1991 LEXUS SC400 Service Repair Manual

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Page 2737 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK OKNG NGOK INSPECTION PROCEDURE 1Check voltage between terminals + B, + B1 and E1 of engine & ECT ECU connecto\ r. C OK P(2) Connect the Check Harness A.(See page TR±30) (2) Turn ignition switc

Page 2738 of 4087

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

Page 2739 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG 6Check voltage between terminal M±REL of engine & ECT ECU connector and bod\ y ground. C OK PTurn ignition switch on. Measure voltage between terminal M±REL of engine & ECT ECU connection

Page 2740 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG 8Check EFI main relay. C OK P C OK Remove EFI main relay. Check continuity between terminals of EFI main relay shown below. (2) Apply battery voltage between terminals 1 and 3. (2) Check co

Page 2741 of 4087

LEXUS SC400 1991 Service Repair Manual Back Up Power Source Circuit CIRCUIT DESCRIPTION Battery voltage is supplied to terminal BATT of the ECU even when the ignition switch is off for use by the diagnostic code memory and air±fuel ratio

Page 2742 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG YESNO INSPECTION PROCEDURE 1Check EFI fuse. C OK PRemove EFI fuse from R/B No.2. Check continuity of EFI fuse. Continuity Check for short in all the harness and components con- nected to EF

Page 2743 of 4087

LEXUS SC400 1991 Service Repair Manual Injector Circuit CIRCUIT DESCRIPTION The injectors are provided to the intake manifold. They inject fuel into th\ e cylinders based on the signals from the engine & ECT ECU. DIAGNOSTIC CHARTDIAGNOSTI

Page 2744 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM ± ENGINE TROUBLESHOOTING Circuit InspectionTR±133 WhereEverybodyKnowsYourName
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