1991 LEXUS SC400 Service Repair Manual

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Page 961 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG 10Check sub±throttle position sensor (See page EG±609 or EG±389 ). Adjust or replace sub±throttle position sensor (See page EG±333 or EG±205 ). Check and replace ECM. ± BRAKE SYSTEM TRA

Page 962 of 4087

LEXUS SC400 1991 Service Repair Manual IN±29). WIRING DIAGRAM DTC49Engine Communication Circuit CIRCUIT DESCRIPTION This circuit is used to send ignition timing retard request signals from the TRAC ECU to\ the ECM in order to retard th

Page 963 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK OKNG INSPECTION PROCEDURE 1Check voltage between terminal TR2 of TRAC ECU and body ground. C OK Hint P1. Disconnect TRAC ECU connector. 2. Turn ignition switch on. Measure voltage between termin

Page 964 of 4087

LEXUS SC400 1991 Service Repair Manual TR±11 WIRING DIAGRAM DTC51Engine Malfunction Detection Circuit CIRCUIT DESCRIPTION If trouble (trouble which causes the malfunction indicator light to light\ up) occurs in the engine control system

Page 965 of 4087

LEXUS SC400 1991 Service Repair Manual ±MEMO± ± BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±219 WhereEverybodyKnowsYourName

Page 966 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM DTC61ABS & TRAC ECU Communication Circuit Malfunction CIRCUIT DESCRIPTION DTC No.DTC Detecting ConditionTrouble Area 61Malfunction in ABS & TRAC ECU communication cir- cuit. Open or sh

Page 967 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG NGOK OKNG INSPECTION PROCEDURE 1Check voltage between terminals ABSO, BRC, BRP of TRAC ECU and body ground. C OK Hint PRemove TRAC ECU with connectors still connected. Measure voltage between te

Page 968 of 4087

LEXUS SC400 1991 Service Repair Manual TRAC OFF Indicator, TRAC Cut Switch Circuit CIRCUIT DESCRIPTION This is the TRAC control main switch. When the TRAC cut switch is pushed on,\ TRAC control goes off and the TRAC OFF indicator lights
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