nismo4x4
Member
would a faulty sensor/earth cause the speedo/tripmeter to climb and make beeping noise u reckon?? thanks heaps for ur input mate
ABS light on?
- Thread starter nismo4x4
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would a faulty sensor/earth cause the speedo/tripmeter to climb and make beeping noise u reckon?? thanks heaps for ur input mate
Leprechaun
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I had a faulty earth from the battery to chassis that caused my reverse lights to flash with the ignition turned off, the door remote stopped working, still started and drove fine!, So yes I believe that could happen.
Aido
Member
Because I'm a curious person ( read that how you like!) I would head for a gravel road and tromp the pedal to see if the ABS still functions. If not which wheel/s lock? Could give your tech some info - computers are only as good as the info they are fed and perhaps the ECU says RH when it might be the LH. Might be completely unrelated to the ABS altogether - dont the OBD pins share input data from other areas?
Wont solve your problem but I'd do it just for interest sake and amusement before going back to Nissan.
Wont solve your problem but I'd do it just for interest sake and amusement before going back to Nissan.
nismo4x4
Member
hey buddy...yea i did that several times, drove bout 60km on gravel then slammed the brakes..pretty fun.... and felt as tho the abs worked as there was not much skidding...1st skid the abs light went off and thought u beauty musta been "clogged" some sort...then did it again and abs back on *sighs*
thansk for ur input
Thanks for your message, nismo. I wasn't paying a lot of attention to the thread as it's about a D40 and I don't know much about PlayStations on wheels
. I've read the thread, and my thoughts mirror those of 08KINGCAB and Old.Tony. I'd be firstly repairing or having repaired the gash in the cable (ensure that strands of the cable aren't broken, an increase in resistance MIGHT mess with the reading received by the ECU though I'd have thought it would be a pulsed signal rather than a resistance), then unplugging the cable from the ABS control unit, then I'd take the thing to a Nissan specialist (not dealer) and offer up my kidneys. Not much you can do to an ECU in the backyard unfortunately.Sorry I can't be of more help. Does anyone else entertain the idea of a fault in the speedo pulse signal? If the FR, FL, RR, RL ABS sensor readings are compared to the speedo pulse to detect wheelspin (TCS) or lockup (ABS) but avoid false positives during tight cornering, the sensor fault detection system might be programmed to throw a fault for the ABS sensor rather than faulting the speedo sensor based on expected reliability of each component. A stab in the dark at best. Need ABS/TCS flowchart to be sure and the manual that's in isn't available to us mere mortals.
Good thinking, the speedo pulse is an electronic signal sent by a rotation sensor attached to the rear of the gearbox itself on the primary output shaft. You might want to check that connection too.
The pulsed signal will be affected by resistance - more resistance = less signal received by the ECU, which could be interpreted as a fault.
It's curious though that the ABS still works. Makes me wonder if the whole thing isn't simply a display malfunction - like, the ABS and ECU are in perfect condition but the dash has a crossed wire.
That would also mean no error codes showing up in a Scangauge or Consult inspection too, because it's all doing exactly what it's supposed to.
Have you had any impact on the dash, or fluids in there, or pulled the radio out? What about a faulty earth on the dash (which is earthed through the radio)?
Come to think of it ... try this: turn off the radio. Now, do you have any problems?
The pulsed signal will be affected by resistance - more resistance = less signal received by the ECU, which could be interpreted as a fault.
It's curious though that the ABS still works. Makes me wonder if the whole thing isn't simply a display malfunction - like, the ABS and ECU are in perfect condition but the dash has a crossed wire.
That would also mean no error codes showing up in a Scangauge or Consult inspection too, because it's all doing exactly what it's supposed to.
Have you had any impact on the dash, or fluids in there, or pulled the radio out? What about a faulty earth on the dash (which is earthed through the radio)?
Come to think of it ... try this: turn off the radio. Now, do you have any problems?
How many brake circuits does the D40 have and what is their layout? You may only need one functioning rear ABS sensor to give you sufficient brake pressure moderation on a constant surface. Try dropping the right wheels onto the gravel shoulder of a (deserted!) tarmac road with no trees and doing another few panic stops from 40-50km/h. See if the right rear locks up.
On turning off the radio - sometimes I think modern cars are designed with the same logic as MS Windows
How many brake circuits does the D40 have and what is their layout? You may only need one functioning rear ABS sensor to give you sufficient brake pressure moderation on a constant surface. Try dropping the right wheels onto the gravel shoulder of a (deserted!) tarmac road with no trees and doing another few panic stops from 40-50km/h. See if the right rear locks up.
