1994 Bmw 540i Start Power Fuse 23 Fuel Pump Fuel Pump Relay Replaced Dme

1994 BMW 540I
67,000 MILES
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DCRAIG10004
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  • 2 POSTS
no start. no power to fuse 23(fuel pump). have power at fuel pump relay. replaced dme....no help.
Mar 17, 2013 at 11:26 AM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
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
Mar 17, 2013 at 12:57 PM
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DCRAIG10004
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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
Mar 20, 2013 at 11:50 AM
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