Lexus SC300 / Lexus SC400. Service manual — part 86
–MEMO–
–
A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
AT–101
![](/vehicle/tus/kendre/chaul/sou.png)
WIRING DIAGRAM
AT–66
IN–33
Throttle Position Sensor Circuit
CIRCUIT DESCRIPTION
The throttle position sensor detects the throttle valve opening angle and sends signals to ECM.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
AT–102
–
A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
![](/vehicle/tus/kendre/chaul/zest.png)
OK
NG
OK
NG
OK
NG
INSPECTION PROCEDURE
1
Main throttle position signal check.
C
OK
Hint
P
Turn ignition switch ON (Do not start the engine).
Check voltage at the terminal T
T
of the DLC2 while grad-
ually depressing the accelerator pedal from the fully
closed position to the fully opened position.
Voltage changes from 0 V to 8 V by stages.
Do not depress the brake pedal during this test. The
voltage will stay at 0 V if depressed.
Proceed to next circuit inspection shown on matrix chart
(See page AT–66).
2
Check throttle position sensor.
See engine troubleshooting section in EG section.
Replace throttle position sensor.
3
Check harness and connector between ECM and throttle position sensor (See page IN–33).
Repair or replace harness or connector.
Check and replace ECM.
–
A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
AT–103
![](/vehicle/tus/kendre/chaul/zimererey.png)
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 CHART
DIAGNOSTIC CHART
AT–104
–
A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
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