Toyota Tundra. Manual — part 2837

Fig. 105: Identifying D63 No. 1 Transmission Wire Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: Go to step 3

OK: Go to next step.

2. CHECK HARNESS AND CONNECTOR (NO. 1 TRANSMISSION WIRE - ECM)

a. Disconnect the D74 ECM connector.

b. Measure the resistance according to the value (s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Result

Tester Connection

Condition Specified Condition

D74-9 (SLT+) - D74-8 (SLT-) 20°C (68°F)

5.0 to 5.6 ohms

D74-9 (SLT+) - Body ground

Always

10 kohms or higher

D74-8 (SLT-) - Body ground

Always

10 kohms or higher

Result

Proceed To

NG

A

OK (for 3UR-FE)

B

OK (for 3UR-FBE)

C

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

Fig. 106: Identifying D74 ECM Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

B: OK (for 3UR-FE) (See REMOVAL )

C: OK (for 3UR-FBE) (See REMOVAL )

3. INSPECT SHIFT SOLENOID VALVE SLT

a. Remove shift solenoid valve SLT.

b. Measure the resistance according to the value (s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

c. Connect the battery's positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to

terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an
operating noise.

OK: Valve moves and makes an operating noise.

NG: REPLACE SHIFT SOLENOID VALVE SLT (See DISASSEMBLY )

Tester Connection Condition Specified Condition

1 - 2

20°C (68°F)

5.0 to 5.6 ohms

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

Fig. 107: Identifying Shift Solenoid Valve SLT
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK: REPAIR OR REPLACE NO. 1 TRANSMISSION WIRE (See REMOVAL )

DTC P2740, P2742, P2743: TRANSMISSION FLUID TEMPERATURE SENSOR "B" CIRCUIT;
TRANSMISSION FLUID TEMPERATURE SENSOR "B" CIRCUIT LOW INPUT; TRANSMISSION
FLUID TEMPERATURE SENSOR "B" CIRCUIT HIGH INPUT

DESCRIPTION

The Automatic Transmission Fluid (ATF) temperature sensor is on the transmission, just in front of the oil
cooler inlet pipeline.

If the ECM detects an abnormally high ATF temperature near this sensor, it illuminates the warning light.

HINT:



The temperature of ATF easily rises when towing, climbing hills, in traffic, etc.



If the ATF temperature sensor becomes short-circuited, the signal that indicates that the ATF temperature
is 150°C (302°F) or higher is input into the ECM.

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

Vehicle conditions when the sensor is normal and when the sensor is short-circuited are indicated in the table
below.

PROBLEM SYMPTOM TABLE

DTC DETECTION CONDITION TABLE

No. 2 ATF

Temperature

Sensor State

Detection Condition

Symptom

Recovery Condition

Sensor is normal

ATF temperature more
than 150°C (302°F)

ATF temperature
warning light remains
ON

ATF temperature less than 135°
C (275°F)*1

ATF temperature more
than 130°C (266°F)

Shift point too high

ATF temperature less than 110°
C (230°F)

When conditions (a) and
(b) are satisfied

a. ATF temperature

more than 130°C
(266°F)

b. Engine coolant

temperature more
than 95°C (203°F)

Lock-up at 3rd gear*2

ATF temperature less than 110°
C (230°F)*1 and engine
coolant temperature more than
95°C (203°F)

Sensor is short-

circuited

Any conditions



ATF temperature
warning light
remains ON



Shift point too
high

Symptoms still occur

Engine coolant
temperature more than 95°
C (203°F)

Lock-up at 3rd gear*2

Symptoms still occur

HINT:
*1: When ATF temperature is in the normal range, it decreases to less than 135°C (275°F) within 5
minutes with the shift lever in the P or N position in an idling state.
*2: When ATF temperature is normal, transmission lock-up occurs in 5th or 6th gear with the shift lever
in the D position or S6 position, in 5th gear with the shift lever in the S5 position, and 4th gear with the
shift lever in the S4 position.

DTC

Code

DTC Detection Condition

Trouble Area

P2740

(a) and (b) are detected momentarily within 0.5 sec. when
neither P2742 nor P2743 are detected. (1-trip detection logic)

a. No. 2 ATF temperature sensor resistance is less than 25

ohms (0.046 V).

b. No. 2 ATF temperature sensor resistance is more than 156



Open or short in No. 2
ATF temperature sensor
circuit



No. 1 transmission wire

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra