1991 LEXUS SC400 brake

DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the diagnostic trouble code chec\
k, 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 doe\
s not blink when the Diag. code is
checked, check the blinking pattern of the ABS warning light and perform trouble\
shooting of the ABS system.
BR±186BR±189
BR±190
BR±192
BR±196 BR±198
BR±200
BR±208
BR±216
BR±218
BR±220BR±189
BR±189
BR±190
BR±190
BR±190
BR±200 BR±208
*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 i\
ndicator light light up.
BR±172
±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)
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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.
 Symptoms\
 \
Inspection Circuit See page
 


TRAC does not oper-
ate.\
 
\

\

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

BR±170
 


\
 
\

\

1. Check the diagnostic trouble code, reconfirming that the normal code \
is
output. 


BR±192
 \
 \
2. IG Power Source Circuit. BR±228
 


\
 
\

\
3. Check the hydraulic circuit for leakage. 

BR±190
 \
 \
4. Speed Sensor Circuit. 
 \
 \
5. Park/neutral position switch circuit. 
 




TRAC indicator light
abnormal.\
 
\


\

\

1. TRAC Indicator Light Circuit.
2. TRAC ECU. 




BR±224
 


TRAC OFF indicator
light abnormal.\
 
\

\

Only when 1. and 2. are all normal and the problem is still occurring, r\
e-
place the TRAC ECU. 


BR±222
 \
 \
1. TRAC OFF indicator Light Circuit. 
 \
 \
2. TRAC cut switch circuit. 
 








Diagnostic trouble
code check cannot
be performed.\
 
\


\


\


\

\

Only when 1. and 2. are all normal and the problem is still occurring, r\
e-
place the TRAC ECU.
1. TRAC Indicator Light Circuit.
2. Tc terminal Circuit. 








BR±224
BR±226
±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±173
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LOCATION OF CONNECTORS
Location of Connectors in Engine Compartment
SC300: BR±174
±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)
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SC400:
±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±175
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BR±176±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)
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Location of Connectors in Instrument Panel
SC300:
±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±177
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SC400:
BR±178±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)
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±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±179
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