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Useful ECU code links

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    #2
    Darragh29
    Closed Accounts Posts: 7,097 ✭✭✭Darragh29


    andrew_ireland wrote:
    Was just browsing and found this, dunno if it may be of interest to some of you:

    http://autorepair.about.com/od/obdcodedatabase/The_Exhaustive_Database_of_OBDI_and_OBDII_Engine_Codes.htm

    I'd say most people on here would find this information going completely over their heads, and before they even sit down to look at, how would the average Joe Soap get the codes from the ECU?


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    #3
    andrew_ireland
    Registered Users Posts: 156 ✭✭andrew_ireland


    Sorry, should've posted a bit more info!

    From http://autorepair.about.com/library/faqs/bl921d.htm

    READING DIAGNOSTIC CODES:
    • The Electronic Control Unit (ECU) monitors several engine sensors and actuators. If a problem occurs the information is stored in the ECU's memory for retrieval.
    • The codes are displayed by the red diode on the ECU. The codes are interpreted by the number of times and duration the diode flashes.
    • The red diode (•)will flash for 0.6 of a second with 0.6 of a second delay between flashes "X" number of times, this will represent units of ten.
    • Then there will be a delay 0.9 of a second and the red diode will flash for 0.3 of a second with 0.3 of a second delay between flashes "X" number of times, this will represent units of one.
    • There will be a delay of 2.1 seconds between codes.
    • For example, if the red diode flashes once and then flashes twice rapidly this should be interpreted as code 12. The codes are displayed in numerical order starting with the lowest and ending with the highest.

    EXTRACTING DIAGNOSTIC CODES:

    1. Access the ECU from below the panel under the carpet on the passenger side floor board and position it for observing the diode.
    2. Turn the ignition switch on (do not start the engine).
    3. Confirm that the "CHECK ENGINE" lamp in the instrument panel illuminates. If not, check the bulb and replace if faulty.
    4. Turn the diagnostic mode selector on the ECU fully clockwise for at least two seconds then turn the selector fully counterclockwise. The ECCS system is now in mode 2.
    5. Observe the diode and note the code(s) displayed. Note: Code 55 indicates all systems are okay.

    ERASING DIAGNOSTIC CODES:

    1. Turn the ignition key on.
    2. Turn the diagnostic mode selector on the ECU fully clockwise and wait more than two seconds then turn the selector fully counterclockwise. The ECCS system is now in mode 2.
    3. Turn the diagnostic mode selector on the ECU fully clockwise and wait more than two seconds then turn the selector fully counterclockwise. The ECCS system is now in mode 1. ECU memory is now erased.


    Haven't had a chance to try any of this yet but just thought it may be of use to others too.


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    #4
    VeVeX
    Registered Users Posts: 1,390 ✭✭✭VeVeX


    andrew_ireland wrote:
    Sorry, should've posted a bit more info!

    From http://autorepair.about.com/library/faqs/bl921d.htm

    READING DIAGNOSTIC CODES:
    • The Electronic Control Unit (ECU) monitors several engine sensors and actuators. If a problem occurs the information is stored in the ECU's memory for retrieval.
    ..........................................

    That only covers a Nissan Sunny. Most cars don't have LEDs on the ecu.

    The best way for a novice to see what's going on with their car when the engine management light comes on is a code reader. This device plugs into the diagnostic port of the vehicle and retrieves whatever diagnostic trouble code is being held on the ecu.

    Also when the problem has been fixed you can turn off the light yourself with out having to involve a main dealer.


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