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TROUBLESHOOTING DIESEL FUEL 13A-52 Code No. P0073: Intake Air Temperature Sensor No. 1 Circuit High Input <Euro5> OPERATION • A power voltage of 5 V is applied to the intake air temperature sensor No.1 output terminal (termi- • The power voltage is earthed to the engine-ECU (terminal No. 86) from the intake air temperature FUNCTION • The intake air temperature sensor No. 1 converts the intake air temperature into a voltage and • In response to the signal, the engine-ECU cor- rects the fuel injection amount, etc. • The intake air temperature sensor No. 1 is a kind of resistor, which has characteristics to reduce its TROUBLE JUDGMENT Check Conditions • Battery positive voltage is 8 − 16 V • 2 seconds later after the ignition switch has been in "ON" position or the engine has started up. Judgment Criterion • The intake air temperature sensor No. 1 output voltage is 4.87 V or more for 0.5 second. PROBABLE CAUSES • Failed intake air temperature sensor No. 1 • Open circuit or harness damage in intake air tem- perature sensor No. 1 circuit or loose connector • Failed engine-ECU AKA00356 1 2 3 4 5 6 7 8 9 10 1112 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 43 44 45 46 47 48 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 5 4 3 2 1 86 62 Intake air temperature Engine-ECU 1 2 Intake Air Temperature Sensor No. 1 Circuit B-L Y-L A-135 C-105 Wire colour code 5 V AB |