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TROUBLESHOOTING DIESEL FUEL 13A-172 Code No. P0204: No. 4 Injector Circuit Malfunction <Euro5> OPERATION • Driving power is supplied from the engine-ECU (terminal No. 25) to the No. 4 injector (terminal • The engine-ECU (terminal No. 27) turn on the power transistor to flow current to the No. 4 injec- FUNCTION • The engine-ECU monitors peak current during injector drive control to detect disconnection in TROUBLE JUDGMENT Check Conditions • Ignition switch is in ON position • Battery positive voltage is 8 V or more. • Except during the engine cranking period • When an engine-ECU internal capacitor is allowed to be charged Judgment Criterion • When the peak current of the No. 4 injector circuit is not detected, the circuit is judged to be open. PROBABLE CAUSES • Failed No. 4 injector • Open/short circuit or harness damage in No. 4 injector circuit or loose connector contact • Failed engine-ECU AKA00099 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 1 2 AO Wire colour code R-Y Y-G No. 4 1 2 25 27 Engine-ECU A-129 C-105 No. 4 Injector Circuit |