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About Sean Halliday
Expertise
general auto repair,japanese,bmw,mercedes,mini cooper 1960/2009,general british cars,ford.I DO NOT work on automatic transmissions.Manual transissions i install clutches only.Many people ask me to diagnose noises from their cars,unfortunately i cannot do this unless i hear it.As you appreciate,vehicles can and will make a variety of noises.I DONT UPGRADE or fit aftermarket performace kits,parts,chips,only replacement parts.

Experience
40 years experience on all general auto repair.

 
   

You are here:  Experts > Industry > Transportation and Logistics > Automotive > 87 Nissan Sentra, open loop ecm.

Automotive - 87 Nissan Sentra, open loop ecm.


Expert: Sean Halliday - 10/5/2009

Question
Just swapped E16I engine with same engine and year, but had 3 wire O2 sensor. ECM Mode 1 shows no led, green or red. Mode 2 shows no rich/lean activity. O2 sensor is heated 3 wire, although chassis is wired for 1 wire sensor. Hooked wiring harness connection to center wire of 3 wire sensor, eliminating the heater. Removed battery for 25 hours to try to reset ECM, but still open looped. Can I force it to closed loop?

Answer
The o2 senors would not be different as they are on the exhaust.They were on your original exhaust so you have put the engine in with the wrong wiring.The engine you got has the wrong loom and thats why it will not work with your sensors.Why didnt you swop your old loom from the old engine?This will solve your problem.It will work if you have the proper engine.

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