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DI-1083
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
DIDVQ-01

DTC P2740 Transmission Fluid Temperature Sensor "B"
Circuit

DTC P2742 Transmission Fluid Temperature Sensor "B"
Circuit Low Input

DTC P2743 Transmission Fluid Temperature Sensor "B"
Circuit High Input

CIRCUIT DESCRIPTION
ATF (Automatic Transmission Fluid) temperature sensor No.2 is on the transmission and just in front of the
oil cooler inlet pipeline.
If ECM detects the abnormally high temperature of ATF by this sensor, it draws driver's attention by illuminat-
ing the warning lamp.
HINT:
S The temperature of ATF easily rises when towing, climbing hills and in traffic, etc.
S If the ATF temperature sensor No.2 becomes short-circuited, the signal that indicates the ATF temper-
ature is 150_C (302_F) or higher is input in ECM.
Vehicle conditions when the sensor is normal and when the sensor is short-circuited are indicated
in the table below.
ATF temperature Sensor No.2
Detection Condition Symptom Recovery Condition
State
S AT fluid temp. more than 150_C S AT Oil Temp. warning light re- S AT fluid temp. less than 135_C
(302_F). mains on (275_F). *2
S AT fluid temp. more than 130_C S AT fluid temp. less than 110_C
S Shift point too high.
(266_F). (230_F).
When the conditions (a) and (b)
Sensor is normal
are satisfied.
S AT fluid temp. less than 110_C
(a) AT fluid temp. more than 130_C
S Lock-up at 3rd gear. *1 (230_F) *2 and engine coolant
(266_F).
temp. less than 95_C (203_F).
(b) Engine coolant temp. more
than 95_C (203_F).
S AT Oil Temp. warning light re-
S Any conditions. mains on S Symptoms still occur
Sensor is short-circuited S Shift point too high.
S Engine coolant temp. more than
S Lock-up at 3rd gear. *1 S Symptoms still occur
95_C (203_F).

HINT:
*1: When AT fluid temperature is normal, transmission locks up at 5th gear with the shift lever in D position
and at 4th gear with the shift lever in 4 position.
*2: When AT fluid temperature is in normal range, it decreases to less than 135_C (275_F) within 5 minutes
with the shift lever in P or N position in an idling state.
DI-1084
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)

DTC No. DTC Detecting Condition Trouble Area
(a) and (b) are detected momentarily within 0.5 sec. when
neither P2742 nor P2743 is detected (1-trip detection logic)
(a) ATF temperature sensor No.2 resistance is less than 25
(0.046 V) S Open or short in ATF temperature sensor No.2 circuit
P2740 (b) ATF temperature sensor No.2 resistance is more than 156 S Transmission wire (ATF temperature sensor No.2)
k (4.915 V) S ECM
HINT:
Within 0.5 sec. the malfunction switches from (a) to (b) or from
(b) to (a)
S Short in ATF temperature sensor No.2 circuit
ATF temperature sensor No.2 resistance is less than 25
P2742 S Transmission wire (ATF temperature sensor No.2)
(0.046 V) for 0.5 sec. or more (1-trip detection logic)
S ECM
ATF temperature No.2 sensor resistance is more than 156 k S Open in ATF temperature sensor No.2 circuit
P2743 (4.915 V) when 15 minutes or more after the engine start S Transmission wire (ATF temperature sensor No.2)
DTC is detected for 0.5 sec. or more (1-trip detection logic) S ECM

MONITOR DESCRIPTION
The Automatic Transmission Fluid (ATF) temperature sensor converts ATF temperature to an electrical re-
sistance value. Based on the resistance, the ECM determines the ATF temperature, and the ECM detects
an open or short in the AFT temperature circuit. If the resistance value of the ATF temperature is less than
25 (0.046 V) or more than 156 k (4.915 V), the ECM interprets this as a fault in the ATF sensor or wiring.
The ECM will turn on the MIL and store the DTC.

MONITOR STRATEGY
P2740 ATF temperature sensor/Range check (Fluttering)

Related DTCs P2742 ATF temperature sensor/Range check (Low voltage)
P2743 ATF temperature sensor/Range check (High voltage)
Required sensors/Components ATF temperature sensor (TFT sensor)
Frequency of operation Continuous
Duration 0.5 sec.
MIL operation Immediate
Sequence of operation None

TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever these
See page DI-963
DTCs are not present.

Range check (Fluttering, Low voltage)
The typical enabling condition is not avail-
-
able.

Range check (High voltage)
Time after engine start 15 min. or more -
DI-1085
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)

TYPICAL MALFUNCTION THRESHOLDS
Detection criteria Threshold
Range check (Fluttering)
Less than 0.046 V
TFT (transmission fluid temperature) sensor voltage or
More than 4.915 V
Range check (Low voltage)
TFT (transmission fluid temperature) sensor voltage Less than 0.046 V
Range check (High voltage)
TFT (transmission fluid temperature) sensor voltage More than 4.915 V

COMPONENT OPERATING RANGE
Parameter Standard value
TFT (transmission fluid temperature) sensor Atmospheric temperature to approx. 130

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