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Thread: Mitsubishi Lancer 1.6 2007 (4G18) auto-choke problem

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    Default Mitsubishi Lancer 1.6 2007 (4G18) auto-choke problem

    The bottom line :

    "when i start the car in the morning or when i turn on the AC, the auto-choke doesn't work and rpm go down "

    the story
    last year one pin of auto choke connector as shown in pic got broke. i went to an electrician who soldered it and it worked fine. About two weeks back i got CNG kit serviced and noticed the above problem. Yesterday. i went to an electrician in pindi saddar who opened the throttle body and the auto-choke (probably the correct name is servo-kit) and after checking it with a tester and light method told me that he didn't find anything wrong in but it ain't working. Now;

    -- there is no engine check light
    -- everything else is working good
    -- i'm not sure if the auto-choke sensor is faulty or its wiring or its connector

    Question

    -- how to check auto-choke interdependently, i mean take it out and than what ??
    -- there are 6 wires in its connector what currents do they carry ???

    the pics (not the original pics but downloaded from net to give an idea)

    pic 1 : auto-choke sensor location in engine
    Mitsubishi Lancer  16 2007 4g18  autochoke problem -1188572

    pic 2 : auto-choke with the connector
    Mitsubishi Lancer  16 2007 4g18  autochoke problem -1188573



    (pics are not loading right now)


    Please help
    "You have not lived today until you have done something for someone who can never repay you."

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    just did :

    -- hard reset .. no improvement
    -- check voltages on all points of six points of connector, trying to make a diagram while typing

    . (0.05-0.1vdc) .(positive 12 v) . (battery negative)
    . (battery negative) . (positive 12v) . (0.05 - 0.1vdc)

    the voltages on 2 points above increase with inc in accelaration .. turning ac on or off makes no difference .. what does this mean i have no idea

    the battery negative was checked with the help of a battery lamp
    "You have not lived today until you have done something for someone who can never repay you."

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    I went to a computerized scanner shop in G-10 as well but after putting on scanner he didn't come up with a solution excet that he told me to come again today and said he will solve the issue but didn't mention how ...

    I'm left with two options

    -- buy a kabli throttle body complete (individual sensors are not available generally), then try to find if the problem is resolved
    -- go to mitsubishi motors and let them diagnose the issue but my general concept is that they will give me a long list of car issues and a bill to compliment it


    desperately in need of advice
    "You have not lived today until you have done something for someone who can never repay you."

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    anyone ??
    "You have not lived today until you have done something for someone who can never repay you."

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    Default

    replace auto choke. i replaced mine last year. 03335116297 Zahid (the mechanic i got it done from)

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    Dont replace anything until u get a diagnostic result , let them scan the car - the choke should turn ON as soon as pulse is received when the AC is turned ON via ECU - Direct
    Are ur cooling fans Direct ? ask an electrician to check the compressors head pressure , even if the choke is working , u'll observe a drop in rpm if the head pressure is abnormal
    when did u last change/clean ur condenser ?
    LIVE 4 NOTHING .........................BUT DIE 4 SOMETHING

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    Quote Originally Posted by faisal31 View Post
    replace auto choke. i replaced mine last year. 03335116297 Zahid (the mechanic i got it done from)
    i called him ... he has got one and quoted me a price of rs 3500/- ... on tel he won't bargain but says the best he could do is to no charge for fitting and setting ... apparently he seems to be tech good .. tied up a meeting tomorrow ... can u comment on its price
    "You have not lived today until you have done something for someone who can never repay you."

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    the price seems to be ok . yes he is a good mechanic . i have had a good experience with him but some friends recommend not to leave the car with him.

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    had another minor issue related to heating so went to mitsubishi motors today

    the cleaned throttle body
    did a computer scan
    ruled out my other fears
    finally gave verdict that auto-choke (also known as IAC and ISC stepper motor) is not functioning properly

    ... auto-choke was working when connected outside the housing but doesn't do its job of racing up the engine ... so the mitsubishi motors expert told me that it is not working on load ... lets hope so

    anyone having a better idea or an advise ... i'm still in doubt whther a replacement would work or not
    "You have not lived today until you have done something for someone who can never repay you."

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    Quote Originally Posted by faisal31 View Post
    the price seems to be ok . yes he is a good mechanic . i have had a good experience with him but some friends recommend not to leave the car with him.
    he says he works in BMW service shop .. with his accent it was difficult to understand but that is what gathered ... thanks for the advice and help ... can u recall the exact problem u were facing ... what i have is :

    -- decrease in rpm by 400 when ac is turned on
    ... no increase in rpm in early morning or cold start
    ...no increase in rpm when an electrical load is put like head lights, power-steering is turned, defogger or fan turns on

    overall this all points to a malfunc auto-choke but still in doubt
    "You have not lived today until you have done something for someone who can never repay you."

