{"model":"mk4","model_name":"MK4 Supra","vehicle":"Toyota Supra A80 (1993–2002, 2JZ-GE / 2JZ-GTE)","document":"Repair Manual","section":"ATTE","section_name":"A340 Automatic Trans (GTE)","page":75,"pages_in_section":118,"title":"Dtc 46 No.4 Solenoid Valve Circuit (For Accumulator Back Pressure Modulation)","section_header":"A340E (2JZ—GTE) Automatic Transmission — Troubleshooting","ocr_text":"AT2–75\n\nA340E (2JZ—GTE) AUTOMATIC TRANSMISSION – TROUBLESHOOTING\n\nDTC 46 No.4 Solenoid Valve Circuit (For Accumulator Back Pressure Modulation)\n\nCIRCUIT DESCRIPTION\n\nThe No.4 solenoid valve controls the hydraulic pressure acting on\nthe brakes and clutches of the planetary gear units when gears are\nshifted and performs smooth gear shifting.\nThe ECM determines optimum operating pressure according to\nthe signals from the throttle position sensor, vehicle speed sensor\nand O/D clutch speed sensor and controls the volume of current\nflow to the solenoid valve.\nThe amount of electric current to the solenoid is controlled by the\n(*) duty ratio of ECM output signals, causing momentary change\nto the hydraulic pressure acting on the clutches during gear shift-\ning. When the duty ratio is high, the hydraulic pressure acting on\nthe clutches is now.\n(*) Duty Ratio\nThe duty ratio is the ratio of the period of continuity in one cycle.\nFor example, if A is the period of continuity in one cycle, and B is the period of non–continuity, then\n\nDuty Ratio = A / (A + B) × 100 (%)\n\nON\nA\nB\nOFF\n1 cycle\nBE4056\n\nLock–up\noperation\npressure\n\nCurrent flow to\nsolenoid\n\nDTC No. | Diagnostic Trouble Code Detection Condition | Trouble Area\n\n46 | All conditions below are detected for 1 sec. or\nmore. (2 trips detection logic)*\n(a) ECM outputs duty signal to No.4 solenoid in\n90% or higher duty ratio.\n(b) Current to No.4 solenoid:\n330 ± 100 mA or less\n(O/D OFF indicator light doesn't blink) | No. 4 solenoid valve\nHarness or connector between No.4\nsolenoid valve and ECM\nECM\n\n* See page AT2–58\n\n<Reference>\nWaveform between terminals SLN\nand E1 when engine is idling.\n\nAT8764\n5 V/div.\nGND\n1 msec./division\n\nWaveform between terminals SLN\nand E1 during shift change.\n\nAT8766\n5 V/div.\nGND\n1 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transcript of a scanned Toyota factory manual page; verify critical values (torque specs, part numbers) against the image."}