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There is a technical service bulletin from Toyota reference EG-0004T-0110-EN which states;
DESCRIPTION OF PHENOMENON
Some customers may explain about white smoke from the exhaust. Auris, Avensis, Verso & Rav4 equipped DPNR equipped vehicles only!
PRODUCTION CHANGE
The ECU software has been improved
The bulletin describes a diagnosis process checking: Stored fault codes, 5th injector operation, inspection of intake/exhaust for air leaks, Calculation MAF information, Cleaning/Clearing EGR & intake manifold of carbon, Reprogramming of the engine ECU with updated software and finally a confirmation of DPNR operation.
Usually the issue is fixed with the ECU reprogramme
PRODUCTION CHANGE
The ECU software has been improved.
The bulletin requires the correct operation of:
5th injector, replace if faulty
Check for air leaks, repair as required
Confirm air intake volume, replace air filter if out of spec
Check MAF operation, replace MAF is faulty
Check EGR operation, clean or replace as required
Check intake manifold for blockage, clean if clogged
Carry out forced DPNR regeneration, if regen fails replace DPNR
If any of the above are out of spec then they need attention then a reprogramming of the ECU with updated software is required, if they are all OK just the software update is required.
