vwdt2008

1997 audi a4 1.8t auto...i have no power at the fuel pump fuse and no power at fuse #29 engine timing fuse. i have spark though. could it be crankshaft position sensor? also where is the fuel pump relay located??

turbo510

First, keep in mind that you won't have power at the fuel pump fuse unless the engine is cranking or running.

The fuel pump relay should be #6, right-most relay of the group under the dash. Pull the bolster cover (4 screws to remove to it). One way to visually verify the relay is to remove its plastic cover, then plug back in and watch the contacts while you crank the engine. They should close, then open again when you quit trying to start. Also, since the fuel pump relay has continuous battery power on its terminal 30, you can use your finger to push the contact arm, while listening for the pump which should run. This verifies the battery-relay-fuse-pump motor circuit.

4Driver4

Codes?

vwdt2008

there is no power at fuse even during when the pump should be priming when the key is first turned on. no powera t fuel pump fuse during cranking. no codes either...

vwdt2008

also what different models of audi or vw"s can i interchange the ecu?

vwdt2008

i got to the fuel pump relay today, i took the cover off the relay and pushed in the conector with my finger, the pump turned on and still no start. any ideas anyone????

turbo510

OK, so pushing the relay contacts together causes the pump to run, now will it do that by itself when cranking the engine? If the pump runs, and we'll assume it is pressurizing the fuel, next check for spark.

vwdt2008

no it wont do it by itself, i have to manually press it together, yes i have spark, my next is to get a noide light to see if there is power at the injectors if not then im probably looking at a new camshaft position sensor. to my knowledge camshaft position controls injector timing and operation and the crankshaft position sensor controls spark timing.