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Need to test ECM wiring harness to find a possible break

Tiny
DAVID MERICA
  • MEMBER
  • 1999 NISSAN SENTRA
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
I went to pull out the ECM to check for codes by turning the screw on the back side. Well when I was trying to get to that screw I must have pulled too much on the harness and broke a wire or pulled a wire out of the connector, because the car started before I did that and now it does not start. It will crank but not turn over. Any suggestions? Thanks.
Also, would you happen to have a wiring schematic of the ECM harness?
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Thursday, January 11th, 2018 AT 9:20 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hello,

Make sure the screw/switch is turned all the way to the right which can cause the engine not to start sometimes.

Here is the engine wiring diagrams so you can do some testing.

This guide should help you as well.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below).

Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Friday, January 12th, 2018 AT 2:01 PM

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