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    same problem rpm drop at all these fuctions. plus on cng it would drop too

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    Quote Originally Posted by Naweed View Post
    he says he works in BMW service shop .. with his accent it was difficult to understand but that is what gathered ... thanks for the advice and help ... can u recall the exact problem u were facing ... what i have is :

    -- decrease in rpm by 400 when ac is turned on
    ... no increase in rpm in early morning or cold start
    ...no increase in rpm when an electrical load is put like head lights, power-steering is turned, defogger or fan turns on

    overall this all points to a malfunc auto-choke but still in doubt
    There is also a possibility that the ecu is simply sending no signal to the auto choke. I mean to say ecu is not sensing any load on the engine. There can be a malfunction in the ecu or some error code. Have you done an ecu refresh or reset via a scanner. If not try that as well

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    Quote Originally Posted by faisal31 View Post
    same problem rpm drop at all these fuctions. plus on cng it would drop too
    thanks a lot ... i'll give an update tomorrow after paying a visit to zahid tomorrow
    "You have not lived today until you have done something for someone who can never repay you."

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    Quote Originally Posted by a_n_memon88 View Post
    There is also a possibility that the ecu is simply sending no signal to the auto choke. I mean to say ecu is not sensing any load on the engine. There can be a malfunction in the ecu or some error code. Have you done an ecu refresh or reset via a scanner. If not try that as well
    i did both ... thrice i reset the system but nothing then today got a complete diagnostic scan by mitsubishi motors .. in fact i was also thinking on the same lines but now that i realize that had it been an ecu malfunction the diagnostic unit might have given some indication so i'm quite positive that fitting the new auto-choke will resolve the issue ... thanks
    "You have not lived today until you have done something for someone who can never repay you."

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    mitsubishi 6 wire idle control servo motor is not a simple on off system, Its a stepper motor, if your genius electrician hot tested it with 12V test lamp kiss it good bye.

    Instead of wording it out, I found you a very good document to test it.

    Stealth 316 - ISC Servo Motro
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    mitsubishi 6 wire idle control servo motor is not a simple on off system, Its a stepper motor, if your genius electrician hot tested it with 12V test lamp kiss it good bye.

    Instead of wording it out, I found you a very good document to test it.

    Stealth 316 - ISC Servo Motro
    Thanks ... the link was really very informative
    The electrician did check it with a test lamp and i was the second one to do this (ignorance has no limits .. ) ... then i also used a multi meter to check voltages on various pins ... now i know that it should have been resistances that should be read ... since earlier i was looking on net as auto-choke so didn't get any data but sinc yesterdayi have read a lot on it

    the readings on diagnostic unit varied from 9-13 (step units as it showed) and when AC was turned ON those climbed and fixed on 100 so after reading this article my guess the ecu sinals are coming .. its the motor

    would u recommend that i open and clean it as given in the link or there is no chance of its revival
    "You have not lived today until you have done something for someone who can never repay you."

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    took out the isc motor out of its housing to find that it is totally sealed ... so the only option left is to replace it
    "You have not lived today until you have done something for someone who can never repay you."

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    So the problem has finally been resolved by replacing the auto-choke
    Zahid was a real expert when it comes to lancers .. I liked the way he assessed the situation and perform some basic checks before replacing the item ... overall a few settings were not at default he did a reset of all related adjustments then fitted auto-choked it and then re-adjusted the settings .. and most of all i learned a lot from him by asking a million questions as usual

    @faisal31 thankyou for giving me the contact no of zahid
    and thankyou all for sharing your views specially @Xulfiqar (because i know u r the most wanted person on this forum, so taking time and replying to query was a real honor for me)
    "You have not lived today until you have done something for someone who can never repay you."

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    Quote Originally Posted by Naweed View Post
    So the problem has finally been resolved by replacing the auto-choke
    Zahid was a real expert when it comes to lancers .. I liked the way he assessed the situation and perform some basic checks before replacing the item ... overall a few settings were not at default he did a reset of all related adjustments then fitted auto-choked it and then re-adjusted the settings .. and most of all i learned a lot from him by asking a million questions as usual

    @faisal31 thankyou for giving me the contact no of zahid
    and thankyou all for sharing your views specially @Xulfiqar (because i know u r the most wanted person on this forum, so taking time and replying to query was a real honor for me)
    anytime brother.

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    @ Naweed I am facing this issue also from yesterday morning, before that my car was running smooth, yesterday on my way to office my car start dropping its rpm and on every signal where I stop my car it shuts down, at that time i didn't paid that much attention towards that but in evening when I start my car i have to keep the paddle pressed other wise it keep on shutting down, before that when ever I start my car in morning its rmp goes to 1500 and drop down when car raise some temp, I read your thread and it seems like my car also facing the same issue which your car faced, what you suggest me to do right now, should I straight fwd replace the auto choke or check something else before that. please reply asap ..thanks

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