1995 TOYOTA SUPRA ignition

INSPECTION PROCEDURE
Check main throttle position signal.
Voltage changes from 0 V to 8 V by stages.
Turn ignition switch ON.
Do not depress the brake pedal during the test. The
voltage will stay at 0 V if depressed.
Check voltage at the terminal TT of the DLC2 while
gradually depressing the accelerator pedal from
the fully closed position to the fully opened position.
(Close) Throttle Valve Opening Angle (Open)
Proceed to next circuit inspection shown on
matrix chart (See page AT2±64).
Replace throttle position sensor.
Repair or replace harness or connector.
Check main (sub)±throttle position sensor. (see page EG±292, 293)
Check harness and connector between ECM and Main (Sub)±throttle
position sensor (See page IN±30).
Check and replace ECM.
AT2±98± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

Check voltage between terminal KD 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 terminal KD of ECM con-
nector and body ground when accel. pedal is fully
depressed or not.
Fully depressed
(Kick±down SW is ON)
Released
(Kick±down SW is OFF)
Accel. pedalVoltage
Below 0.5 V
10 Ð 14 V
Proceed to next circuit inspection shown on
matrix chart (See page AT2±64).
1. Disconnect kick±down switch connector.
2. Measure resistance between terminals 1 and
2 of kick±down switch connector when kick±
down switch is on and off.
Kick±down switchResistance
ON0  (continuity)

(open)OFF
Replace kick±down switch.
Repair or replace harness or connector.
Check kick±down switch.
Check harness and connector between ECM and kick±down switch, kick±
down switch and body ground (See page IN±30).
Check and replace ECM.
INSPECTION PROCEDURE
AT2±100± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

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

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

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

Check operation of O/D main switch.
1. Turn ignition switch ON.
2. Check ªO/D OFFº indicator light when O/D but-
ton is pushed in to ON.
ªO/D OFFº indicator light goes off.
3. Check ªO/D OFFº indicator light when O/D
button is pushed again, to OFF.
ªO/D OFFº indicator light lights up.
If the ªO/D OFFº indicator light blinks when the O/D
button is pushed in to ON, a malfunction is occurring
in the system.
Check the diagnostic trouble code.
Check voltage between terminal OD2 of ECM connector and body ground.
Check harness and connector between O/D off indicator light and ECM (See
page IN±30).
Go to step
Repair or replaces harness or connector.
Check and replace ECM.
Proceed to next circuit inspection shown on
matrix chart (See page AT2±64).
O/D Main SwitchVoltage
OFF
ON
Below 0.5 V
10 ~ 14 V
Check voltage between terminal OD2 of ECM and
body ground.
1. Connect the Check Harness A to the ECM
(See page EG±510).
2. Turn ignition switch ON.
INSPECTION PROCEDURE
O/D OFF indicator light does not light up.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±109

Check voltage between terminal OD1 of ECM connector and body ground.
Measure voltage between terminal OD1 of ECM
connector and body ground.
Voltage: 4 Ð 6 V
Connect the Check Harness A to the ECM
Turn ignition switch ON.
Proceed to next circuit inspection shown on ma-
trix chart (See page AT2±64).
O D Cancel Signal Circuit
CIRCUIT DESCRIPTION
While driving with cruise control activated, in order to minimize gear shifting and provide smooth up±hill
cruising, overdrive may be prohibited temporarily in some conditions.
The Cruise Control ECU sends O/D cut signals to the ECM as necessary and the ECM cancels overdrive
shifting until these signals are discontinued.
(For details see the cruise control section, page BE±162)
INSPECTION PROCEDURE
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±111

Check voltage between terminal OD of Cruise Control ECU harness side
connector and body ground.
1. Disconnect Cruise Control ECU connector.
2. Turn ignition switch ON.
Repair or replace harness or connector.
Measure voltage between terminal OD of Cruise
Control ECU harness side connector and body
ground.
Voltage: 4 Ð 6 V
Check and replace Cruise Control ECU.
Check and replace ECM.
Check harness and connector between Cruise Control ECU and ECM (See
page IN±30).
AT2±112± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING