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Home >> Lexus >> 1998 >> SC 400 >> Repair and Diagnosis >> Brakes >> Traction Control >> Traction Control System >> Circuit Tests >> DTC 47 Or 48: Sub-Throttle Position Sensor Circuit (GS300) >> Circuit Description

Circuit Description

Sub-throttle position sensor detects opening angle of sub-throttle valve and sends signal to ABS/TRAC ECU. If incorrect signal is input, ABS/TRAC ECU prohibits TRAC system operation. DTC 47 is set when ABS/TRAC ECU detects deviation of 5 steps or more to the closed side of idle step during sub-throttle initial check. DTC 47 is also set when ABS/TRAC ECU detects zero voltage on IDL2 terminal even though sub-throttle is commanded to fully closed position during sub-throttle initial check. DTC 47 is also set when ABS/TRAC ECU detects voltage of 1.45 volts or more on VSH terminal while idle switch is on. DTC 48 is set when TRAC ECU detects 4.9 volts or greater on VSH terminal, or TRAC ECU detects .2 volt or less on VSH terminal with IDL2 switched off. Sub-throttle position sensor signal is transmitted to TRAC ECU from Engine Control Module (ECM). If a problem occurs at engine both ECM and TRAC ECU will detect it. Possible causes are:

NOTE: Clear DTC after completing repairs. See CLEARING DIAGNOSTIC  TROUBLE CODES (DTCS).
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