On turning off the radio - sometimes I think modern cars are designed with the same logic as MS Windows
Looks like there is an individual circuit for each wheel, plus one for the CAN (Car Area Network) and one for "Data link connector for CONSULT-II". Page 5/42 of BRC.PDF (Brake Control System).
The manual's diagnostics section actually suggests "shaking" the wiring:
If you can sit someone in the car to watch the lights while you're underneath giving it a good hippyhippyshake then it might help and doesn't cost a lot to find out.
As for Windows ... heh no argument!
Sorry should have been more specific and used correct terminology - I meant hydraulic circuits?
I've been reading, so I can answer my own question - anything other than two circuits would be unusual and I'm assuming it has one or two pressure regulators for the ABS and not four so the test will be valid I hope - anyway, I'm wandering off topic slightly. 
There's a primary side and a secondary side off the master cylinder. The primary feeds two separate circuits for the front wheels (one circuit each) and the secondary feeds a single circuit for the two rear wheels.
nismo4x4
Member
will try shaking the cables in the morning thanks... aswell as unplugging the abs cable closest to the abs unit.
I checked the speedo things while the head unit was off and still did it however i might actually unplug it from the back of the unit itself just to make sure...as i have installed an after market head deck about month ago..
also u guys r hurting my head with all this tech talk... lol...i feel like homer at a university lecture...0_0
thanks heaps guys for ur indepth input..i really do.
I checked the speedo things while the head unit was off and still did it however i might actually unplug it from the back of the unit itself just to make sure...as i have installed an after market head deck about month ago..
also u guys r hurting my head with all this tech talk... lol...i feel like homer at a university lecture...0_0
thanks heaps guys for ur indepth input..i really do.
Did this ABS light problem start shortly after the new head unit was installed?
I'd definitely check the earthing of the head unit. Make sure the earth from the dash is properly hooked up.
I'd definitely check the earthing of the head unit. Make sure the earth from the dash is properly hooked up.
nismo4x4
Member
ABS started bout 4 days ago..
i removed the headunit loom altogether and ABS was still on
this morning i tried shaking the abs cables and all cable nears the gearbox.....the speedo trip meter did not move at all
i then removed the ABS fuse (10amp) and couldnt replicate the issue but then i couldnt replicate the issue either with the fuse plugged in and flicked the inginition on many many times...
now the car is as per normal and still could not replicate the speedo/tripmeter...however ABS has been on all this time..
its almost impossible to fix an intimittant fault...
i may need to get the car booked in..
thanks heaps guys again for ur help...
Aido
Member
Be interesting to see if it redevelops. Bad contact on the fuse or holder perhaps?
Why let the bloke with scan tool guess when we can do it for free!
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nismo4x4
Member
yea the issue is back...im really thinking to take it to a auto sparky rather than a mechanic...mainly cause of the speedo/tripmeter acting weird...its actually causing my odometer to climb couple of km's even though the cars isnt moving.....ripped!!
Did you check the connection at the rear of the gearbox (that's the speedo sender right there, and as Pro Nav pointed out, it'll be connected (via logic in the ECU) to the ABS.
Aido
Member
Not sure your average auto elec would be able to diagnose this unless they have seen it before. Would still be best to remain in contact with your Nissan dealer. Alot of internal memos go around and it would be good to bring it to the attention of the service manager if you can document your last visit and everything you have tried in between.
As good and well intended as the advice you are getting here is it is still no substitute for internal knowledge. Pretty sure that your handbook would recommend that should the ABS light be displayed you should return it to an authorised Nissan repairer and since you have already done that and the problem still persists then the onus is on them to do the fault finding for you and rectify the sittuation.
As good and well intended as the advice you are getting here is it is still no substitute for internal knowledge. Pretty sure that your handbook would recommend that should the ABS light be displayed you should return it to an authorised Nissan repairer and since you have already done that and the problem still persists then the onus is on them to do the fault finding for you and rectify the sittuation.
nismo4x4
Member
well i think i did...i found 1 cable around the gearbox area double checked the cables surroundings..bit of dirt here n there...there was a plug i tried to unplug and giv it a clean but was stuck like all hell. ;-(
I think we've pretty much exhausted our textual diagnosis here - Aido's right, it needs someone with experience to put their hands on it.
