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 Why engine die when the car stop at traffic light, help

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unitron
post Jul 20 2013, 04:56 PM

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QUOTE(dares @ Jul 20 2013, 04:34 PM)
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?
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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.
unitron
post Jul 20 2013, 05:42 PM

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QUOTE(dares @ Jul 20 2013, 05:08 PM)
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.
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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.
unitron
post Jul 20 2013, 05:55 PM

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