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Thread: Gap IID tool and fault messages

  1. #1
    Join Date
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    Gap IID tool and fault messages

    Hello fellow Discovery drivers,
    I have finally made the decision to purchase the Gap IID tool BT version.
    It arrived and I have been able to complete a few simple tasks, like setting a new ride height, read error codes etc.
    I have two simple questions
    1. Is there anywhere where other Gap IID tool owners have document cool things that can done?
    2. Is there anywhere /anyone that can help with fault codes ? some are pretty obvious, like this "B1C79-14 (2E) Front washer pump relay output circuit - General electrical failure" , and yes my washer wiper pump is not working, but I have others like "U0122-87 (28) Lost communication with vehicle dynamics control module - Bus signal/message failure - missing a message( at 126276 km )" for which I have no idea where to start looking.



    Regards,
    Richard

  2. #2
    Join Date
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    Old Toongabbie, Sydney NSW
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    Quote Originally Posted by rdenyer View Post
    Hello fellow Discovery drivers,
    I have finally made the decision to purchase the Gap IID tool BT version.
    It arrived and I have been able to complete a few simple tasks, like setting a new ride height, read error codes etc.
    I have two simple questions
    1. Is there anywhere where other Gap IID tool owners have document cool things that can done?
    2. Is there anywhere /anyone that can help with fault codes ? some are pretty obvious, like this "B1C79-14 (2E) Front washer pump relay output circuit - General electrical failure" , and yes my washer wiper pump is not working, but I have others like "U0122-87 (28) Lost communication with vehicle dynamics control module - Bus signal/message failure - missing a message( at 126276 km )" for which I have no idea where to start looking.



    Regards,
    Richard
    I have a service manual that has diagnostic codes. Literally hundreds of them. Here's the detail for the second one. Usually, what most people do is clear the codes and see if they return. If they do, then look further. If not, then it's probably OK. Wiser heads may comment further.

    U0122-
    87

    Description

    Lost Communication
    With Vehicle
    Dynamics Control
    Module - Missing
    message


    Possible Causes

    Anti-lock brake
    system control
    module power or
    ground circuit open
    circuit, high
    resistance
    High speed CAN
    bus circuit short
    circuit to ground,
    short circuit to
    power, open circuit,
    high resistance
    Anti-lock brake
    system fault


    Action

    Refer to the electrical circuit diagrams and check
    the anti-lock brake system control module power
    and ground circuits for open circuit, high
    resistance
    Using the manufacturer approved diagnostic
    system, perform a CAN network integrity test.
    Refer to the electrical circuit diagrams and check
    the high speed CAN bus circuit for short circuit to
    ground, short circuit to power, open circuit, high
    resistance
    Using the manufacturer approved diagnostic
    system, check the anti-lock brake system control
    module for related DTCs and refer to the
    relevant DTC index


    HTH,
    Martin

  3. #3
    Join Date
    Dec 2009
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    Ranelagh, Tasmania
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    It is not unusual to get lost communication errors, just clear it and if it is recurring error you may have a problem. Obviously if the washer doesn't work and there is an error there is a problem.
    Fuji white RRS L494 AB

  4. #4
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    Perth
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    Gap IID tool and fault messages

    I always have a continual error regarding lost communication between the parking system and the audio system, yet the two still work fine together so I ignore it. It's not the sort of error that causes a check engine or any other light, so if it wasn't for the IID I'd be none the wiser.
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

  5. #5
    Join Date
    Oct 2016
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    Quote Originally Posted by DiscoJeffster View Post
    I always have a continual error regarding lost communication between the parking system and the audio system, yet the two still work fine together so I ignore it. It's not the sort of error that causes a check engine or any other light, so if it wasn't for the IID I'd be none the wiser.
    I get the same error - Suspect it is a feature of the 2010 3.0 TDV6 models... :P
    2010 TDV6 3.0L Discovery 4 SE, Alaska White, GME XRS-330c, IIDTool BT, Traxide D3-DU Dual Battery Kit, Apple CarPlay, Power and Heated Seat retrofit, Rhino Rack Batwing Awning (Part time install), BFG KO2 for play

  6. #6
    Join Date
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    My understanding from the LR trained UK mechanic who looked after my D3 is that in general you can ignore any 'U' codes in the first instance. They are often modules taking action and issuing a code in response to some other primary fault. For example, the engine may have a true fuel pump error and issue a 'P' code on the CANBUS, which will result in the engine the lowering power output and issuing 'U' code, and the transmission then limiting available gears and issuing a 'U' code, and the suspension then limiting height changes and issuing a 'U' code. The original 'P' code fault is where to start looking.

    But then I'm an engineer and not a mechanic

    Andrew

  7. #7
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    Angry LR3 B1C79-14 (28) B1C81-14 (2E) & Relay Output Circuit Faults

    Quote Originally Posted by rdenyer View Post
    ...some are pretty obvious, like this "B1C79-14 (2E) Front washer pump relay output circuit - General electrical failure" , and yes my washer wiper pump is not working.
    Obvious, so you say. I'm getting errors for both the front and rear circuits. This makes sense since a single pump is used for both the windshield and rear window. However, the fuse is never blown and 3 new pumps in a row have died within a couple of days to a couple of weeks. Did you ever resolve your fault? The error is for a relay, but I'm not sure where this relay is located. When I press the wiper button I can hear clicking in the middle of the dashboard, but I don't want to tear things apart until I know if there is a relay there. Does anyone have any ideas? This is the only place on the Internet I can even find mention of these faults!

  8. #8
    Join Date
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    St Helena,Melbourne
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    More than likely you have a wiring fault, see if you can trace the wiring and look for signs of chaffing or rodent action.
    MY08 TDV6 SE D3- permagrin ooh yeah
    2004 Jayco Freedom tin tent
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

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