ES - 1st to 4th Gen (1990-2006) Forum for all 1990 - 2006 ES300 and ES330 models. ES250 topics go here as well.

Check engine and trac off

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Old 05-31-17, 08:00 PM
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sunnybasse
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Default Check engine and trac off

Root cause analysis(rca) of this warning light on instrument panel
Old 06-01-17, 11:09 AM
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nsghtbrwry
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This gets posted about once a week or so around here. Read the code(s).

Since the 1MZ engine uses the ACIS (variable-length intake) to modulate engine power for traction control/skid control purposes, any engine malfunction/code that may affect power output results in the ECM disabling TCS/VSC (and illuminating TRAC OFF to that effect). Solve the problem causing the CEL, and you get back your traction control.
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