1994 BMW 540i Repair Question
Topics covered: Fuse, Fuel pump, Fuel pump relay.
Mileage: 67,000 miles.
Mileage: 67,000 miles.
Asked on March 17, 2013
BMW 540i Fuse Problem
No start. no power to fuse 23(fuel pump). have power at fuel pump relay. replaced dme....no help.
Asked by dcraig10004Answer
Replied on March 17, 2013
dme???? please explain
there should be 2 feeds to the relay. one is key on power and the other is 12 volts constant.
if there is no power to the fuse box fuse, then you may have a wiring issue at the fuse box or check fusible links
Roy
Replied on March 20, 2013
The DME(bmw lingo) is the ECM. It was a bad CPS. During troubleshooting I inadvertantly had the fuel pump relay and engine control relay swapped, so it still wouldnt start. swapped them back and she fired right up. thanks