This service bulletin is to inform you on how to handle “DTC P0420 / P0430″ cases for Yaris, Previa / Tarago, RAV4, Avensis Verso / Picnic. DESCRIPTION OF PHENOMENON • Engine MIL ON. • Code P0420 or P0430 in the engine ECU. • No influence on driveability or engine performance.
FIELD FIX PROCEDURE
1. Replace the exhaust manifold converter sub-assembly according to the Part No. Information table 2. Inspect Catalytic Converter efficiency by measuring O2 sensor signals, and replace converter if necessary (a) Refer to the oxygen sensor output signal waveforms below. HINT: • In case of normal operating catalyst, the output signal of the rear heated oxygen sensor shows very slow activity. • If the catalyst has deteriorated, the output signal of the rear heated oxygen sensors becomes very similar to that of front heated oxygen sensor. • If, based on the sensor signals, you judge catalyst is not working properly, replace catalyst and not the O2 sensors. 3. Upgrade ECU software (a) PREVIA ECU upgrade is available only on CD-ROM. (b) RAV4 ECU upgrade is available on CD-ROM or with upgrade files available from your distributor. HINT: Detailed procedures for reprogramming ECU’s for this issue are available in TSB: EG-2003 (Previa) and EG-2004 (RAV4) NOTICE: • If your diagnosis program card is version 10.0 or later → use CUW 5.0 Version • If your diagnosis program card is version 9.0 or 9.1 → use CUW 4.1 Version 4. Replace Engine ECU.

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