Engine wiring harness installation

Tiny
BRYCE CLINE
  • MEMBER
  • 2007 MAZDA 3
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
Someone removed the wiring harness and I am trying to find out where the connection for the one I have in picture below. It's the harness that comes around front of engine and ends at the o2 sensors. My only other thought is it's the harness that runs around the core support.
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Tuesday, May 19th, 2020 AT 2:52 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,055 POSTS
Hi,

If they end at the oxygen sensors, it either goes to the PCM or power. Can you tell me the wire colors?

I attached three pics below. I highlighted where the wires from the sensors ends up. Take a look through them and see if the wire colors match.

Let me know.
Joe
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Tuesday, May 19th, 2020 AT 8:30 PM
Tiny
BRYCE CLINE
  • MEMBER
  • 32 POSTS
Hi Joe,

Thank you for the schematic. I see what's going on now, the harness that runs below that one is older then 2007. I seen your diagram and what I have to change that lower harness and it has the correct plug that eliminates the one in question cause it plugs into it.
Thank you Joe, greatly appreciated.
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Wednesday, May 20th, 2020 AT 9:42 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,055 POSTS
Happy to help. Let us know if you have questions in the future.

Take care,
Joe
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Wednesday, May 20th, 2020 AT 7:56 PM

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