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P0127 IAT SENSOR EC-721 < COMPONENT DIAGNOSIS > [QR25DE EXCEPT FOR CALIFORNIA] C D E F G H I J K L M A EC N P O NOTE: Perform the following steps before engine coolant temperature is above 96 °C (205°F). 2. Turn ignition switch ON. 3. Select “DATA MONITOR” mode with CONSULT-III. 4. Start engine. 5. Hold vehicle speed at more than 70 km/h (43 MPH) for 95 consecutive seconds. CAUTION: Always drive vehicle at a safe speed. 6. Check 1st trip DTC. With GST Follow the procedure “With CONSULT-III” above. YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000004349693 1. CHECK GROUND CONNECTION 1. Turn ignition switch OFF. 2. Check ground connection E9. Refer to Ground Inspection in . Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace ground connection. 2. CHECK INTAKE AIR TEMPERATURE SENSOR EC-721, "Component Inspection" Is the inspection result normal? YES >> GO TO 3. NO >> Replace mass air flow sensor (with intake air temperature sensor). 3. CHECK INTERMITTENT INCIDENT GI-42, "Intermittent Incident" . >> INSPECTION END Component Inspection INFOID:0000000004349694 1. CHECK INTAKE AIR TEMPERATURE SENSOR 1. Turn ignition switch OFF. 2. Disconnect mass air flow sensor harness connector. 3. Check resistance between mass air flow sensor terminals as fol- lows. Is the inspection result normal? YES >> INSPECTION END NO >> Replace mass air flow sensor (with intake air tempera- ture sensor). Terminals Condition Resistance k Ω 1 and 2 Intake air temperature °C (°F) 25 (77) 1.800 - 2.200 JMBIA1624ZZ |