Proton Wira Check Engine Light

[arsengal]

Thanks for the info Izso.

Anyway, I went to my usual Proton SC today, the pomen who fixed my car w the previous same issue did a diagnose again to my Wira. He plugged out the sensor attached to the TB while doing the diagnose and there is a faulty code detected, two actually. One is the TB, the other one is the exhaust sensor, perhaps its the O2 sensor. When he plug back the sensor to the TB, no faulty codes were detected. So then, he checked and checked again, finally he came to a conclusion where he changed my TB to a newer TB, although I just changed my TB few weeks back. Good thing is it came for free since I still have the warranty of the TB. Anyway he said, its still not conclusive whether the problem has been solved and added if the same matter arises again, quickly come to the SC to get it diagnosed. IF the same thing happened again, then the exhaust sensor/O2 sensor will be targeted along with the ECU. Damn I hope the ECU is fine. So for now, I'm just hoping the case is closed.

 

[^pomen_GTR^]

ok update for my CEL issues.... (4g92p auto-mmc ecu)

no longer happens....

at first my conclusion would be:

1) MAF sensor faulty (swapped with working sensor no effect)
2) dirty air filter (just changed)
3) faulty TPS sensor (re-adjusted but no effect)
4) clogged petrol filter (changed petrol filter-the old one full of dirty,rusty coloured fuel)
5) clogged gearbox internal sensor (plausible) (changed atf along with other parts above)

what was causing the CEL gone missing for good?

i whack my car accelerate full throttle from 1st,2nd,3rd,4th all the way with O/D off and then cycle with O/D on...then after cooling down and days after that no more CEL coming up......

the real cause is still a mystery..but my stronger conclusion would be the clogged/dirty gb internal sensor...because last time before my latest gb oil (atf) changed, it was past due for about 10k km than the original svc interval (20k km)

 

[Izso]

ok update for my CEL issues.... (4g92p auto-mmc ecu)

no longer happens....

at first my conclusion would be:

1) MAF sensor faulty (swapped with working sensor no effect)
2) dirty air filter (just changed)
3) faulty TPS sensor (re-adjusted but no effect)
4) clogged petrol filter (changed petrol filter-the old one full of dirty,rusty coloured fuel)
5) clogged gearbox internal sensor (plausible) (changed atf along with other parts above)

what was causing the CEL gone missing for good?

i whack my car accelerate full throttle from 1st,2nd,3rd,4th all the way with O/D off and then cycle with O/D on...then after cooling down and days after that no more CEL coming up......

the real cause is still a mystery..but my stronger conclusion would be the clogged/dirty gb internal sensor...because last time before my latest gb oil (atf) changed, it was past due for about 10k km than the original svc interval (20k km)

Nola. Your car merajuk you never take her for a hard and fast ride. Now that you have she's satisfied mah.

And I suspect it's probably carbon blockage on one of the sensors which cleared up after you gave it to her hard and horny. I mean hard and fast.

 

[^pomen_GTR^]

i'm thinking the same also......

she merajuk because always drive slow n steady stuck in traffic and get bored to death.....

perhaps also shows that regular servicing should NOT be extended so long....


so next time up would replace atf filter as well....

 

[cvkit17]

Well..mine just lighted up its check light today when my sis was driving it. Luckily she's already at car park. Couldn't get what's the prob so far...Ada hantu ka? >.<

 

[Izso]

O2 sensor la. On Wira's they last almost forever until about 10 years then sure KO

 

[arsengal]

Damn CEL light comes up again, for sure its not the TB problem now. I had it changed twice already. This time, it happens, idle RPM drops down to half of 1k or less. Then I pressed on the throttle a bit, went up to 2k then the RPM went very low and then engine went off. Turned off the car, take out the keys and then start it up again, only then it went back to normal, but CEL light is still there. Argh please not the ECU which is giving problem. Guys any recommended SC that I should go around Klang Valley to get my car checked? Want to try to change instead of keep going to Proton SC, yet problem ain't being solved.

And I notice, before the thing happens, my idle RPM keeps fluctuating a bit then went back to normal repeatedly w/o me stepping on the gas. Hmm

 

[stardex83]

any1 have any solution already.. i also facing this problem....

 

[Izso]

Damn CEL light comes up again, for sure its not the TB problem now. I had it changed twice already. This time, it happens, idle RPM drops down to half of 1k or less. Then I pressed on the throttle a bit, went up to 2k then the RPM went very low and then engine went off. Turned off the car, take out the keys and then start it up again, only then it went back to normal, but CEL light is still there. Argh please not the ECU which is giving problem. Guys any recommended SC that I should go around Klang Valley to get my car checked? Want to try to change instead of keep going to Proton SC, yet problem ain't being solved.

And I notice, before the thing happens, my idle RPM keeps fluctuating a bit then went back to normal repeatedly w/o me stepping on the gas. Hmm

I recommend giving maddriver a call. Not sure what his ID is in ZTH but on LY he's known as maddriver. Otherwise try Mitch Chong (PM for contact).

But from the looks of it, it's definitely one of your sensors. I have a spare cam position sensor (I think that's what it's called) cuz I had erratic idling at one of point of time and tried changing that after TB swap and all like you. Didn't work but if you do resort to this sensor let me know.

O2 sensor shouldn't suddenly work and fail off-and-on like that. I've only ever seen it work or not. Isn't too expensive to change.

And if it really is your ECU, suggest to consider aftermarket or halfcut. Ori Proton prices for the ECU is way too high

 

[cvkit17]

Almost 4got. My car with the CEL prob...the light came out when my sis started the car. My dad Unplugged the sensor attached to the TB (should be an air flow sensor?) and blew it. Then he reattached it and the light was gone. It's been more than a month and nothing happened. Hope nothing will happen. Might it be loose connections,etc?

 

[^pomen_GTR^]

that one is TPS sensor

 

[cvkit17]

Almost 4got. My car with the CEL prob...the light came out when my sis started the car. My dad Unplugged the sensor attached to the TB (should be an air flow sensor?) and blew it. Then he reattached it and the light was gone. It's been more than a month and nothing happened. Hope nothing will happen. Might it be loose connections,etc?

Well I think I should post an update here after the incident mentioned above. So far the car is running good and the check light doesnt appear anymore. So I guess it is problem solved. It has been more than 2 months now and no incident so far.

 

[1330bei]

Damn CEL light comes up again, for sure its not the TB problem now. I had it changed twice already. This time, it happens, idle RPM drops down to half of 1k or less. Then I pressed on the throttle a bit, went up to 2k then the RPM went very low and then engine went off. Turned off the car, take out the keys and then start it up again, only then it went back to normal, but CEL light is still there. Argh please not the ECU which is giving problem. Guys any recommended SC that I should go around Klang Valley to get my car checked? Want to try to change instead of keep going to Proton SC, yet problem ain't being solved.

And I notice, before the thing happens, my idle RPM keeps fluctuating a bit then went back to normal repeatedly w/o me stepping on the gas. Hmm

Hi arsengal,

Did you solve your problem? If, yes, please share. TQ

 

[mosesmk]

mine last time only the connector loose. damm panel workshop.even connector pin lock also cannot replace.some more claim my insurance so high.try to check for loose connector or something.