{"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":72,"pages_in_section":118,"title":"Dtc 42 No.1 Vehicle Speed Sensor Signal Circuit","section_header":"A340E (2JZ—GTE) Automatic Transmission — Troubleshooting","ocr_text":"AT2–72\nA340E (2JZ—GTE) AUTOMATIC TRANSMISSION – TROUBLESHOOTING\n\nDTC 42 No.1 Vehicle Speed Sensor Signal Circuit\n\nCIRCUIT DESCRIPTION\n\nThe No. 1 vehicle speed sensor outputs a 4–pulse signal for every revolution of the rotor shaft, which\nis rotated by the transmission output shaft via the driven gear. After this signal is converted into a more\nprecise rectangular waveform by the waveform shaping circuit inside the combination meter, it is then\ntransmitted to the engine control module. The ECM determines the vehicle speed based on the fre-\nquency of these pulse signals.\n\nTransmission\nOutput Shaft\n\nA/T    4-pulse    4-pulse    ECM\n\nRotor Shaft\n\nNo.1 Vehicle\nSpeed Sensor    Telltale Light\nRH\n\nDriven Gear\n\nNo.1 Vehicle Speed Sensor\n\nFI6643 Q04361\n\nDTC No.    Diagnostic Trouble Code Detection Condition    Trouble Area\n\n42\nAll conditions below are detected for 4 secs. or\nmore. (2 trips detection logic)*\n(a) No No.1 vehicle speed sensor signal in 16\n    pulses of No.2 vehicle speed sensor signal.\n(b) Vehicle speed: 9 km/h (5.6 mph) or more\n(c) Park/neutral position switch:\n    OFF (Other than P or N position)\nNo. 1 vehicle Speed sensor\nTelltale light RH\nHarness or connector between No. 1 vehicle\nspeed sensor and ECM\nECM\n\n* See page AT2–58\n\nHINT: In test mode, diagnostic trouble code 42 is output when vehicle speed is 5 km/h (3 mph) or\n      below.\n\n<Reference>\n  Waveform between terminals SP1 and E2 when vehicle speed is approx. 20 km/h (12 mph).\n\nHINT: As the vehicle's speed increases, the signal output from\n      SP1 increases.\n\n2 V/div\n\n20 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transcript of a scanned Toyota factory manual page; verify critical values (torque specs, part numbers) against the image."}