5

I have a 97 Mazda - 323 S V (BA) - 1.8 i 16V (114 Hp) with a manual 5 speed transmission. While trying to change the oil, I noticed the following connector, with one missing wire on what I think is the transaxel housing:

enter image description here

There is a similar connector on the front driver's side of the transaxel housing ( if that's what it is ). The little red circle is the broken wire, the large yellow circle the "senosr" or whatever it is.

This wire looks like it's been broken a long time, and there's no MIL and last time I connected to the ECU there weren't any error codes present.

I've been looking through the service manual for a similar model ( the 96 Protege ) and so far I haven't been able to find anything. The service manual can be downloaded here.

The section for the transaxel starts on page 394.

EDIT

Here's a similar looking "sensor" on the front side of the transaxel, next to the driver's side front wheel:

enter image description here

  • Do you reverse/ back up lights work? – mikes Mar 8 '15 at 21:33
  • It looks as though it would be a speed sensor, but I cannot find anything which looks like it. I suspect it cannot be your speedometer, as that is probably still working :D – Pᴀᴜʟsᴛᴇʀ2 Mar 8 '15 at 22:35
  • @mikes I was thinking that also, but they work, the car just passed inspection a few weeks ago. Other than kinda crappy gas mileage ( 19.7 mpg city ) and some idle issues everything seems to be working. – Robert S. Barnes Mar 9 '15 at 4:44
  • @Paulster2 I added another pic which might help in identification. – Robert S. Barnes Mar 9 '15 at 13:49
2

Since you said the reverse lights are still working, it's not the reverse switch.

This switch signals to the engine computer if you are in a gear or neutral. The computer uses this switch to determine several things, including how to handle engine deceleration during shifting and the idle feedback loop. With 1 wire broken, the computer only ever sees this switch in one state (open), which can cause idle issues (especially approaching a stop). Depending on how the computer handles this it may be using more fuel than it normally would, lowering your MPG.

I had this same issue on a 93 Nissan Sentra. The car would sometimes idle about 300rpm higher than normal and ran rich (too much fuel). Different manufacturer, but same concept.

  • Dude, if fixing this solves my bizarro idle problems, I will give you a medal! – Robert S. Barnes Jun 4 '15 at 17:45
  • One thing I noticed that I always thought was freaky was that allot of times it smokes when I put it in reverse. – Robert S. Barnes Jun 4 '15 at 17:51
  • I wonder if I could just splice the wire to fix it instead of paying to have a new sensor put in. – Robert S. Barnes Jun 4 '15 at 17:52
  • Well my car was just stolen so I guess I'll never find out if your answer is correct or not – Robert S. Barnes Jun 5 '15 at 9:40

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.