Yaris D4D 6-speed manual UK 2009 RPM trembling issue

[Kyriakos]

Hi!

First post to this forum! I am desperate! I cannot find any solution to this problem. Well as you can see on the video the RPM is always trembling when i start the car and it is idel. It stops after 5-10 minutes.

Does any of you has any suggestion on what might be causing this issue?

https://www.youtube.com/watch?v=CzfF7WQRQx8

Thank you!

[FROSTYBALLS]

Although I'm more used to petrol engines, looks to me as though the idle speed is too low at approx 500rpm. 

[Kyriakos]

Thanx FROSTYBALLS for your response. The thing is that it stops doing that after a while.

FYI

EGR has been cleared

[Perfection]

My 2010 reads around approx 600rpm when idle...

 

Not sure what causes the, but could be the idle valve control. How does the car drives? Is it jerky?

[Kyriakos]

Driving is perfect except those 5 10 minutes at the beginning. Sad thing is that  i took the car to 5 different garages and no one could help me with this. Forum team is my only hope now

[Devon Aygo]

There is a Technical Service bulletin from Toyota which appears to include your symptoms:

Ref : EG-0054T-0110-EN

Subject: Difficult to start / unstable idle in cold condition

Models: Auris, Corolla, Urban Cruiser, Yaris, IQ

Model codes: NDE150, NLP110, NLP115, NLP90, NUJ10

DESCRIPTION OF PHENOMENON : Some customers may complaint about either of the following conditions:

• Engine is difficult to start in a certain engine temperature range (below 5°C).

• Engine runs very unstable for a very short period directly after cold start.

PRODUCTION CHANGE: Injector spray angle is changed, in order to better match with the swirl condition inside the combustion chamber at low temperature. In parallel a new E/G software is available. Fix instigated from engine # 1079560 December 2009

REPAIR PROCEDURE: Reprogram the ECU with the latest available software and apply a new label with correct ECU part number. Replace all 4 injectors.

IMPORTANT:

1. Never mix pre and post countermeasure injectors on the same engine!

2. Always reprogram with latest available software after installing new injectors!

[Kyriakos]

Thank you Devon!

I will print those instruction and handle it over the garage. Thing is as far as i recall they have reprogrammed the ECU with the latest available update. The issue dissapera for 15- 20 days and then it came back again!