Page 465 of 2543
Kick±down Switch Circuit
CIRCUIT DESCRIPTION
The kick±down switch is turned on when the accelerator pedal
is depressed beyond the full throttle opening and sends signals
to 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 dis-
regards the kick±down signals and controls shifting at the nor-
mal shift points.
WIRING DIAGRAM
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT1±79
Page 466 of 2543
Connect the Check Harness A to the ECM
(See page EG±404).
Turn ignition switch ON.
Check voltage between terminal KD of ECM connector and body ground.
Measure voltage between terminal KD of ECM
connector and body ground when accel. pedal is
fully depressed or not.
Proceed to next circuit inspection shown on
matrix chart (See page AT1±58).
Released
(Kick±down SW is OFF)
Fully depressed
(Kick±down SW is ON)
Accel. pedalVoltage
9 ± 14 V
Below 3 V
Check kick±down switch.
Disconnect kick±down switch connector (See
page AT1±15).
Measure voltage between terminals 1 and 2 of
kick±down switch connector when kick±down
switch is on and off.
Kick±down switch
ON
OFF
Resistance
C (continuity)
8 (open)
Replace kick±down switch.
Check harness and connector between ECM and kick±down switch, kick±
down switch and body ground (See page IN±30).
Repair or replace harness connector.
Check and replace ECM.
INSPECTION PROCEDURE
AT1±80± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING
Page 467 of 2543
Park Neutral Position Switch Circuit
CIRCUIT DESCRIPTION
The park/neutral position switch detects the shift lever position and sends signals to ECM.
The ECM receives signals (NSW, 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.
WIRING DIAGRAM
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT1±81
Page 468 of 2543
Connect the Check Harness A to the ECM
(See page EG±404).
Turn ignition switch ON.
Check voltage between terminals NSW, 2, L of ECM connector and body
ground.
Measure voltage between terminals NSW, 2, L of
ECM connector and body ground when the shift
lever is positioned to the following positions.
Proceed to next circuit inspection shown on
matrix chart (See page AT1±58).
Check park/neutral position switch.
Jack up the vehicle.
Remove park/neutral position switch (See
page AT1±15).
Replace park/neutral position switch.
Check harness and connector between battery and park/neutral position
switch, park/neutral position switch and ECM (See page IN±30).
Repair or replace harness and connector.
Check and replace ECM.
Check continuity between each terminal shown
below when the shift lever is positioned to each
position.
The voltage will drop slighty due to lighting up of the
back up light.
INSPECTION PROCEDURE
AT1±82± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING
Page 469 of 2543
See
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
The purpose of this circuit is to prevent the engine from stalling, while driving in lock±up 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
lock±up clutch while braking is in progress.
WIRING DIAGRAM
INSPECTION PROCEDURE
Check operation of stop light.
Check and repair stop light circuit.
Check if the stop lights go on and off normally when the brake pedal is depressed and
released.
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT1±83
Page 470 of 2543
Connect a voltmeter to the terminals TT and
E1 of the DLC2.
Turn ignition switch ON (Do not start the en-
gine).
Fully depress the accelerator pedal until the
voltmeter indicates 8 V and hold it.
Depress and release the brake pedal and
check the voltage.
Check stop light signal.
Brake pedal
Proceed to next circuit inspection shown on
matrix chart (See page AT1±58).
Check harness and connector between ECM and stop light switch
(See page IN±30).
Repair or replace harness or connector
Voltage
Depressed0 V
Released8 V
Check and replace ECM. AT1±84
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING
Page 471 of 2543
Pattern Select Switch Circuit
CIRCUIT DESCRIPTION
The ECM memory contains the shift programs for the NORMAL and MANUAL patterns, 2 position, and L posi-
tion and the lock±up patterns. Following the programs corresponding to the signals from the pattern select
switch, the park/neutral position switch and other various sensors the ECM switches the solenoid valves ON
and OFF, thereby controlling the transmission gear change and the lock±up clutch operation.
WIRING DIAGRAM
INSPECTION PROCEDURE
Check A/T fluid temp. sensor. (See page AT1±64).
Replace A/T fluid temp. sensor.
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT1±85
Page 472 of 2543

Turn ignition siwtch ON.
Check ªMANUº mode indicator light when pat-
tern select switch is pushed in to ON.
Check if A/T fluid is too hot.
Pattern select switch
Connect the Check Harness A to the ECM
(See page EG±404).
Turn igntion switcn ON.
Check voltage between terminal M of ECM connector and body ground.
Proceed to next circuit inspection shown on
matrix chart. (See page AT1±58)
Voltage
MANU7.5 ± 14 V
NORMBelow 1.5 V
Wait until the A/T fluid temp. is reduced.
The ECM uses the Normal pattern signal if the
Manual signal is not input.
Measure voltage between the terminal M of ECM
connector and body ground when the pattern se-
lect switch is set to the MANU (MANUAL) position
and NORM (NORMAL) position.
ºMANUº mode indicator light comes on and stays
on.
If the A/T fluid temp. becomes too hot, the
ªMANUº mode indicator light flashes for several
seconds and goes off. The driving mode then
automatically changes from MANU mode to the
NORM mode. AT1±86
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING