR as we say in English "4 Valves" So as I would understand it, "This is the DME circuit for a 16 valve" But if its a Turbo, it is used for the Electric water pump.
Great detective work! Would be interesting if the DME(ECU) was fused though
I have no turbo water pump. The turbo was to big so i opted to have it removed.
So, it is possible that the wiring for the turbo water pump is dangling in the engine compartment and shorting . . . . probably not causing your no start, but it should be looked into.
Nice find GPA951s on the Turbo vs 16V fuse chart differences. I recently had the same thing on a customer's E60 BMW M5. Every E60 wiring diagram I could find (including factory versions) showed the fuse I was looking at was for "gear indicator lighting," which is true for every E60 variant except for the M5. I finally found a diagram that referenced this fuse being used for the electronic damper control, which I was looking for. These things throw you curveballs sometimes!
Newki, What year car? The DME Circuit Runs through the Airbag as well if so Equipped.(Found out the hard way). Look up Vans Video on YouTube regarding Porsche schematics. This does sound like it will require some troubleshooting with a meter.
Newki, What year car? The DME Circuit Runs through the Airbag as well if so Equipped.(Found out the hard way). Look up Vans Video on YouTube regarding Porsche schematics. This does sound like it will require some troubleshooting with a meter.
So someone removed them? They were standard on 1989's and if so, they had to jumper out The harness behind the glovebox. If its not soldered and shrink-wrapped and they just jumped the pins then there is an intermittent connection there possibly.
So someone removed them? They were standard on 1989's and if so, they had to jumper out The harness behind the glovebox. If its not soldered and shrink-wrapped and they just jumped the pins then there is an intermittent connection there possibly.
06-17-2019, 03:02 PM
Keeps blowing DME fuse
