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EC-264 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P0420, P0430 THREE WAY CATALYST FUNCTION Is the inspection result normal? YES >> INSPECTION END NO >> Go to Diagnosis Procedure INFOID:0000000005536663 1. CHECK EXHAUST SYSTEM Visually check exhaust tubes and muffler for dents. Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace malfunctioning part. 2. CHECK EXHAUST GAS LEAKAGE 1. Start engine and run it at idle. 2. Listen for an exhaust gas leakage before the three way catalyst (manifold). Is exhaust gas leakage detected? YES >> Repair or replace malfunctioning part. NO >> GO TO 3. 3. CHECK INTAKE AIR LEAKAGE Listen for an intake air leakage after the mass air flow sensor. Is intake air leakage detected? YES >> Repair or replace malfunctioning part. NO >> GO TO 4. 4. CHECK IGNITION TIMING Check idle speed and ignition timing. EC-13, "BASIC INSPECTION : Special Repair Requirement" For specification, refer to . Is the inspection result normal? YES >> GO TO 5. NO >> Follow the EC-13, "BASIC INSPECTION : Special Repair Requirement" 5. CHECK FUEL INJECTORS 1. Stop engine and then turn ignition switch ON. 2. Check the voltage between ECM harness connector terminals. DTC ECM Condition Voltage (V) Connec- tor + – Terminal Terminal P0420 F8 33 [HO2S2 (bank 1) signal] 35 (Sensor Keeping engine speed at 2,500 rpm The voltage fluctuation cycle takes → 0 - 0.3 → 0.6 - 1.0 P0430 34 [HO2S2 (bank 2) signal] PBIB1216E |