Lexus SC300 / Lexus SC400. Manual — part 230

DIAGNOSTIC TROUBLE CODE
CLEARANCE

Using SST, connect terminals Tc and E1 of DLC2 or DLC1.
SST 09843–18020

IG switch ON.

3. Clear the diagnostic trouble codes stored in ECU by

depressing the brake pedal 8 or more times within 3 seconds.

Check that the TRAC indicator light shows the normal code.

Remove the SST from the terminals of DLC2 or DLC1.
HINT: Cancellation can also be done by removing the DOME
fuse, but in this case, other memory systems will also be can-
celled out.

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BRAKE SYSTEM

TRACTION CONTROL SYSTEM (TRAC)

BR–171

DIAGNOSTIC TROUBLE CODE CHART

If a malfunction code is displayed during the diagnostic trouble code check, check the circuit listed for that code
in the table below and proceed to the page given.
HINT: If the TRAC indicator light lights up and the TRAC indicator light does not blink when the Diag. code is
checked, check the blinking pattern of the ABS warning light and perform troubleshooting of the ABS system.

*1: If a malfunction is detected, the TRAC OFF indicator light lights up.
*2: Indicator light does not lights up even if an error is detected.
*3: If a malfunction is detected, the TRAC OFF indicator light or TRAC indicator light light up.

BR–172

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BRAKE SYSTEM

TRACTION CONTROL SYSTEM (TRAC)

PROBLEM SYMPTOMS CHART

If a normal code is displayed during the diagnostic trouble code check but the problem still occurs, check
the circuits for each problem symptom in the order given in the table below and proceed to the page for
troubleshooting.

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Symptoms

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Inspection Circuit

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See page

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TRAC does not oper-
ate.

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Only when 1.~5. are all normal and the problem is still occurring, replace
the TRAC ECU.

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BR–170