{"model":"mk4","model_name":"MK4 Supra","vehicle":"Toyota Supra A80 (1993–2002, 2JZ-GE / 2JZ-GTE)","document":"Repair Manual","section":"TGTE","section_name":"Troubleshooting 2JZ-GTE","page":85,"pages_in_section":113,"title":"Dtc 51 Switch Condition Signal Circuit","section_header":"Engine — 2JZ-GTE Engine Troubleshooting","ocr_text":"DTC 51 Switch Condition Signal Circuit\n\nCIRCUIT DESCRIPTION\n\nPark/Neutral Position Switch\nThe ECM uses the signals from the park/neutral position switch to determine whether the transmission is in park or neutral, or in some other position.\n\nAir Conditioning Switch Signal\nThe ECM uses the output from the air conditioning switch to determine whether or not the air conditioning is operating so that it can increase the idling speed of the engine if necessary.\n\nThrottle Position Sensor IDL Signal\nThe IDL contacts are mounted in the throttle position sensor, and detects the idle condition.\n\nDTC No. | Diagnostic Trouble Code Detecting Condition | Trouble Area\n51 | (1) 3 sec. or more after engine starts with closed throttle position switch OFF (IDL1)\n(2) Park/neutral position switch: OFF (Shift position in \"R\", \"D\", \"2\" or \"1\" position.)\n(3) A/C switch ON | • Throttle position sensor IDL circuit\n• Accelerator pedal and cable\n• Park/neutral position switch\n• A/C switch circuit\n• ECM\n\nHINT: In this circuit, diagnosis can only be made in the test mode.\n\nWIRING DIAGRAM\n\nEngine Control Module\nB+\n76 NSW\nE9\n\n7 B B-W 6 ST 4 B 13 B-W B-W\n1J 1K J2\nIgnition Switch\nJ/B No.1\n\nB-W\n6\nPark/Neutral\nPosition\nSwitch\n5\n\n4 1J\nJ/B No.1\n4 1B\n\nB B 3 B\nEA1\n\nB+\n2 2 2\n5 1 1 EA2 1 W-L 4 SW6 MGC 6 L-R 31 L-R 34 A/C\nH13 A14 A14 I11 E10\n\nStarter Relay\nB\nA/C Amplifier\n\nB+\n3 2 S3 1\nHeater Control\nSwitch\nStarter\n\nIDL\n64\nE9\n\nJ/B No.2\n\n4 3 R\nThrottle\nPosition\nSensor\n\nALT\nMAIN\n1 2A 2\n\nB\n\n1 L-O 8 L-O 10 L-O 25 4 W-B BR-B 65 E2\nB3 F2 T13 T7 E9\n\nBattery\nTheft Deterrent\nand Door Lock\nControl 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transcript of a scanned Toyota factory manual page; verify critical values (torque specs, part numbers) against the image."}