1991 LEXUS SC400 Service Repair Manual

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Page 3545 of 4087

LEXUS SC400 1991 Service Repair Manual DIAGNOSTIC CHART DIAGNOSTIC CHART NG (NSW) Check for input signal. Proceed to next circuit inspection shown on maxtrix chart (See page TR±35). Check resistance of throttle position sensor. Check in

Page 3546 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG INSPECTION PROCEDURE 1Check output condition of diag. code 51. C OK Hint PSetting the test mode. (2) Turn ignition switch OFF. (2) Connect terminals TE2 and E1 and TDCL. (2) Turn ignition s

Page 3547 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK OKNG 3Disconnect A/C control assembly connector, check voltage between terminal MGC of A/C con- trol assembly connector and body ground. C OK P(2) Remove air conditioner control assembly. (2) Di

Page 3548 of 4087

LEXUS SC400 1991 Service Repair Manual ECU Power Source Circuit CIRCUIT DESCRIPTION When the ignition switch is turned on, battery voltage is applied to the terminal IGSW of the ECU, and the main relay control circuit in the ECU sends a s

Page 3549 of 4087

LEXUS SC400 1991 Service Repair Manual Check voltage of ECU power source. Check continuity between terminals E1 and body ground. Check voltage of terminal IGSW. Check IGN fuse. Check ignition switch. Check for open in harness and connecto

Page 3550 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 connec\ tor. C OK P1. Connect the Check Harness A. (See page TR±34) 2. Turn ignition switch

Page 3551 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 3552 of 4087

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