EG–556 ENGINE – 2JZ–GTE ENGINE TROUBLESHOOTING DTC 42 No. 1 Vehicle Speed Sensor Signal Circuit CIRCUIT DESCRIPTION The 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 odometer and trip meter, it is then transmitted to the engine control module. The ECM determines the vehicle speed based on the frequency of these pulse signals. A/T 4-pulse 4-pulse ECM No. 1 Vehicle Speed Sensor Telltale Light RH (Odometer and Trip Meter) Transmission Output Shaft Driven Gear No. 1 Vehicle Speed Sensor FI6643 Q04361 DTC No. | Diagnostic Trouble Code Detecting Condition | Trouble Area 42 For A/T All conditions below are detected Continuously for 8 sec. or more: (a) No.1 vehicle speed signal: 0 km/h (mph) (b) Engine speed: 3,000 rpm or more (c) Park/neutral position switch: OFF (d) Stop light switch: OFF For A/T All conditions below are detected Continuously for 8 sec. or more: (a) No.1 vehicle speed signal: 0 km/h (mph) (b) Engine speed: Between 1,500 rpm and 4,000 rpm (c) Engine coolant temp.: 80°C (176°F) or more (d) Load driving • No.1 vehicle speed sensor • Telltale light RH (Odometer and trip meter) • Open or short in No.1 vehicle speed sensor circuit • ECM HINT: In test mode, diagnostic trouble code 42 is output when vehicle speed is 5 km/h (3 mph) or below. Reference 2 V/Div. 20 msec./Division VG1496 • Waveform between terminals SP1 and E1 when vehicle speed is approx. 20 km/h (12mph). HINT: As the vehicle speed increases, the number of signals from SP1 increases.