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2nd coast brake(B1)
Direct clutch (C
2)
No.2 one±way
clutch (F
2)
Forward clutch
(C1)
Front and rear
planetary gear unit2nd brake (B
2)
No.1 one±way
clutch (F
1)
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT1±63
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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 than 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
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT1±64
Page 451 of 2543
INSPECTION PROCEDURE
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
110°C (230°F) Approx. 0.78 k
Replace A/T fluid temp. sensor.
Repair or replace harness or connector.
Check harness and connector between battery and A/T fluid temp. sensor
A/T fluid temp. sensor and ECM. (See page IN±30).
Check A/T fluid temp. sensor.
Check and replace ECM. AT1±65
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING
Page 452 of 2543

DTC 42 No. 1 Vehicle Speed Sensor Signal Circuit
CIRCUIT DESCRIPTION
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 ECM. The ECM determines the vehicle speed based on the frequency of these pulse
signals.
All conditions below are detected 500 times or more
continuously. (2 trip detection logic)*
Diagnostic Trouble Code Detection ConditionDTC No.Trouble Area
No. No. 1 vehicle speed sensor signal in 16
pulses of No. 2 vehicle speed sensor signal.
Vehicle speed: 9 km/h (5.6 mph) or more for 4
secs. or more for 4 secs. or more.
Park/neutral position switch:
OFF (Other than P or N position)
42
No. 1 vehicle speed sensor
Telltale light RH
Harness or connector between No. 1 vehicle
speed sensor and ECM
ECM
HINT: In test more, diagnostic trouble code 42 is output when vehicle speed is 5 km/h (3 mph) or
below.
See page AT1±54
< Reference >
HINT: As the vehicle's speed increases, the signal output from
SP1 increases.
Waveform between terminals SP1 and E2 when vehicle speed is approx. 20 km/h (12 mph).
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT1±66
Page 453 of 2543
INSPECTION PROCEDURE
Shift the shift lever to N position.
Jack up one of the rear wheels.
Connect the Check Harness A
(See page EG±404)
Disconnect power steering ECU connector
and cruise control ECU connector.
Turn ignition switch ON.
Measure voltage between terminal SP1 of ECM
connector and body ground when the wheel is
turned slowly.
Check voltage between terminal SP1 of ECM connector and body ground.
Voltage is generated intermittently.
Check and replace ECM.
Repair or replace harness or connector be-
tween ECM and telltale light RH.
Check operation of odometer and trip meter (telltale light RH (See page
BR±48))
AT1±67± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING
Page 454 of 2543
Replace No. 1 vehicle speed sensor.
Repair or replace harness or connector between tell-
tale light RH and No. 1 vehicle speed sensor.
Check operation of No. 1 vehicle speed sensor (See page BR±46).
AT1±68± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING
Page 455 of 2543

DTC 61 No. 2 Vehicle Speed Sensor Circuit
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.
See page AT1±54
All conditions below are detected 500 times or more
continuously. (2 trip detection logic)*
Diagnostic Trouble Code Detection ConditionDTC No.Trouble Area
No. No. 2 vehicle speed sensor signal in 4
pulses of No. 2 vehicle speed sensor signal.
Vehicle speed: 9 km/h (5.6 mph) or more for 4
secs. or more for 4 secs. or more.
Park/neutral position switch:
OFF (Other than P or N position)
61
No. 2 vehicle speed sensor
Harness or connector between No. 2 vehicle
speed sensor and ECM
ECM
< Reference >Waveform between terminals SP2± and SP2± when vehicle
speed is approx. 60 km/h (37 mph).
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT1±69
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WIRING DIAGRAM
INSPECTION PROCEDURE
Connect the Check Harness A to the ECM (See
page EG±404).
Check resistance between terminals SP2+ and
SP2
- of ECM connector.
Resistance: 560 ± 680
Proceed to next circuit inspection shown on
matrix chart (See page AT1±58).
Check resistance between terminals SP2+ and SP2± of ECM connector.
AT1±70± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING