1991 LEXUS SC400 Service Repair Manual

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Page 2745 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK OKNG INSPECTION PROCEDURE 1Check voltage between terminals #20 ~ 40 of engine & ECT ECU and body ground.\ C OK P(2) Connect the Check Harness A.(See page TR±30) (2) Turn ignition switch on. M

Page 2746 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG OKNG 3Check for open in harness and connector between terminal E01, E02 of eng\ ine & ECT ECU con- nector and body ground (See page IN±27). Repair or replace harness or connector. 4Check

Page 2747 of 4087

LEXUS SC400 1991 Service Repair Manual Cold Start Injector Circuit CIRCUIT DESCRIPTION The cold start injector is used to maintain the engine startability when it\ is cold. The injection volume, i,e, the length of time the injector is en

Page 2748 of 4087

LEXUS SC400 1991 Service Repair Manual DIAGNOSTIC CHART DIAGNOSTIC CHART Check voltage of cold start injector power source. Check cold start injector. Check start injector time switch.Replace start injector time switch. Repair or replace

Page 2749 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK OKNG INSPECTION PROCEDURE 1Check voltage between terminal STJ of engine & ECT ECU connector and body gro\ und. C OK Hint PConnect to the Check Harness A. (See page TR±30) Disconnect start injec

Page 2750 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG OKNG 3Check start injector time switch. C OK PRemove start injector time switch (See page FI±88). Measure resistance between terminals shown below. Replace start injector time switch. 4Che

Page 2751 of 4087

LEXUS SC400 1991 Service Repair Manual ISC Valve Circuit CIRCUIT DESCRIPTION The ISC valve is provided on the intake air chamber and in- take air bypassing the throttle valve is directed to the ISC valve through a hose. A step motor is bu

Page 2752 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG INSPECTION PROCEDURE 1Check ISC value. C OK P P OK C Disconnect ISC connector. Measure resistance between terminals shown below. Remove ISC Valve (2) Connect the battery positive lead to t
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