Page 585 of 2543
Park Neutral Position Switch Circuit
CIRCUIT DESCRIPTION
The park/neutral position switch detects the shift lever position and sends signal to ECM.
The ECM receives signals (R, 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.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±101
Page 586 of 2543

Check voltage between terminals R, NSW, 2, L of ECM connector and body
ground.
1. Connect the Check Harness A to the ECM
(See page EG±510).
2. Turn ignition switch ON.
Measure voltage between terminals R, NSW, 2, L of
the Check Harness A connector and body ground
when the shift lever is positioned to the following
ranges.
Proceed to next circuit inspection shown on
matrix chart (See page AT2±64).
*: The voltage will drop slightly due to lighting up of
the back up light.
Check harness and connector between battery and park/neutral position
switch, park/neutral position switch and ECM (See page IN±30).
Check park/neutral position switch.
Replace the park/neutral position switch.
Repair or replace harness and connector.
Check and replace ECM.
1. Jack up the vehicle.
2. Remove the park/neutral position switch (See
page AT2±17).
Check continuity between each terminal shown be-
low when the shift lever is positioned to each posi-
tion.
INSPECTION PROCEDURE
AT2±102± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING
Page 587 of 2543
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 the ECM. Then the ECM cancels operation
of the lock±up clutch while braking is in progress.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±103
Page 588 of 2543
Depressed
Released
Brake pedalVoltage
0 V
8 V
Check stop light signal.
1. Connect the voltmeter to the terminals TT and
E1 of the DLC2.
2. Turn ignition switch ON.
3. Fully depress the accelerator pedal until the
voltmeter indicates 8 V and hold it.
4. Depress and release the brake pedal and
check the voltage.
Proceed to next circuit inspection shown on
matrix chart (See page AT2±64).
Check operation of stop light.
Repair or replace harness or connector.
Check and replace ECM.
Check harness and connector between ECM and stop light switch (See page
IN±30).
Check and repair stop light circuit.
Check if the stop lights go on and off normally when the brake pedal is depressed and released.
INSPECTION PROCEDURE
AT2±104± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING
Page 589 of 2543
Pattern Select Switch Circuit
CIRCUIT DESCRIPTION
The ECM memory contains the shift programs for the NORMAL and MANUAL patterns, 2 position, 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.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±105
Page 590 of 2543

Check if A/T fluid temp. is too hot.
1. Turn ignition switch ON.
2. Check ªMANUº mode indicator light when pat-
tern select switch is pushed in to ON.
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 Manual mode to the Normal mode.
Measure voltage between the terminal M of the
ECM connector and body ground when the pattern
select switch is set to the MANU (MANUAL) posi-
tion and NORM (NORMAL) position.
Check A/T fluid temp. sensor (See page AT2±70).
Check voltage between terminal M of ECM connector and body ground.
Replaces A/T fluid temp. sensor.
1. Connect the Check Harness A to the ECM
(See page EG±510).
2. Turn ignition switch ON.
Proceed to next circuit inspection shown on
matrix chart (See page AT2±64).
The ECM uses the Normal pattern signal if the
Manual signal is not input.
Pattern select switchVoltage
MANU
NORM
10 Ð 14 V
Below 1 V
Go to step.
Wait until the A/T fluid temp. is reduced.
INSPECTION PROCEDURE
AT2±106± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING
Page 591 of 2543
Check pattern select switch.
Check harness and connector between battery and pattern select switch,
pattern select switch and ECM (See page IN±30).
Replace pattern select switch.
Repair or replace harness or connector.
Check and replace ECM.
PatternResistance
MANU0 (continuity)
(open)NORM
Disconnect the pattern select switch connector.
Measure resistance between the terminals 3 and 4
of the pattern select switch connector when the se-
lect switch is set to MANU and NORM positions.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±107
Page 592 of 2543
O D Main Switch & O D OFF Indicator Light Circuit
CIRCUIT DESCRIPTION
The O/D main switch contacts go off when the switch is pushed in and comes on when it is pushed out.
In O/D main switch OFF position the O/D OFF indicator lights up, and the ECM prohibits shifting to over-
drive. The ECM also causes the O/D OFF indicator light to blink when a malfunction is detected. In this
case, connecting the terminals in the DLC2 or DLC1 can display the malfunction code.
(*) O/D Main Switch
Contacts go off with button pushed in.
Contacts go on with button pushed out. AT2±108
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING