1991 LEXUS SC400 Service Repair Manual

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Page 913 of 4087

LEXUS SC400 1991 Service Repair Manual
BR±168BR±170
BR±172 BR±228
BR±170
BR±172
BR±186 ~ BR±226 BR±170IN±22
±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±167
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Page 914 of 4087

LEXUS SC400 1991 Service Repair Manual
CUSTOMER PROBLEM ANALYSIS CHECK SHEET
BR±168±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)
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Page 915 of 4087

LEXUS SC400 1991 Service Repair Manual
MEMO±
±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±169
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Page 916 of 4087

LEXUS SC400 1991 Service Repair Manual
DIAGNOSIS SYSTEM
INDICATOR CHECK
When the ignition switch is turned on, check that the TRAC
indicator light goes on for 3 seconds.
HINT: If the indicator check result is not normal, proceed to
troubl

Page 917 of 4087

LEXUS SC400 1991 Service Repair Manual
DIAGNOSTIC TROUBLE CODE
CLEARANCE
1. Using SST, connect terminals Tc and E1 of DLC2 or DLC1.SST 09843±18020
2. IG switch ON.
3. Clear the diagnostic trouble codes stored in ECU by depressing th

Page 918 of 4087

$LEXUS SC400 1991 Service Repair Manual DIAGNOSTIC TROUBLE CODE CHART If a malfunction code is displayed during the diagnostic trouble code chec\ k, check the circuit listed for that code in the table below and proceed to the page given. H$

Page 919 of 4087

$LEXUS SC400 1991 Service Repair Manual PROBLEM SYMPTOMS CHART If a normal code is displayed during the diagnostic trouble code check but\ the problem still occurs, check the circuits for each problem symptom in the order given in the tab$

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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Page 920 of 4087

LEXUS SC400 1991 Service Repair Manual
LOCATION OF CONNECTORS
Location of Connectors in Engine Compartment
SC300: BR±174
±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)
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