1991 LEXUS SC400 Service Repair Manual

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Page 3737 of 4087

LEXUS SC400 1991 Service Repair Manual CIRCUIT DESCRIPTION (Contd) DIAGNOSIS TROUBLE CODE DETECTION DRIVING PATTERN Purpose of the driving pattern. (a) To simulate diag. trouble code detecting condition after diag. trouble co\ de is re

Page 3738 of 4087

LEXUS SC400 1991 Service Repair Manual DIAGNOSTIC CHART Check voltage of VSV for EGR Power source. Check resistance of VSV for EGR. Repair or replace harness or connector. Replace VSV for EGR. Check for open and short in harness and conne

Page 3739 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM ± ENGINE TROUBLESHOOTING Circuit InspectionTR±107 WhereEverybodyKnowsYourName

Page 3740 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK OKNG OKNG INSPECTION PROCEDURE 1Check voltage between terminal EGR of ECM connector and body ground. C OK P1. Connect the Check Harness A. (See page TR±34). 2. Warm up engine to normal operati

Page 3741 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG OKNG 4Check EGR system (See page EC±12). Repair EGR system. 5Check resistance of EGR gas temp. sensor. C OK PRemove EGR gas temp. sensor. Measure resistance between terminals of EGR gas te

Page 3742 of 4087

LEXUS SC400 1991 Service Repair Manual Diag. Code 71 EGR System Malfunction (Only for USA spec.) CIRCUIT DESCRIPTION The EGR system recirculates exhaust gas, which is controlled to the proper quantity to suit the driv\ ing condi- tions,

Page 3743 of 4087

LEXUS SC400 1991 Service Repair Manual CIRCUIT DESCRIPTION (Contd) DIAGNOSIS CODE DETECTION DRIVING PATTERN Purpose of the driving pattern. (a) To simulate diag. code detecting condition after diag. code is recorded. (b) To check that

Page 3744 of 4087

LEXUS SC400 1991 Service Repair Manual DIAGNOSTIC CHART WIRING DIAGRAM Check voltage of terminal EGR 1 ~ 4. Check voltage of EGR Step motor power source. Check resistance of EGR step motor. Check for open and short in harness and connecto
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