Range Rover On Board Diagnostic Display
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Thread: Range Rover On Board Diagnostic Display

  1. #1
    SENIOR ROVER
    Join Date
    October 1st, 2006
    Location
    Mobile, AL USA
    Posts
    1,172

    Range Rover On Board Diagnostic Display

    Later model RRC came with a on board diagnostic reader for the check engine light. A rather simple but clever design allows us to figure out why the light is on but also displays multiple
    codes to make life a little easier. Under the right seat are to computer and a black box about 2"X3" the has a sticker that reads Range Rover On Board Diagnostic Display, it will display one code at a time in big easy to read red analog letters. Below are the pictures of the plugs and display, as well as instructions for resetting and reading multible codes. This should be made a sticky for future owners.


    Description of fault codes
    The fault codes are listed in order of priority. Where more than one fault exists, clearing the first fault code will permit the next code to be displayed.

    Note: Fault code 02 will show if the ECU has been reconnected. Switch on ignition to clear the display

    Clearing fault code display
    It is necessary to clear the code displayed when the fault has been rectified, and to access any fauther fault codes that may exist. Clear the fault code display using the following procedure:
    1. Switch on the ignition.
    2. Disconnect serial link mating plug, wait 5 seconds, reconnect.
    3. Switch off ignition. Wait for the main relay to drop out.
    4. Switch on ignition, the display should now reset, If no other faults exist the display will be blank.
    5. If mulitiple faults exist repeat steps 1-4 til each fault is cleared.

    Codes and their translations:
    Code 29: ECU memory check - If this fault is present all other faults are unrelible and must be ignored.

    Proceed as followed:
    1. leave battery connected
    2. Switch off ignition
    3. Wait 5 seconds
    4. Disconnect ECU plug
    5. Reconect ECU plug
    6. Switch on ignition and check diplay unit.

    Note: If fault code 29 is present again restart test sequence.

    Code 44 - Left oxygen sensor
    Code 45 - Right oxygen sensor

    Code 25 - Ignition Misfire - This code indicates that a misfire has been detected, code 40 or 50 will indicate which bank the misfire has occured.

    Code 40 - Misfire bank A - left bank
    Code 50 - Misfire bank B - right bank

    If both fault codes are present check the following components
    Distribitor cap
    Rotor arm
    Coil
    Electrical connectors
    Pick- up (air gap)
    Amplifier
    Injectors if codes 34 or 36 are displayed.

    If either code 40 or 50 is displayed check components applicable to the particilar bank that has had the misfire.
    Spark plugs HT leads
    Distributor cap
    Injectors if codes 34 or 36 are displayed.

    Code 12 - Mass airflow sensor

    Code 21 - Fuel tune selector - Identifies that the tune selector circuit is open.

    Code 34 - Injector Bank A - The display will indicate if the injectors are causing the engine to run rich or lean.

    Code 36 - Injector Bank B - The display will indicate if the injectors are causing the engine to run rich or lean.

    Code 14 - Coolant Thermistor

    Code 17 - Throttle Potentiometer

    Code 18 - Throttle potentiometer input high/airflow meter low

    Code 19 - Throttle potentiometer input low/airflow meter high

    Code 88 - Purge valve leak

    Code 28 - Air leak - Check for air leaks in the following areas.
    Hose, air flow meter to plenum
    Breather system hoses to plenum
    Brake servo hose
    Distribitor vacuum advance
    Hose, purge valve to plenum
    Injector seals

    Code 23 - Fuel Supply - Check fuel supplie pressure

    Code 48 - Stepper motor

    Code 68 - Road speed sensor

    Code 69 - gearswitch

    Group 58 - Group faults 23/28 - This indicates that a fault has been resistered that is caused by the fuel supply or an air leak but the exact fault cannot be identified. Check all items outlined under code 23 and 28.

    Code 15 - Fuel Thermistor

    The second plug, one one the floor, is the serial link matin plug as well and the ECU plug.


    This is the On Board Diagnostic Display, the black box with a sticker on it.
    He won the 1995 World Series of Poker with a deck of UNO cards.

    05' Discovery 3: Johnson Rods and 33in AT's
    00' P38 4.0: Sold
    99' P38 4.0: Gone
    93' RRC LWB: Sold

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  3. #2
    SITE ADMINISTRATOR RRToadHall's Avatar
    Join Date
    April 12th, 2006
    Location
    Maltby, WA USA
    Posts
    16,065

    Re: Range Rover On Board Diagnostic Display

    Once again you are a wealth of knowledge and a wiz at write ups. I've put a copy of this topside. I'm sure it will help many others out!
    My mind is aglow with whirling, transient nodes of thought careening through a cosmic vapor of invention.

  4. #3
    SENIOR ROVER
    Join Date
    October 1st, 2006
    Location
    Mobile, AL USA
    Posts
    1,172

    Re: Range Rover On Board Diagnostic Display

    Thanks man. I try my best to make myself useful.
    He won the 1995 World Series of Poker with a deck of UNO cards.

    05' Discovery 3: Johnson Rods and 33in AT's
    00' P38 4.0: Sold
    99' P38 4.0: Gone
    93' RRC LWB: Sold

  5. #4
    SENIOR ROVER
    Join Date
    July 16th, 2006
    Location
    Adelaide, Australia
    Posts
    1,396

    Re: Range Rover On Board Diagnostic Display

    Great write up. If only we had them over here... Nice work anyway Doc.
    rufant

    1994 Range Rover LSE
    1987 BMW M3
    1987 BMW 635CSi
    1965 Ford Anglia
    2004 Whyte PRST-4
    2009 Jamis Dragon 29er

  6. #5
    JUNIOR ROVER
    Join Date
    June 30th, 2008
    Location
    Cobblers Knob, IN
    Posts
    795

    Re: Range Rover On Board Diagnostic Display

    Ta, Doc Leo!
    1990 RRC
    http://2guyz.info/2g/UJ/handrover.jpg

    When the people fear the government, that is tyranny. When the government fears the people, that is liberty. -- Thomas Jefferson

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