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What gets diagnosed when on computer?

  • 31-08-2015 2:48pm
    #1
    rugbyman
    Registered Users Posts: 1,783 ✭✭✭


    Hello Everybody.

    I have just got two modern cars on the road after some time lying up.
    I am inclined to go to the main dealer (or are good indys as able) to ask for a diagnosis on their computer.

    will this tell me if spark plugs are ok,
    will this tell me if injectors are ok
    will this tell me if injector pump settings are ok,
    ( if not, can they be adjusted via the computer by the technician)


    My hope is to pay for the expert diagnosis and perhaps do some of the stuff myself, like plugs


    on a separate note, one of the cars is an MX5, a long (12 inch plus) part of the induction system has been left off by the chap who reassembled the front end after a slight accident. it appears to go under the bumper and mate up to the induction pipes. Will this alone affect the smooth running of the engine. I imagine the answer is yes, but looking for advice


Comments

  • #2
    Voodoomelon
    Registered Users Posts: 9,662 ✭✭✭Voodoomelon


    Diagnosis typically only covers fault codes thrown by certain sensors or the failure of certain modules. The process won't tell you if plugs/injectors/pumps are performing optimally etc, only if they have a fault.

    Certain cars will show service intervals for certain parts etc but again not the current condition of the parts.


  • #3
    jimgoose
    Registered Users Posts: 20,174 ✭✭✭✭jimgoose


    Have a read of this:

    https://en.wikipedia.org/wiki/On-board_diagnostics

    In short, the computer will monitor various sensort outputs - generally in the form of voltages and/or rates of voltage change - and record Diagnostic Trouble Codes, a.k.a. DTCs a.k.a. "fault codes" in the event of difficulties. The computer only knows what it knows, i.e. not much. Actual component-level diagnosis is a job for a technician/mechanic/enthusiastic amateur fartbollix. :D


  • #4
    kimjongun
    Registered Users Posts: 11 ✭kimjongun


    probably no need to scan the codes right now. Pull the sparkplugs - give them a clean and a sand - put them back in - or replace them.
    Its pretty straightforward.
    Clear the tank - either pump it or get some additive from an autofactors specifically for moisture in a tank.

    Buy a cheap OBD code reader - clear any error codes and take it for a drive for 15 mins.

    Scan it again after the drive and see if there are any new error codes.


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