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EC-358 [QG (WITH EURO-OBD)] DTC P0420 THREE WAY CATALYST FUNCTION (M/T MODELS) 3. CHECK INTAKE AIR LEAK Listen for an intake air leak after the mass air flow sensor. OK or NG OK >> GO TO 4. NG >> Repair or replace. 4. CHECK IGNITION TIMING Check the following items. Refer to . OK or NG OK >> GO TO 5. NG >> Follow the “Basic Inspection”. 5. CHECK INJECTORS 1. Stop engine and then turn ignition switch “ON”. 2. Check voltage between ECM terminals 22, 23, 41, 42 and . OK or NG OK >> GO TO 6. NG >> Perform EC-526, "Diagnostic Procedure" . 6. CHECK IGNITION SPARK 1. Turn ignition switch “OFF”. 2. Disconnect ignition coil assembly from rocker cover. 3. Connect a known-good spark plug to the ignition coil assembly. 4. Place end of spark plug against a suitable ground and crank engine. 5. Check for spark. OK or NG OK >> GO TO 7. NG >> Check ignition coil with power transistor and their circuit. Refer to . Items Specifications Ignition timing 8 ° ± 5 ° BTDC (in “Neutral” position) Target idle speed 700 ± 50 rpm (in “Neutral” position) Battery voltage should exist. MBIB0030E SEF575Q |