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TROUBLESHOOTING MULTIPORT FUEL INJECTION (MPI) <4G1> 13B-57 Code No. P0123: Throttle Position Sensor (Main) Circuit High Input OPERATION • A power voltage of 5 V is applied to the elec- tronic-controlled throttle valve (terminal No. 2) • The power voltage is earthed to the engine-ECU (terminal No. 30) from the electronic-controlled • The sensor signal is inputted to the engine-ECU (terminal No. 15) from the electronic-controlled FUNCTION • The throttle position sensor converts the throttle valve position into voltage and inputs it into the • The engine-ECU controls the throttle valve posi- tion. TROUBLE JUDGMENT Check Condition • Ignition switch is in "ON" position. Judgment Criterion • Throttle position sensor (main) output voltage is more than 4.8 V. PROBABLE CAUSES • Failed throttle position sensor (main) • Open/short circuit and damage in throttle position sensor circuit or loose connector contact • Failed engine-ECU AK402679 6 1 2 3 4 5 19 21 20 18 17 16 15 14 1213 11 8 9 L 10 37 38 39 404142434445464748495051 22 23 24 252627282930313233343536 7 5 3 1 6 4 2 5 V 31 2 Electronic-controlled B-W R-W Y-R Engine-ECU 15 30 1 4 Throttle Position Sensor (main) Circuit A-107 A-114 (main) Hall IC AF Wire colour code Main Index Group TOC |