08 Nissan frontier 4 Cyl lack of power under acceleration
I need some help with this vehicle customer concern lack of power up hill or under heavy load with no check engine light on at any time , here is the code scan I do not have any dtc in power train module or bcm , except tpms and air bag, I checked readiness monitor are completed, record of last time check engine was clear 10,000 mi ago.
on my first road test I did not duplicated conditions 15 miles of driving , second test drive I took one of my body and he said what do you mean I am at the floor now and vehicles does not move from his own , there are captures from before when fault was not present the data package is in 3 pages , also there is when it fail lack of power present , the main differences in between are did not correlate app and tps ,when working good app and tps were 100% and tac control 85%, and max rpm archive 5,100, how ever when lack of power present app was 100% and tps 25% tac control 25% max rpm archive during that period 2,000 , if bump to neutral rev free to 5,000 rpm and tps goes over 50%.
now compare when lack of power at wot
any help will be appreciated tested for fuel control , fuel enrichment 02 sensor are reporting rich when wot , also lean during injector cut of on deceleration, fuel trims normal under all conditions during close loop operation , checked for exhaust back pressure found less than 1 psi, also removed the 02 sensor drive it no changes .
A couple of things that come to mind are traction control intervention or the pcm throttling down the engine in response to actual or misreported high engine temperature.
thanks For your input I will be collecting information to apply it i tbe next round of testing
Have you checked and adjusted tire pressures as tire pressure affects rotational speed of the wheel which in turn is monitored by the wss.If the abs module thinks a wheel is turning faster than the others it will think the wheel is slipping and ask the engine module to reduce torque .Since the engine revs normally when in neutral during the event it would seem the traction or…
makes sense , tire pressure is correct but tpms sensor are fault, I will monitor the abs data
Joel, Eric and Brian had some good answers. And good captures as well. The ecm certainly seems to know what it's doing and is able to control it so like Eric said the ecm is seeing something it doesn't like. The thing I always have to remind myself to check in these types of problems is knock sensor activity. I know you would have told us (and probably wouldn't have posted) if you had heard…
knock sensor on nissan has minimum to almost nothing of control , to the point they do not trigger the check engine light on they stay in pending at all time , I do smog in my area and 90% of nissan have the code in pending to the 04 year and under , the statae if caifornia say is ilegak to fail a nissan for pending code of knoc sensors, if we talk about subari yes they retatard the timing about…
Hello Joel take a close look at a bad clock spring I had a pathfinder last month that would loose power while driving I would be turning the steering wheel and the clock spring was shorted and it would effect the traction control through the steering angle sensor and the power would drop out I believe the only code I had was a open driver airbag code good luck
awesome information I have clock spring issues on it , dtc and horn inop at some points
I would monitor brake switch operation
Agreed on the brake switch operation. Recently had a Nissan Titan that would not accelerate over 2000 RPM and it ended being a bad tail/brake lamp bulb. The filaments were touching and anytime the headlights were on the ABS module and the TCM thought the brake were being applied.
Thanks for your input . Here I am reporting the findings , thanks to every one that gave your advise special thank to Jordan, the problem was the filaments of tail light was damages making contact with the brake filament turning on unwanted that light , the sad part of this is no data any where is telling you the ecm was in reduce mode by command of any other ecu , I monitor the brake switch…
Whow!!!!!!!!. Great Tip. Sure will save it in my memory. Thank You for great info. Have a nice Day.
Disconnect abs module
Check charging system and battery condition.
May get mad or say things about this is it getting the right amount of fuel plugged filter , were are they getting gas water in fuel plugged injection
yes sir , is getting the rigth amount of fuel we graph there the 4 02 sensor yo can see they correlate all 4 agree wuth my accion of fuel enrichment or deccel, you can learn from thise I thong is in package 2 or 3 of scan data