Paging viosTRD

This post has been edited by DoomCognition: Jul 20 2013, 12:26 PM

Could it be simply caused by dirty, oily throttle body?

Manual start stop function lah. Engine stops itself, but owner has to start again.

At least it is half-decent then

This post has been edited by dares: Jul 20 2013, 01:53 PM

my opinion is the RPM is too low that the engine die
i dn't know abt vios
but my dad's waja last time got this problem...the RPM is too low
he took to workshop, they adjusted it...thn its gine

inb4 vios best car in the world
inb4 toyota engine will not die in traffic light
inb4 isolated case
inb4 driver's fault, not the car

inb4 no buy TRD Sportivo spec

I think it's kinda common for the new 4-speed gearbox.

My dad's Camry also like that. Rpm go super low then raise back again when come to a stop. But not so serious until engine stop.

TS u can try to shift to N first before the car stops.

Yes mr. Genius. Do drive your dugong to any outside workshop and ask the mechanic to adjust the idling RPM for you, then come back here and tell us he whack your head with a spanner or a hammer.

Dugong uses drive-by-wire throttle control, the only way you can adjust the idling RPM is to tweak the ECU. The only Vios that can adjust idling RPM old-school style with a screwdriver is the old gen Vios, which uses cable-driven throttle.

lulz

Old and New Vios also use ECU.

Old Vios has cable-driven throttle, therefore you can send to outside workshop to adjust idling RPM.

New Vios (dugong) use drive-by-wire throttle, therefore outside workshop cannot adjust the idling.

Understand the difference?

Sorry... from what I know there is nothing to adjust. Problem is elsewhere.

What do you adjust for cable driven throttle?
- The throttle opening ?? it should be the IACV that control amount of air going in right?
- The TPS sensor position ?? unless something was changed at the TB, the TPS sensor should not be touched.

In the TS's case the problem memang is elsewhere, I suspect the O2 sensors as his case is similiar to my friend's.

For cable throttles, there is a screw on the throttle body that directly adjusts the throttle valve opening when idling.

O2 sensor faulty normally got check engine light.... plus bad fuel economy. Have to scan for fault code and monitor closed loop feedback with OBD2 scan tool to check.

Never worked on a Vios engine.. but normally throttle valve is fully closed during idling for cable driven TB. Air metering in to keep engine running in idle is control by a separate IACV.

Very weird that Vios doesn't use similar setup with IACV but got screw to adjust throttle valve directly for cable driven.

My guess is O2 sensor faulty will only throw up CEL if it is not responding. If it is feeding bad data to the ECU, the ECU won't know anything is wrong. My friend didn't encounter CEL also until he completely stalled.

the idling screw serves as some sort of easy override on top of the IACV control. This is not limited to just the old Vios, most cable driven TBs have this.





EDIT: my mistake, it doesn't adjust the throttle valve directly, but rather the opening of an alternate air flow route.

This post has been edited by dares: Jul 20 2013, 05:56 PM

Ah... ic ic... there is another separate path for the air... adjusting screw does not mess with the throttle valve position.

Yep, edited my above post to mention that, my mistake