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Thread: ACE Faults 03-04 and 03-05

  1. #1
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    ACE Faults 03-04 and 03-05

    Hi all,

    Has any one had issues with 'ACE Pressure Control Valve Fault' (Nanocom fault 03-04) causing car to go into limp mode? My car has gone into limp mode with hazards being turned on automatically on 3 occasions now. Today there was an additional fault 'Pressure Signal Not Changing' (fault 03-05).

    Anyone know how to fix the Pressure Control Valve fault?

    Can ACE be disabled to prevent further incidences of car going into limp mode?

    A search on AULRO and the internet didn't provide much info on this issue aside that the block was serviceable.

    Mark

  2. #2
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    I would pluck the ACE fuse - you’ll find it in the engine fuse box .
    LROCV member #131
    1999 build D2 TD5 Auto, Mantec snorkel, 2" LRA spring lift, ARB on board air, Ashcroft ATB, CMM air ram CDL shifter, swag & gold pans ....

  3. #3
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    The ACE has nothing to do with limp mode whatsoever... especially not with flashing hazards, the flashing hazards corroborated with stalling can be due to the inertia fuel cut-off switch or it's circuit

    also as long as the ACE fault code was retrieved with nanocom you can't rely on it, though if you want to disable the ACE remove relay R14 then it will go to ''locked bars" and act like on conventional anti roll
    Discovery Td5 (2000), manual, tuned

  4. #4
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    Quote Originally Posted by sierrafery View Post
    The ACE has nothing to do with limp mode whatsoever... especially not with flashing hazards, the flashing hazards corroborated with stalling can be due to the inertia fuel cut-off switch or it's circuit

    also as long as the ACE fault code was retrieved with nanocom you can't rely on it, though if you want to disable the ACE remove relay R14 then it will go to ''locked bars" and act like on conventional anti roll
    I should clarify what I call limp mode; my engine light flashes intermittently, there is a loss of power, it stalls and then the hazards turn on and then the motor wont start.

    The only faults logged on Nanocom are the ACE faults listed, and once they are cleared the car is able to be strarted and the hazards turn off. If it is an issue with the inertia switch why would it be resolved by clearing ACE faults?

    Why can't you rely on Nanocom to retrieve faults?

    Any ideas how you can you test the inertia switch?

  5. #5
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    Nanocom has a problem with identifying the correct fault codes for ACE, should have been resolved with the updates but mine is on the latest and it still does it, i cross-checked with hawkeye which is 100% reliable.. it reads live data well so the ACE fault can be diagnosed with nanocom by bridging the ACE(R14) relay's contact and reading live inputs

    I cant think to anything else but that it's some coincidence between the ACE fault and that "limp mode" you described cos the ACE system has no effect on the engine's management whatsoever while a tripped inertia switch would bring on the hazards and cut the fuel pump even though this would not affect the ACE... the ACE expects engine speed input from the ECM so if that drops while driving(which happens in your case) it could consider it a fault and log a code

    to rule out the inertia switch you must unplug it and bridge the pins in the plug as the circuit to be closed there

    if it's not that it seems like a bad contact somewhere possibly at/in the engine bay fusebox cos that can affect the ACE and EMS too.

    you should check connector C0577 as it's very suspect cos the inertia switch circuit is from pin 3 and the ACE relay's coil from pin 9 which are close so a bad contact/corrosion there could affect both systems at the same time

    C0577.jpg
    Discovery Td5 (2000), manual, tuned

  6. #6
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    Thanks for the tips Sierrafery - found the problem was the inertia switch. The plastics on the switch had disintegrated, I guess from the corrosive gases coming from my aux battery that fried itself. Got a new switch from Roverlord and car going again.

  7. #7
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    Quote Originally Posted by sierrafery View Post
    Nanocom has a problem with identifying the correct fault codes for ACE, should have been resolved with the updates but mine is on the latest and it still does it, i cross-checked with hawkeye which is 100% reliable.. it reads live data well so the ACE fault can be diagnosed with nanocom by bridging the ACE(R14) relay's contact and reading live inputs

    I cant think to anything else but that it's some coincidence between the ACE fault and that "limp mode" you described cos the ACE system has no effect on the engine's management whatsoever while a tripped inertia switch would bring on the hazards and cut the fuel pump even though this would not affect the ACE... the ACE expects engine speed input from the ECM so if that drops while driving(which happens in your case) it could consider it a fault and log a code

    to rule out the inertia switch you must unplug it and bridge the pins in the plug as the circuit to be closed there

    if it's not that it seems like a bad contact somewhere possibly at/in the engine bay fusebox cos that can affect the ACE and EMS too.

    you should check connector C0577 as it's very suspect cos the inertia switch circuit is from pin 3 and the ACE relay's coil from pin 9 which are close so a bad contact/corrosion there could affect both systems at the same time

    C0577.jpg
    Well done sierrafery! Your expertise is impressive.
    Nick

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