Toyota Tundra. Manual — part 2839

Resistance (Reference)

TERMINALS RESISTANCE REFERENCE TABLE

NG: REPAIR OR REPLACE NO. 1 TRANSMISSION WIRE (NO. 2 ATF TEMPERATURE
SENSOR) (See REMOVAL )

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

ATF temperature Specified Condition

10°C (50°F)

5 to 8 kohms

25°C (77°F)

2.5 to 4.5 kohms

110°C (230°F)

0.22 to 0.28 kohms

Tester Connection

Condition Specified Condition

D74-99 (THO2) - D74-98 (ETHA) Always 25 ohms to 156 kohms
D74-99 (THO2) - Body ground

Always

10 kohms or higher

D74-98 (ETHA) - 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. 109: 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 )

DTC P2757: TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID
PERFORMANCE (SHIFT SOLENOID VALVE SLU)

DESCRIPTION

The ECM uses the signals from the throttle position sensor, air-flow meter, turbine (input) speed sensor, output
speed sensor and crankshaft position sensor to monitor the engagement condition of the lock-up clutch.

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra

Fig. 110: Identifying Shift Solenoid Valve SLU
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Then the ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the ECM
memory to detect mechanical problems of the shift solenoid valve SLU, valve body and torque converter clutch.

DTC DETECTION CONDITION TABLE

MONITOR DESCRIPTION

Torque converter lock-up is controlled by the ECM based on the turbine (input) speed sensor NT, output speed
sensor SP2, engine RPM, engine load, engine temperature, vehicle speed, transmission temperature, and gear
selection. The ECM determines the lock-up status of the torque converter by comparing the engine RPM (NE)
to the input turbine RPM (NT). The ECM calculates the actual transmission gear by comparing input turbine
RPM (NT) to output shaft RPM (SP2). When conditions are appropriate, the ECM requests lock-up by applying
control voltage to shift solenoid SLU. When SLU is turned ON, it applies pressure to the lock-up relay valve
and locks the torque converter clutch.

If the ECM detects no lock-up after lock-up has been requested or if it detects lock-up when it is not requested,
the ECM interprets this as a fault in the shift solenoid valve SLU or lock-up system performance.

The ECM will illuminate the MIL and store the DTC.

Example:

When one of the following conditions is met, the system determines that there is a malfunction.



There is a difference in rotation between the input side (engine speed) and output side (input turbine
speed) of the torque converter when the ECM commands lock-up ON.

Engine speed is at least 70 RPM greater than input turbine speed.

DTC

Code

DTC Detection Condition

Trouble Area

P2757

Lock-up does not occur when driving in the lock-up range
(normal driving at 80 km/h (50 MPH)), or lock-up remains ON
in the lock-up OFF range (2 trip detection logic)



Shift solenoid valve
SLU remains open or
closed



Valve body is blocked



Shift solenoid valve
SLU



Torque converter clutch



Automatic transmission
(clutch, brake, gear, etc.)



Line pressure is too low



ECM

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra



There is no difference in rotation between the input side (engine speed) and output side (input turbine
speed) of the torque converter when the ECM commands lock-up OFF.

The difference between engine speed and input turbine speed is less than 35 RPM.

MONITOR STRATEGY

MONITOR STRATEGY TABLE

TYPICAL ENABLING CONDITIONS

All

TYPICAL ENABLING CONDITIONS TABLE

Related DTCs

P2757:
Shift solenoid valve SLU/OFF malfunction
Shift solenoid valve SLU/ON malfunction

Required sensors/Components

Shift solenoid valve SLU

Frequency of operation

Continuous

Duration

OFF malfunction (A)
2 sec.
OFF malfunction (B)
0.4 sec.
ON malfunction
1.8 sec.

MIL operation

2 driving cycles

Sequence of operation

None

The monitor will run whenever the following DTCs are not stored

None

Turbine speed sensor circuit

Not circuit malfunction

Output speed sensor circuit

Not circuit malfunction

Shift solenoid valve S1 circuit

Not circuit malfunction

Shift solenoid valve S2 circuit

Not circuit malfunction

Shift solenoid valve S3 circuit

Not circuit malfunction

Shift solenoid valve S4 circuit

Not circuit malfunction

Shift solenoid valve SR circuit

Not circuit malfunction

Shift solenoid valve SLU circuit

Not circuit malfunction

KCS sensor circuit

Not circuit malfunction

ETCS (Electric Throttle Control System)

Not system down

Transmission position

D

Duration time from shifting N to D

4 sec. or more

ECT (Engine Coolant Temperature)

40°C (104°F) or higher

Spark advance from max. retard timing by KCS control

0° crankshaft angle or more

Engine

Starting

ECM selected gear

2nd, 3rd, 4th, 5th or 6th

2009 Toyota Tundra

2009 TRANSMISSION AB60F Automatic Transaxle - Tundra