1994 BMW 525i voltage problem

Tiny
3DARRYL1GREENE3
  • MEMBER
  • 1994 BMW 525I
  • 2.5L
  • 6 CYL
  • RWD
  • AUTOMATIC
  • 186,000 MILES
My ECU can't read my battery input, I have a new battery, my positive wire show no sign of corrosion is it possible that the wire is damaged internally? And my fuel pump turn slow but when I run straight power it runs normal and gas comes out but when it's hooked up regulator it tickle.
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Thursday, March 13th, 2014 AT 4:43 PM

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Tiny
KNOWLEDGE IS POWER
  • EXPERT
Start with your battery cables. Make sure the ground cable is tight and tight on both ends. If you can read the voltage at he ecm plug with a meter youll know if youre getting full battery power there or not. The ecm has a minimum voltage requirement. A loose ground or power cable can cause both no ecm and a slow fuel pump that runs fine when jumped to the battery
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Friday, March 14th, 2014 AT 4:09 AM

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