I have a 98 Nissan Maxima Se that recently generated P0115 code. It also has been randomly stalling. I changed the ECTS but still get code and random stalling. I took to an independent auto mechanic and they said the ECTS wire to the PCM has a short in it but they could not fix it because the wire coming from the ECTS is yellow and they could not find a yellow wire anywhere at the PCM. They did not want to take the entire harness apart so they didn't do anything. They suggested a Nissan dealer would have the proper wire diagram to tell which wire is correct at the PCM. I haven't gone to Nissan dealer yet for fear of big bill. Anyone have a suggestion on how to fix/find this short.

 

I suggest you find a new mechanic. LOL

Download and use the appropriate Factory Service Manual (FSM) for the wiring diagram of the ECU using the link below. Then test for continuity.

http://boredmder.com/FSMs/Nissan/Maxima/

 

Thanks for the FSM's. The mechanic indicated he thought their was a short in the wire from ECTS to ECM but could not identify it. According to the FSMs it appears to be a yellow wire entering the ECM at pin #59. How do I replace this wire ?does it involve taking apart the harness ? Do I need to bring to nissan dealer and if so, what could I expect for costs. ? Thanks again for your help.

 

I would not take apart the harness. I would simply cut the wire about 4" from the ECU harness plug, and simply run a new wire into the engine bay and connect it directly to the ECTS. But before you do anything, test for continuity; your mechanic could have misdiagnosed the problem.

Any good mechanic can do this, no need for Nissan Dealer. Expect a minimum of 2 hours labor. It's a simple job, just tedious.