{"model":"mk4","model_name":"MK4 Supra","vehicle":"Toyota Supra A80 (1993–2002, 2JZ-GE / 2JZ-GTE)","document":"Repair Manual","section":"TGE","section_name":"Troubleshooting 2JZ-GE","page":65,"pages_in_section":105,"title":"Dtc 42 No.1 Vehicle Speed Sensor Signal Circuit","section_header":"Engine — 2JZ-GE Engine Troubleshooting","ocr_text":"EG-445\nENGINE — 2JZ-GE ENGINE TROUBLESHOOTING\n\nDTC 42 No.1 Vehicle Speed Sensor Signal Circuit\n\nCIRCUIT DESCRIPTION\nThe No.1 vehicle speed sensor outputs a 4-pulse signal for every revolution of the rotor shaft, which is\nrotated by the transmission output shaft via the driven gear. After this signal is converted into a more pre-\ncise rectangular waveform by the waveform shaping circuit inside the odometer and trip meter, it is then\ntransmitted to the engine control module. The ECM determines the vehicle speed based on the frequency\nof these pulse signals.\n\nA/T    4-pulse    4-pulse    ECM\nNo.1 Vehicle\nSpeed Sensor\nTelltale Light\nRH (Odometer\nand Trip Meter)\n\nNo.1 Vehicle Speed Sensor\n\nFI6643 FI6644\n\nDTC No.    Diagnostic Trouble Code Detecting Condition    Trouble Area\n\n42\nFor A/T\nAll conditions below are detected\ncontinuously for 8 sec. or more:\n(a) No.1 vehicle speed signal: 0 km/h\n(mph)\n(b) Engine speed: 3,000 rpm or more\n(c) Park/neutral position switch: OFF\n(d) Stop light switch: OFF\n\nFor A/T\nAll conditions below are detected\ncontinuously for 8 sec. or more:\n(a) No.1 vehicle speed signal: 0 km/h\n(mph)\n(b) Engine speed: Between 2,000 rpm\nand 5,000 rpm\n(c) Engine coolant temp.: 80°C (176°F)\nor more\n(d) Load driving\n\n• No.1 Vehicle speed sensor\n• Telltale light RH (Odometer and trip meter)\n• Open or short in No.1 vehicle speed sensor\ncircuit\n• ECM\n\nHINT: In test mode, diagnostic trouble code 42 is output when vehicle speed is 5 km/h (3 mph) or\nbelow.\n\nReference\n\n2 V/Div.\n\n20 msec./Division\n\n• Waveform between terminals SP1 and E1 when vehicle\nspeed is approx. 20 km/h (12mph).\nHINT: As the vehicle speed increases, the number of sig-\nnals from SP1 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transcript of a scanned Toyota factory manual page; verify critical values (torque specs, part numbers) against the image."}