QUOTE(triads418 @ Mar 9 2008, 11:29 PM)
my proton wira aeroback 1.5 auto have this problem recently...i start the car for a while then the engine stall
so i went to mechanic and ask him to clean the throttle body, check the air filter...then when he put everything back and tune it with a computer device he said the circuit board in the throttle body going to spoil already...so he advised me to wait until it complete gone then change a new one....
my question is which circuit board he's referring to ? i ask him izzit to throttle body that he clean b4 that...see this picturehttp://www.hitachi-hap.com/products/Control_Units/etcu.jpg
or something else bcos i didnt see any circuit board on it
if that's the one i want to know the price range for a reliable/performance brand other than proton...
personally i dun feel like waiting for the thing to die out...so i want to change it asap
Added on September 20, 2012, 6:57 am
QUOTE(Walter Liew @ Sep 20 2012, 06:38 AM)
I am also using the wira 1.5 auto that perhaps uses the same part as yours.
I had problem with this throttle for many years and had been keep on changing it. I had came to a point where I was
truly not convince with foreman who are not electronically sound.
I came to a point I started to check on it myself.
So I started to use an electronic scope to diagnose all the throttle pin and all signal goes according as expected. But
occasionally the system still failed.
Finally I manage to figure out that the ECU (Electronic Control Unit) will stop controlling the throttle body once it loses
any signal from the throttle body. It will only control it back once you restart your engine.
Let me share with you how it works.
1. Once to turn ON the ignition key (without starting) , you should hear a SOUND like 'he he ta ta ta tak'. This is the
most important clue telling you that the ECU is calibrating the throttle body opening valve angle. Try again you
will find it happen everytime.
2. If step 1 happens each time, this means that your ECU and throttle are communicating and it should work.
3. Start your engine NOW. Then after a while try turn ON the air-con. You should see the RPM rises (abt 0.5sec)
before you aircon physically turn ON. This means that the ECU is working properly.
4. When you turn OFF, the aircon, the RPM should rise first and then drop back to the point when you starting your
5. Slightly engage the gear (ie N to D) making the lamp D ON without physically lock the gearbox, you again should
see the RPM rise. Repeat doing this you will find the RPM rises each time you try to engage the gear.
All the above are important clues telling that you throttle system is working.
As I know for WIRA(older model) it can still work without throttle body. You can try to unplug the connector to the
throttle body. Your car should start and the engine will not die off.
The engine only dies when the throttle try to work but work wrongly.
Note: Wander why I knew all this??? I am an electronic designer who write MCU programs and fully understand
how the program should behave. Meantime I am in the process of designing a throttle analyser hoping to
relief many foreman ignorance on this item.
Added on September 20, 2012, 9:55 am
QUOTE(usus @ Mar 28 2008, 10:33 AM)
thanks for the feedback...
the good thing is that no problemo with idling.
But stepper value is 0 always. After cleaning TB & induction box, my car maintains 900rpm no A/C. 300-400rpm on A/C & no fluctuate, fortunately. I'll just attempt clean stepper motor later on see any good results.
perdana one is same with FTO? 63mm?
I am Liew.
'But stepper value is 0 always. After cleaning TB & induction box, my car maintains 900rpm no A/C. 300-400rpm on A/C & no fluctuate, fortunately.'
The symptom above is nothing more than telling you that your car throttle body totally fail to operate.
A good throttle will keep your car rpm constant at (probably 800..900rpm) regardless of aircon On/Off.
However your car should still run but just not performing stable and engine shaking only.
Try to get a throttle fix up but make sure the shop give you warranty (i.e 3 to 6 months) otherwise just live with it.
Added on September 20, 2012, 10:09 am
QUOTE(the_catacombs @ Aug 15 2008, 01:20 PM)
dun need to drill hole lah...
Don't drill hole, it is not the right approach.
The car throttle work to save for fuel at all condition and not only for aircon. Most foreman told u it is just for 'aircon' but in actual fact it is for everyting.
Among them are
1: When you engage gear, the engine rpm increase to prepare you with more power.
2: When you turn ON the headlamp, the rpm also increase.
3: More saving, when you car comes to a complete stop, your rpm reduces further. It is great saving in traffic jam
Using traditionally air suction valve to regulate for air con is 30 to 40 years technology and it is rather unstable
Added on September 20, 2012, 10:16 am
QUOTE(usus @ Mar 24 2008, 03:14 PM)
if stepper motor is not working, does it have any effect on the car?
Some car can work without this servo motor but some cannot live without it. For newer car it is a must.
Added on September 20, 2012, 10:20 am
QUOTE(viqq @ Aug 17 2008, 02:12 PM)
I heard this is a common problem among wira/satria owners.
I myself having throttle body problems too. The gear inside the throttle body broke and after changed still the same problem which is the RPM go up and down even though I didn't press the accelerator. So mechanic asked me to change throttle body. I got myself a 1.5 model for my 1.3 model which the mechanic said should be compatible. That throttle body didn't come with a gasket so the mechanic made 1 himself.
Ok so everything went well, the RPM doesn't go up and down anymore, but the engine will subsequently die in a sudden. No warning no anything, just die. Also after changing the throttle body so many problems jor.. Even my CHECK ENGINE lights are all gone. Stupid mechanic ar~~ More problems after changing throttle body.
I sound like you get a mechanic who knows nothing about electronic. He is just take you for a ride.
All this need knowledge and experience and not simply swap with compatible.
The engine ECU and throttle has to match, otherwise it will not perform as expected.
Added on September 20, 2012, 10:31 am
QUOTE(the_catacombs @ Jan 18 2011, 06:09 PM)
nope u dont need to change ur throttle body... if u dont wanna spend so much servicing ur ISC gears, use FICD... as for ur unstable idling, remove ur throttle body and clean it thoroughly... change new throttle body gasket to prevent manifold leak... check and replace (if necessary) the plastic idle screw nipple...
Take note that the throttle mechanism without the motor or gear working , can also ramp up and down.
This can happen if your idling setting is too high and can be nothing to do with the electronics.
Thanks.This post has been edited by Walter Liew: Sep 20 2012, 10:31 AM