1995 TOYOTA SUPRA sensor

AT2±101AT2±99AT2±103AT2±105AT2±108AT2±111EG±312AT2±60AT2±66AT2±68AT2±92BR±128AT2±70
Park/neutral position
switchPattern select switch
circuitStop light switch
circuitKick±down switch
circuitO/D switch O/D OFF
indicator light circuitEngine coolant temp.
sensor circuitO/D cancel signal
circuitECMNo.5 solenoid
circuitOFF±Vehicle repair
matrix chartOn±Vehicle repair
matrix chartTRAC ECUA/T fluid temp.
sensor circuit
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±65

WIRING DIAGRAM CIRCUIT INSPECTION
DTC 38 A T Fluid Temperature Sensor Circuit
CIRCUIT DESCRIPTION
The fluid temp. sensor converts fluid temp. into resistance values which is input into the ECM.
 DTC No. Diagnostic Trouble Code Detection Condition Trouble Area
 
 
 
 
 
 
38
 
 
 
 
 
 
Either (a) or (b) are detected for 0.5 sec. or
more.
(a) Temp. sensor resistance less 79

(b) After the engine has been operating for 15
minutes or more, the resistance at the
temp. sensor is more than 156 k
 
 
 
 
 
 

Harness or connector between A/T fluid
temp. sensor and ECM

A/T fluid temp. sensor

ECM
AT2±70± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

INSPECTION PROCEDURE
Check A/T fluid temp. sensor.
Check harness and connector between A/T fluid temp. sensor and ECM
(See page IN±30).
Replace A/T fluid temp. sensor.
Repair or replace harness or connector.
Check sensor resistance
Remove A/T fluid temp. sensor.
Measure resistance between terminals of A/T fluid
temp. sensor at 20°C (68°F) and 110°C (230°F).
Resistance:
20°C (68°F): Approx. 12.08 k

11 0°C (230°F): Approx. 0.78 k

20°C (68°F) and 110°C (230°F).
Check and replace ECM.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±71

CIRCUIT DESCRIPTION
Transmission
Output Shaft
No.1 Vehicle
Speed Sensor
The No. 1 vehicle speed sensor outputs a 4±pulse signal for every revolution of the rotor shaft, which
is rotated by the transmission output shaft via the driven gear. After this signal is converted into a more
precise rectangular waveform by the waveform shaping circuit inside the combination meter, it is then
transmitted to the engine control module. The ECM determines the vehicle speed based on the fre-
quency of these pulse signals.
Diagnostic Trouble Code Detection ConditionDTC No.Trouble Area
42

No. 1 vehicle Speed sensor

Telltale light RH

Harness or connector between No. 1 vehicle
speed sensor and ECM

ECMAll conditions below are detected for 4 secs. or
more. (2 trips detection logic)*
(a) No No.1 vehicle speed sensor signal in 16
pulses of No.2 vehicle speed sensor signal.
(b) Vehicle speed: 9 km/h (5.6 mph) or more
(c) Park/neutral position switch:
OFF (Other than P or N position)
HINT: In test mode, diagnostic trouble code 42 is output when vehicle speed is 5 km/h (3 mph) or
below.


Waveform between terminals SP1 and E2 when vehicle speed is approx. 20 km/h (12 mph).
HINT: As the vehicle's speed increases, the signal output from
SP1 increases.
* See page AT2±58
Driven Gear
No.1 Vehicle Speed Sensor
Telltale Light
RH
DTC 42 No.1 Vehicle Speed Sensor Signal Circuit
AT2±72± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

Check operation of No.1 vehicle speed sensor (see page BE±46).
Repair or replace harness or connector between
telltale light RH and No.1 vehicle speed sensor.
Replace No.1 vehicle speed sensor.
AT2±74± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

The No.4 solenoid valve controls the hydraulic pressure acting on
the brakes and clutches of the planetary gear units when gears are
shifted and performs smooth gear shifting.
The ECM determines optimum operating pressure according to
the signals from the throttle position sensor, vehicle speed sensor
and O/D clutch speed sensor and controls the volume of current
flow to the solenoid valve.
The amount of electric current to the solenoid is controlled by the
(*) duty ratio of ECM output signals, causing momentary change
to the hydraulic pressure acting on the clutches during gear shift-
ing. When the duty ratio is high, the hydraulic pressure acting on
the clutches is now.
(*) Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle.
For example, if A is the period of continuity in one cycle, and B is the period of non±continuity, then
Diagnostic Trouble Code Detection ConditionDTC No.Trouble Area
46

No. 4 solenoid valve

Harness or connector between No.4
solenoid valve and ECM

ECMAll conditions below are detected for 1 sec. or
more. (2 trips detection logic)*
(a) ECM outputs duty signal to No.4 solenoid in
90% or higher duty ratio.
(b) Current to No.4 solenoid:
330 + 100 mA or less
(O/D OFF indicator light doesn't blink)

* See page AT2±58

Waveform between terminals SLN
and E1 when engine is idling.
Waveform between terminals SLN
and E1 during shift change.
Lock±up
operation
pressure
Current flow to
solenoid
Duty Ratio =
CIRCUIT DESCRIPTION

100 (%)
DTC 46 No.4 Solenoid Valve Circuit (For Accumulator Back
Pressure Modulation)
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±75

CIRCUIT DESCRIPTION
The No. 2 vehicle speed sensor detects the rotation speed of the transmission output shaft and sends
signals to the ECM. The ECM determines the vehicle speed based on these signals. An AC voltage
is generated in the No.2 vehicle speed sensor coil as the rotor mounted on the output shaft rotates,
and this voltage is sent to the ECM.
The gear shift point and lock±up timing are controlled by the ECM based on the signals from this vehicle
speed sensor and the throttle position sensor signal.
If the No.2 vehicle speed sensor malfunctions, the ECM uses input signals from the No.1 vehicle speed
sensor as a back±up signal.
No.2 Vehicle Speed Sensor
No.2 Vehicle Speed Sensor
Generated
Waveform
DTC No.Trouble Area
61

No. 2 vehicle speed sensor

Harness or connector between No.2
vehicle speed sensor and ECM

ECM
All conditions below are detected. (2 trips
detection logic)*
(a) No No.2 vehicle speed sensor signal in 4
pulses of No. 1 vehicle speed sensor
signal.
(b) Vehicle speed: 9 km/h (5.6 mph) or more
for 4 secs. or more.
(c) Park/neutral position switch:
OFF (Other than P or N position)
Diagnostic Trouble Detection Condition

*: See page AT2±58

Waveform between terminals SP2+ and SP2± when vehicle speed is approx. 60 km/h (37 mph).
5 V/division
2 msec./division
DTC 61 No.2 Vehicle Speed Sensor Circuit
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±79

Check No.2 vehicle speed sensor.
Replace No.2 vehicle speed sensor.
Remove No.2 vehicle speed sensor from trans-
mission (See page AT2±16).
Measure resistance between terminals 1 and 2 of
No.2 vehicle speed sensor.
Resistance: 560 Ð 680

Check and repair harness and connector between
ECM and No.2 vehicle speed sensor (See page
IN±30).

Check the speed sensor's function
Check voltage between terminals 1 and 2 of the
speed sensor when a magnet is put close to the
front end of the speed sensor then taken away
quickly.
Voltage is generated intermittently.
The voltage generated is extremely low.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±81