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Home >> Lexus >> 1997 >> SC 400 >> Repair and Diagnosis >> Brakes >> Traction Control >> Traction Control System >> Circuit Tests >> DTC 51: Engine Malfunction Detection Circuit >> Circuit Description
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Circuit Description

If an engine DTC is present, TRAC system is prevented from functioning. On GS300, DTC is set when TRAC ECU detects one volt or less on terminal TR5 with engine speed of 500 RPM or greater for more than one second. On LS400, DTC is set when 1.5 volts is detected on terminal LBL for 10 seconds or more. On SC300 and SC400, DTC is set when problem signal is detected in engine control system with engine speed of 500 RPM or greater for 7 seconds. Possible causes are:

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