1991 LEXUS SC400 diagram

IN±33AT±66
WIRING DIAGRAM
DIAGNOSTIC CHARTDIAGNOSTIC CHART
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTINGAT±87
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AT±66IN±33
WIRING DIAGRAM
DIAGNOSTIC CHARTDIAGNOSTIC CHART
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTINGAT±91
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AT±66
IN±33
WIRING DIAGRAM
DIAGNOSTIC CHARTDIAGNOSTIC CHART
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTINGAT±95
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AT±66
IN±33
WIRING DIAGRAM
DIAGNOSTIC CHARTDIAGNOSTIC CHART
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTINGAT±99
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WIRING DIAGRAM
AT±66
IN±33
Throttle Position Sensor Circuit
CIRCUIT DESCRIPTION
The throttle position sensor detects the throttle valve opening angle and s\
ends signals to ECM.
DIAGNOSTIC CHARTDIAGNOSTIC CHART
AT±102±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTING
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AT±66
IN±33
WIRING DIAGRAM
Kick±down Switch Circuit
CIRCUIT DESCRIPTION
The kick±down switch is turned on when the accelerator ped-
al is depressed beyond the full throttle opening and sends sig-
nals to the ECM.
When the kick±down switch is turned on, the ECM controls
gear shifting according to the programmed shift diagrams.
If a short circuit develops in the kick±down switch, the ECM
disregards the kick±down signals and controls shifting at the
normal shift points.
DIAGNOSTIC CHARTDIAGNOSTIC CHART
AT±104±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTING
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The park/neutral position switch detects the shift lever
position and sends signals to ECM.The ECM receives
signals (R, PNP, 2 and L) from the park/neutral position
switch. When the signal is not sent to the ECM from the
park/neutral position switch, the ECM judges that the
shift lever is in the D position.
AT±66
IN±33
WIRING DIAGRAM
Park/neutral Position Switch Circuit
CIRCUIT DESCRIPTION
DIAGNOSTIC CHARTDIAGNOSTIC CHART
AT±106±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTING
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AT±66BE
IN±33
WIRING DIAGRAM
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
The purpose of this circuit is to prevent the engine from stalling, while d\
riving in lockup condition, when
brakes are suddenly applied.When the brake pedal is operated, this switch sends a signal to ECM. Then
the ECM cancels operation of the lockup clutch while braking is in progress\
.
DIAGNOSTIC CHARTDIAGNOSTIC CHART
AT±108±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTING
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