{"model":"mk4","model_name":"MK4 Supra","vehicle":"Toyota Supra A80 (1993–2002, 2JZ-GE / 2JZ-GTE)","document":"Repair Manual","section":"ATGE","section_name":"A340 Automatic Trans (GE)","page":66,"pages_in_section":98,"title":"Dtc 42 No. 1 Vehicle Speed Sensor Signal Circuit","section_header":"AT340E (2JZ–GE) Automatic Transmission – Troubleshooting","ocr_text":"AT1–66\nAT340E (2JZ–GE) AUTOMATIC TRANSMISSION – TROUBLESHOOTING\n\nDTC 42 No. 1 Vehicle Speed Sensor Signal Circuit\nCIRCUIT DESCRIPTION\n\nThe No. 1 vehicle speed sensor outputs a 4–pulse signal for every revolution of the rotor shaft, which is rotated by the transmission output shaft via the driven gear. After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted to the ECM. The ECM determines the vehicle speed based on the frequency of these pulse signals.\n\nA/T    4-pulse    4-pulse    ECM\nNo.1 Vehicle Speed Sensor    Telltale Light RH\n\nDriven Gear\nDrive Gear\nTransmission Output Shaft\nNo.1 Vehicle Speed Sensor\n\nFI6643 FI6644\n\nDTC No. | Diagnostic Trouble Code Detection Condition | Trouble Area\n\n42\nAll conditions below are detected 500 times or more continuously. (2 trip detection logic)*\n(a) No. No. 1 vehicle speed sensor signal in 16 pulses of No. 2 vehicle speed sensor signal.\n(b) Vehicle speed: 9 km/h (5.6 mph) or more for 4 secs. or more for 4 secs. or more.\n(c) Park/neutral position switch: OFF (Other than P or N position)\n\n• No. 1 vehicle speed sensor\n• Telltale light RH\n• Harness or connector between No. 1 vehicle speed sensor and ECM\n• ECM\n\n*: See page AT1–54\n\nHINT: In test more, diagnostic trouble code 42 is output when vehicle speed is 5 km/h (3 mph) or below.\n\n< Reference >\n• Waveform between terminals SP1 and E2 when vehicle speed is approx. 20 km/h (12 mph).\n\n2 V/div\n20 msec./division\n\nV01496\n\nHINT: As the vehicle's speed increases, the signal output from SP1 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