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P0300, P0301, P0302, P0303, P0304 MISFIRE EC-273 < DTC/CIRCUIT DIAGNOSIS > [MR20DD] C D E F G H I J K L M A EC N P O 2. Disconnect corresponding A/F sensor 1 harness connector. 3. Disconnect ECM harness connector. 4. Check the continuity between A/F sensor 1 harness connector and ECM harness connector. 5. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector 6. Also check harness for short to ground and short to power. Is the inspection result normal? YES >> GO TO 14. NO >> Repair or replace malfunctioning part. 14. CHECK A/F SENSOR 1 HEATER EC-182, "Component Inspection" Is the inspection result normal? YES >> GO TO 15. NO >> Replace malfunctioning A/F sensor 1. Refer to . 15. CHECK MASS AIR FLOW SENSOR OUTPUT VOLTAGE WITH CONSULT 1. Install all removed parts. 2. Start engine and warm it up to normal operating temperature. 3. Select “MAS A/F SE-B1” in “DATA MONITOR” mode with CONSULT and check the indication under the *: Check for linear voltage rise in response to increase of engine speed. WITHOUT CONSULT 1. Install all removed parts. 2. Start engine and warm it up to normal operating temperature. 3. Check the voltage between ECM harness connector terminals. + − Continuity A/F sensor 1 ECM Connector Terminal Connector Terminal F27 1 F8 64 Existed 2 72 + Ground Continuity A/F sensor 1 Connector Terminal F27 1 Ground Not existed 2 + Ground Continuity ECM Connector Terminal F8 64 Ground Not existed 72 Monitor item Condition Indication MAS A/F SE-B1 Ignition switch ON (Engine stopped.) Approx. 0.4 V Idle (Engine is warmed-up to normal op- 0.7 - 1.2 V Idle to about 4,000 rpm 0.7 - 1.2 V → 2.4 V* |