Standard resistance

TESTER CONNECTIO

>N AND SPECIFIED

Tester Connection

Specified Condition

1 (OT2-) - 9 (OT2+)

25 ohms to 156 kohms

1 (OT2-) - Body ground

10 kohms or higher

9 (OT2+) - Body ground

10 kohms or higher

HINT:

If the resistance is outside the specified range of either ATF temperature shown in the table below, the driveability of the vehicle may decrease.

2006 TRANSMISSION A750E Automatic Transaxle - Sequoia

Land Cruiser Shift Solenoid Valve Slu
Fig. 92: Identifying E1 Transmission Wire Connector Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
ATF TEMPERATURE AND SPECIF

ATF temperature

Specified Condition

20°C (68°F)

3 to 4 kohms

110°C (230°F)

0.22 to 0.28 kohms

ED CONDITION

NG: REPAIR OR REPLACE TRANSMISSION WIRE OK: GO TO NEXT STEP. 2. CHECK WIRE HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

2006 TRANSMISSION A750E Automatic Transaxle - Sequoia a. Connect the E1 transmission wire connector.

b. Disconnect the E7 and E8 ECM connectors.

c. Measure the resistance.

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection

Specified Condition

E7-32 (THO2) - E8-28 (E2)

25 ohms to 156 kohms

E7-32 (THO2) - Body ground

10 kohms or higher

E8-28 (E2) - Body ground

10 kohms or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Ecm Toyota Landcruiser
Fig. 93: Identifying E7 And E8 ECM Connectors Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK: REPLACE ECM

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

2006 TRANSMISSION A750E Automatic Transaxle - Sequoia system 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.

Lock Clutch Monitoring

2006 TRANSMISSION A750E Automatic Transaxle - Sequoia

Fig. 94: DTC P2757 Torque Converter Clutch Pressure Control Solenoid Performance System Description

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

DTC No.

DTC Detection Condition

Trouble Area

P2757

Lock-up does not occur when driving in lock-up range (normal driving at 50 mph (80 km/h)), 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

• Torque converter clutch

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

• Line pressure is too low

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 the shift solenoid SLU. When the 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.

• 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.

2006 TRANSMISSION A750E Automatic Transaxle - Sequoia

The difference between engine speed and input turbine speed is less than 35 rpm. monitor strategy

MONITOR STRATEGY

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

Required sensors/Components

Shift solenoid valve SLU, Valve body, Vehicle speed sensor, Speed sensor (NT), Speed sensor (NO), Throttle position sensor

Frequency of operation

Continuous

Duration

OFF malfunction (A): 2 seconds

OFF malfunction (B): 0.4 seconds ON malfunction: 1.8 seconds

MIL operation

2 driving cycles

Sequence of operation

None

typical enabling conditions typical enabling conditions

The following conditions are common to all malfunctions below: OFF malfunction (A), (B) and ON malfunction

TYPICAL ENABLING CONDITIONS

The monitor will run whenever this DTC is not present.

None

Turbine speed sensor (NT) circuit

Not circuit malfunction

Output speed sensor (NO) circuit

Not circuit malfunction

Shift solenoid valve S1 circuit

Not circuit malfunction

Shift solenoid valve S2 circuit

Not circuit malfunction

Shift solenoid valve SR circuit

Not circuit malfunction

Torque converter clutch pressure control solenoid circuit

Not circuit malfunction

KCS sensor circuit

Not circuit malfunction

ETCS (Electric Throttle Control System)

Not system down

Transmission shift position

"D"

ECT (Engine Coolant Temperature)

40°C (104°F) or more

Spark advance from Max. retard timing by KCS control

0° crankshaft angle or more

Engine

Starting

ECM selected gear

4th or 5th

Vehicle speed

15.5 mph (25 km/h) or more

Shift solenoid valve S1 circuit

Not circuit malfunction

Shift solenoid valve S2 circuit

Not circuit malfunction

2006 TRANSMISSION A750E Automatic Transaxle - Sequoia

Shift solenoid valve SL2 circuit

Not circuit malfunction

1 - 2 shift valve

Not circuit malfunction

Transfer neutral position switch

OFF

OFF malfunction (A) TYPICAL ENABLING CONI

ITIONS

ECM lock-up command

(SLU pressure: 513 kPa (5.2 kgf*cm , 74 psi) or more)

Vehicle speed

Less than 62.2 mph (100 km/h)

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