Lexus SC300 / Lexus SC400. Manual — part 80
J/B No. 1
AT–76
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A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
–MEMO–
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A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
AT–77
CIRCUIT INSPECTION
DTC
42
No. 1 Vehicle Speed Sensor Circuit
(Backup Sensor)
CIRCUIT DESCRIPTION
The No. 1 vehicle speed sensor outputs a 4–pulse signal for every revolution of the transmission output shaft.
After this signal is converted in to a more precise rectangular wave form by the wave form shaping circuit inside
the combination meter, it is then transmitted to the ECM.
DTC No.
DTC Detecting Condition
Trouble Area
42
All conditions below are detected 500 times or ore con-
tinuously:
2 trip detection logic*
(a) No.1 vehicle speed sensor signal in 16 No 2 vehicle
sensor signal
(b) Vehicle speed: 5.6 MPH (9km/h) or more for at
least 4 secs. or more
(c) Park/neutral position switch:
OFF (Other than P or N position)
No. 1 vehicle speed sensor.
Combination meter.
Harness or connector between No. 1 vehicle
speed sensor and ECM.
ECM
*: See page AT–62
Reference
Wave form between terminals SPD and E1 when vehicle speed is approx. 37 MPH (60km/h).
HINT: The greater the vehicle speed, the greater the number of SPD signals produced.
AT–78
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A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
WIRING DIAGRAM
combination meter
AT–66
combination meter
DIAGNOSTIC CHART
DIAGNOSTIC CHART
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A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
AT–79
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