1991 LEXUS SC400 Service Repair Manual

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Page 937 of 4087

LEXUS SC400 1991 Service Repair Manual BR±120 WIRING DIAGRAM DIAGNOSTIC CHARTDIAGNOSTIC CHART ± BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±191 WhereEverybodyKnowsYourName

Page 938 of 4087

LEXUS SC400 1991 Service Repair Manual IN±33). WIRING DIAGRAM DTC41IG Power Source Circuit CIRCUIT DESCRIPTION This is the power source for the ECU and becomes power source for the CPU an\ d actuators. DTC No.DTC Detecting ConditionTroub

Page 939 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG NGOK OKNG INSPECTION PROCEDURE 1Check battery positive voltage. Voltage: 10 ± 14 VCOK Check and repair the charging system. 2Check voltage between terminals IG and GND of TRAC ECU connector. C

Page 940 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG 4Check ECU±IG fuse. C OK PRemove ECU±IG fuse from J/B No. 1. Check continuity of ECU±IG fuse. Continuity Check for short in all the harness and components con- nected to ECU±IG fuse (See att

Page 941 of 4087

LEXUS SC400 1991 Service Repair Manual ±MEMO± ± BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±195 WhereEverybodyKnowsYourName

Page 942 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM DTC43ABS & TRAC ECU Malfunction CIRCUIT DESCRIPTION DTC No.DTC Detecting ConditionTrouble Area 43ABS control system or TRAC (BRAKE) control system or communication circuit is abnormal.

Page 943 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK NGOK OKNG INSPECTION PROCEDURE 1Check voltage between terminal BRFA of TRAC ECU and body ground. C OK P1. Remove TRAC ECU with connectors still con-nected. 2. Turn ignition switch ON. Measure vo

Page 944 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM DTC44NE Signal Circuit CIRCUIT DESCRIPTION The TRAC ECU receives engine speed signals (NE signals) from the ECM. DTC No.DTC Detecting ConditionTrouble Area 44No signal is input to term
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