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P0127 IAT SENSOR EC-869 < DTC/CIRCUIT DIAGNOSIS > [MR EXCEPT FOR NISMO RS MODELS] C D E F G H I J K L M A EC N P O P0127 IAT SENSOR DTC Logic INFOID:0000000012198380 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct- ing the next test. 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. TESTING CONDITION: This test may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle. >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE With CONSULT 1. Wait until engine coolant temperature is less than 96 °C (205°F) - Turn ignition switch ON. - Select “DATA MONITOR” mode with CONSULT. - Check the engine coolant temperature. - If the engine coolant temperature is not less than 96 °C (205°F), turn ignition switch OFF and cool down engine. 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. 4. Start engine. 5. Hold vehicle speed at more than 70 km/h (43 MPH) for 100 consecutive seconds. CAUTION: Always drive vehicle at a safe speed. 6. Check 1st trip DTC. YES >> Proceed to . NO >> INSPECTION END Diagnosis Procedure INFOID:0000000012198381 1. CHECK INTAKE AIR TEMPERATURE SENSOR 1 Check intake air temperature sensor 1. Refer to EC-870, "Component Inspection" . Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-45, "Intermittent Incident" . NO >> Replace mass air flow sensor (with intake air temperature sensor). Refer to . DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause P0127 IAT SENSOR-B1 Rationally incorrect voltage from the sensor is • Harness or connectors (The sensor circuit is open or shorted) • Intake air temperature sensor 1 |