2013 Nissan Sentra Limp Mode

Azael Diagnostician Texas Posted   Latest  
Discussion
Electrical
2013 Nissan Sentra Advance 1.8L
P1550
Limp Mode
Lack of Power

Good evening gentlemen. so I have this 2013 Nissan Sentra that is having an issue which the vehicle is stuck on limp mode when it sets engine code P1550. I did the flow chart and all rested well on the battery current sensor. good ground, good 5 volts, also good signal. as well I tested the battery. and it was bad 3yr old battery. replaced with no change. code normally pops after a couple of starts of the vehicle. seeing if anyone has dealt with such issue before. or if anyone knows any Nissan techs that could guide me. Thank you for yalls time 

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Maksim Diagnostician
California
Maksim Default
   

—Bad alternator / Aftermarket Alternator can do samething. Check AC voltage from Alternator. Also check for Overcharging / Undercharging—use DVOM with Min/Max function test drive with several restarts than check Min/Max Voltage—-you will see if its out range ( ive seen got to 15.00 volts while test drive randomly—it was bad Alternator)

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Bob Owner/Technician
Massachusetts
Bob Default
 

The PDF I uploaded is not for your specific engine but I think the description of the P1550 failure mode is helpful. It says the detecting conditions are "The following condition continues for 10 seconds or more with the ignition switch ON (1 trip detection logic): • Difference between the maximum and minimum current values of the battery current sensor is 1 A or less" I would put an amp…

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Tyler Technician
Kansas
Tyler Default
 

What is the battery current sensor signal on the scan tool doing KOEO and KOER at idle? I can supply some known good captures to compare to if needed. Nissan has a pretty nice rationality test for this sensor. It's under Component Inspection, with the P1550 diagnostics. Short version, you disconnect the negative cable, then use a jumper cable between the battery negative post and a body ground…

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Azael Diagnostician
Texas
Azael Default
 

Well this is pretty embarrassing. Just see if you see the difference. one picture is the car I’m working on the other is from another Nissan

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Victor Technician
California
Victor Default
 

Got it... wow. The AMPS issue...

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Tyler Technician
Kansas
Tyler Default
 

Hah! I didn't see that coming. It's only embarrassing for whoever installed the cable that way. Wonder when that problem got installed...

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Bob Owner/Technician
Massachusetts
Bob Default
 

Ok, we all skipped the most important first step. A good visual check. Glad you found it.

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Geoff Diagnostician
Hawaii
Geoff Default
 

Factory SI - $xx.00 Factory scan tool - $yyyy.00 Pico Scope - $zzzz.00 Having a similar vehicle to compare to.....PRICELESS.

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Azael Diagnostician
Texas
Azael Default
 

Yep. it’s just crazy because I’m used to seeing the honda current sensors. and first glance it looked good to me

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Geoff Diagnostician
Hawaii
Geoff Default
   

It's always a challenge out here because "broken" is often the first time I ever see any particular type of car. I had a Focus in for inop wipers. It was my first introduction to the battery sensor and the wiper motor MODULES all being on a LIN. The battery cables were home made, so there was no sensor, and the LIN wire for the sensor was tucked neatly underneath the battery where you'd never…

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