Hilux limp mode issue
Submitted: Tuesday, Nov 07, 2017 at 17:03
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Shepbar
Hi folks, hope someone can help with my problem.
My 2006 D4D lux slips into limp mode under light throttle on a rough track or corrugations.
Had a similar problem 40K or so ago when it tripped out under load but had a diesel mechanic clean the gummed-up EGR valve and inlet manifold and plug an inlet vacuum leak.
I find it hard to believe things have gummed up again so soon and I've had no issues when under load.
Currently in Esperence and will be in
Perth in a week or two and look for a diesel mechanic with a diagnostic tool to
check the system's memory.......any suggestions?
Shep
Reply By: Dean K3 - Wednesday, Nov 08, 2017 at 14:39
Wednesday, Nov 08, 2017 at 14:39
throttle position sensor be my top suggestion
sounds like a intermittent issue, so unless a diagnostic tool was fitted and managed to capture the error code when it occurred it maybe hard to diagnosis properly
i doubt its a
mine spec witha sneaky speed limiter fitted, drove one with max of 60kmph that was damn difficult in peak hour traffic
I could never fault city toyota, but have heard a few issues with other dealerships around the place.
Suggest TLC down O'connor -however they usually have a waiting period before servicing spot is available.
AnswerID:
614850
Reply By: pop2jocem - Wednesday, Nov 08, 2017 at 15:06
Wednesday, Nov 08, 2017 at 15:06
If I am understanding some of the replies I find it hard to see how with the advances in the engine/transmission management systems fitted to more recent versions don't include current and historic storage of fault codes.
I finished working with this technology 6 or so years ago and with what I would consider more rudimentry versions, and they kept historic faults stored until they were either fixed and cleared or self "repaired". Intermittent if you like.
Also where would someone like the OP get his hands on exactly what code Pxxxx means without the software available to dealerships?
Does the Scangauge have this info for whatever vehicle it is plugged into?
Cheers
Pop
AnswerID:
614853
Follow Up By: RMD - Wednesday, Nov 08, 2017 at 15:24
Wednesday, Nov 08, 2017 at 15:24
Pop
If you have a list of the codes, it will point to a fault in that system.
The Scangauge or similar only displays the info stored in the ECU memory.
All good if the fault is a component or sensor, but if it is an itermittent connection type fault the ECU may not record anything as wrong or more importantly it may indicate many sensors are at fault.
My local Nissan dealer had a Navara which indicated multiple sensor faults all at the same time, in a near new vehicle which stopped and would not start. After fiddling with wiring and negative earthing points it was then perfectly OK and indicated NO Faults present after they were initially cleared.
The unfortunate thing is, the owner then wanted to trade it in for another vehicle and was told the dealership wouldn't trade it because it had faults. The faults never happened again. He bought a different brand of vehicle, disgusted with that previous brand.
FollowupID:
885553
Follow Up By: Dean K3 - Wednesday, Nov 08, 2017 at 19:47
Wednesday, Nov 08, 2017 at 19:47
I purchased a portable OB2 reader kingchrome from memory.
Bit hard to remove a ahrd wired unit to assess code fault on another vehicle
in the booklet of "how to use it" is a comprehensive list of commonly used codes
starts at: P0001 fuel volume regulator control circuit open
ends at P0999 shift solenoid F control circuit High
and a plethora of others in between -hard part what happens if manufacturers use more than 999 errors in the future
FollowupID:
885560
Follow Up By: pop2jocem - Wednesday, Nov 08, 2017 at 20:25
Wednesday, Nov 08, 2017 at 20:25
RMD,
If my memory serves me, each sensor and it's associated wiring, plugs and connection points worked on a supply voltage commonly around 5v + -. There was then an operating "window" to supply the ECU information that it considered along with other inputs and compared to it's "mapping" for want of a better description.
Any reading above or below it's set parameters resulted in a fault code being generated. This code was then stored for later retrieval by some form of hard/software such as a Scangauge. To interpret the code or codes you obviously needed a list which translated into language the technician could work with.
The software we were provided as a dealer for the particular piece of equipment we were dealing with, American in origin in our case, came with the interpretation of the various fault codes and a possible "follow the bouncing ball" series of suggestions to find and correct.
All good if you had the interpretation of the various codes. Pretty meaningless for the average bear if you didn't.
I am not familiar with the Scangauges and what info they may provide other than a list of Pxxxx numbers.
Do they give interpretations such as "throttle position sensor voltage high/low" ??
Cheers
Pop
FollowupID:
885561
Follow Up By: RMD - Wednesday, Nov 08, 2017 at 21:11
Wednesday, Nov 08, 2017 at 21:11
Pop
I think all you get is the P code number, the rest you work out by having other info.
When my boost chamber hose fell off, it only gave a code of low boost, I had to find why.
FollowupID:
885563
Follow Up By: pop2jocem - Wednesday, Nov 08, 2017 at 21:53
Wednesday, Nov 08, 2017 at 21:53
RMD,
I guess in your situation you knew, or were able to ascertain, that the code number thrown up by the vehicle in question indicated a low boost situation. My point being that without that knowledge, it's just a number.
We were also given the resistance values across the pins of each sensor and the values at the ECU so that we could isolate a sensor fault or a wiring harness fault.
To carry out these
test all that was needed was a multi meter.
One of the first items we were always instructed to
test for was that the vehicle had a fully charged battery and supply voltage to the ECU before starting any diagnostic procedures.
It's amazing how many so called techs I came across who failed to
check that very basic first step.
Cheers
Pop
FollowupID:
885564