1991 LEXUS SC400 Service Repair Manual

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Page 945 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG INSPECTION PROCEDURES 1Check for open and short in harness and connector between terminal NEO of TRA\ C ECU and terminal NEO of ECM (See page IN±33). Repair or replace harness or connector

Page 946 of 4087

LEXUS SC400 1991 Service Repair Manual DTC45, 46Main Throttle Position Sensor Circuit CIRCUIT DESCRIPTION This circuit is not directly related to the TRAC control, but as it has an i\ nfluence on TRAC control when trouble occurs in this c

Page 947 of 4087

LEXUS SC400 1991 Service Repair Manual EG±608 or EG±388 ). EG±333 or EG±205 ). EG±609 or EG±389 ). EG±481). DIAGNOSTIC CHARTDIAGNOSTIC CHART ± BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±201 WhereEverybodyKnowsYourName

Page 948 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM BR±202± BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC) WhereEverybodyKnowsYourName

Page 949 of 4087

LEXUS SC400 1991 Service Repair Manual NOYES NGOK OKNG INSPECTION PROCEDURE 1Is diagnostic trouble code output for the engine? Perform diagnostic trouble code check on page EG±523 or EG±305 . Repair circuit indicated by the code output.

Page 950 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK NGOK 4Check voltage between terminal VTO1 of ECM and body ground with TRAC ECU connector dis- connected. C OK P1. Connect the Check Harness A. (See page EG±542 or EG±328 ). 2. Disconnect the

Page 951 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG NGOK 6Check for open and short in harness and connector between terminal VTA1 of ECM and main throttle position sensor (See page IN±33 ). Repair or replace harness or connector. Adjust or repla

Page 952 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK OKNG 8Check voltage between terminal IDL1 of TRAC ECU connector and body ground with TRAC ECU connector disconnected. C OK P1. Disconnect the TRAC ECU connector. 2. Turn ignition switch on. Mea
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