LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 1990 >> LS 400 >> Repair and Diagnosis >> Brakes >> Traction Control >> Traction Control System >> Diagnostic Charts >> Code 51: Engine Malfunction Detection Circuit >> Circuit Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit Description

If the trouble (trouble which causes CHECK engine warning light to light up) occurs in the engine control system, this circuit senses the trouble and prohibits TRAC control.

CODE 51 DIAGNOSTIC

Code No. Diagnosis Trouble Area
51 Problem has occurred in engine (CHECK engine warning light lights up) when engine RPM is 500 RPM or more. Engine control system. Harness or connector between ABS & TRAC ECU and engine & ECT ECU. (Short in TRS harness).
scientia non olet · About LEMON Manuals