1991 LEXUS SC400 Service Repair Manual

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Page 337 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG 2Check harness and connector between battery and No. 4 solenoid valve, No. 4 solenoid valve\ and ECM (See page IN±33). Repair or replace harness or connector. Proceed to next circuit inspectio

Page 338 of 4087

LEXUS SC400 1991 Service Repair Manual This sensor detects the rotation speed of the O/D input shaft from the rotation of the O/D direct clutch drum. Its construction is the same as that of the No. 2 vehicle speed sensor (See page AT±86)

Page 339 of 4087

LEXUS SC400 1991 Service Repair Manual AT±66 IN±33 WIRING DIAGRAM DIAGNOSTIC CHARTDIAGNOSTIC CHART ± A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTINGAT±99 WhereEverybodyKnowsYourName

Page 340 of 4087

LEXUS SC400 1991 Service Repair Manual NGNG OKNG INSPECTION PROCEDURE 1Check resistance between terminals NCO+ and NCO± of ECM connector. C OK PConnect the check harness A to the ECM (See EG sec- tion). Check resistance between terminal

Page 341 of 4087

LEXUS SC400 1991 Service Repair Manual ±MEMO± ± A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTINGAT±101 WhereEverybodyKnowsYourName

Page 342 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM AT±66 IN±33 Throttle Position Sensor Circuit CIRCUIT DESCRIPTION The throttle position sensor detects the throttle valve opening angle and s\ ends signals to ECM. DIAGNOSTIC CHARTDIA

Page 343 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG OKNG INSPECTION PROCEDURE 1Main throttle position signal check. C OK Hint PTurn ignition switch ON (Do not start the engine). Check voltage at the terminal T T of the DLC2 while grad- ually

Page 344 of 4087

LEXUS SC400 1991 Service Repair Manual AT±66 IN±33 WIRING DIAGRAM Kick±down Switch Circuit CIRCUIT DESCRIPTION The kick±down switch is turned on when the accelerator ped- al is depressed beyond the full throttle opening and sends sig-
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