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P0112, P0113 IAT SENSOR EC-175 < DTC/CIRCUIT DIAGNOSIS > [QR25DE] C D E F G H I J K L M A EC N P O P0112, P0113 IAT SENSOR Component Description INFOID:0000000009480817 The intake air temperature sensor is built into the mass air flow sen- sor (1). The sensor detects intake air temperature and transmits a signal to the ECM. The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the rise in temperature. <Reference data> *: This data is reference value and is measured between ECM terminal 50 (Intake air CAUTION: Never use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM termi- nals, such as the ground. On Board Diagnosis Logic INFOID:0000000009480818 DTC Confirmation Procedure INFOID:0000000009480819 NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. WITH CONSULT 1. Turn ignition switch ON and wait at least 5 seconds. 2. Check 1st trip DTC. 3. If 1st trip DTC is detected, go to WITH GST Follow the procedure “WITH CONSULT” above. Diagnosis Procedure INFOID:0000000009480820 1. CHECK GROUND CONNECTIONS 1. Turn ignition switch OFF. PBIA9559J Intake air temperature [ °C(°F)] Voltage* (V) Resistance (k Ω) 25 (77) 3.3 1.800 - 2.200 80 (176) 1.2 0.283 - 0.359 SEF012P DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0112 Intake air temperature An excessively low voltage from the sensor is • Harness or connectors (The sensor circuit is open or shorted.) • Intake air temperature sensor P0113 Intake air temperature An excessively high voltage from the sensor is |