2003 LEXUS LS430 torque

OK: REPAIR OR REPLACE TRANSMISSION WIRE (See step 5 on REPLACEMENT)
DTC P2757: TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID
PERFORMANCE (SHIFT SOLENOID VALVE SLU)
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.
Then the ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the ECM
memory to detect a mechanical problems of the shift solenoid valve SLU, valve body and torque converter
clutch.
Fig. 173: Identifying Manual Transmission

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 174: Identifying Lock-Up Operation Pressure Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 175: DTC Reference Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
MONITOR DESCRIPTION
Torque converter lock-up is controlled by the ECM based on 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 volta
ge to shift solenoid SLU. When the SLU is turned on, solenoid SLU 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 turn on the MIL and store the DTC.
Example:
When any of the following is met, the system judges it as a malfunction.
a. There is a difference in rotation between before and after torque converters even when the ECM
commands lock-up.
(Engine speed is at least 75 rpm greater than input turbine speed.)
b. There is no difference in rotation between before and after torque converters even when the ECM
commands lock-up off.
(The difference between engine speed and input turbine speed is less than 35 rpm.)
MONITOR STRATEGY
Fig. 176: Monitor Strategy Specification Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TYPICAL ENABLING CONDITIONS
The following items are common to all conditions below.
TYPICAL ENABLING CONDITIONS TABLE
The monitor will run whenever this DTC is not
present.SEE LIST OF DISABLE A MONITOR
Turbine speed sensor circuitNot circuit malfunction
Output speed sensor circuitNot circuit malfunction

OFF malfunction (A)
TYPICAL ENABLING CONDITIONS TABLE - OFF MALFUNCTION A
OFF malfunction (B)
TYPICAL ENABLING CONDITIONS TABLE - OFF MALFUNCTION B
ON malfunction
TYPICAL ENABLING CONDITIONS TABLE - ON MALFUNCTION
Shift solenoid valve S1 circuitNot circuit malfunction
Shift solenoid valve S2 circuitNot circuit malfunction
Shift solenoid valve S3 circuitNot circuit malfunction
Shift solenoid valve S4 circuitNot circuit malfunction
Shift solenoid valve SR circuitNot circuit malfunction
Torque converter clutch pressure control solenoid
circuitNot circuit malfunction
KCS sensor circuitNot 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
control0° CA or more
EngineStarting
ECM selected gear4th, 5th or 6th
Vehicle speed25 km/h (15.5 mph) or more
Shift solenoid valve S1 circuitNot circuit malfunction
Shift solenoid valve S3 circuitNot circuit malfunction
Shift solenoid valve S4 circuitNot circuit malfunction
Shift solenoid valve SL2 circuitNot circuit malfunction
1 - 2 shift valveNot circuit malfunction
ECM lock - up commandON (SLU pressure: 513 kPa or more)
Duration time from lock-up on command3 sec. or more
Vehicle speedLess than 100 km/h (62.2 mph)
ECM selected gear2nd
Vehicle speed2 km/h (1.2 mph) or more
Output speed2nd --> 1st down shift point or more
Throttle valve opening angle6.5% or more (Varies with engine speed)
ECM lock - up commandOFF (SLU pressure: less than 4 kPa)
Duration time from lock-up on command3 sec. or more

SHIFT SOLENOID VALVE (SLU) - RESISTANCE TABLE
c. Connect the positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1
of the solenoid valve connector, then check the movement of the valve.
OK:
The solenoid makes an operating noise.
NG: REPLACE SHIFT SOLENOID VALVE (SLU)
OK: Go to next step
3.INSPECT TRANSMISSION VALVE BODY ASSY (See chapter 2 in PROBLEM SYMPTOMS
TABLE )
OK:
There are no foreign objects on each valve and they operate smoothly.
NG: REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSY (See step 6 on
REPLACEMENT
)
OK: Go to next step
4.INSPECT TORQUE CONVERTER CLUTCH ASSY (See INSPECTION
)
OK:
The torque converter clutch operates normally.
NG: REPLACE TORQUE CONVERTER CLUTCH ASSY
OK: REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSY (See COMPONENTS
)
DTC P2759: TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL
CIRCUIT ELECTRICAL (SHIFT SOLENOID VALVE SLU)
CIRCUIT DESCRIPTION
The amount of current flow to the solenoid is controlled by the (*) duty ratio of the ECM output signal. The
hi
gher the duty ratio becomes, the higher the lock-up hydraulic pressure becomes during the lock-up operation.
Tester ConnectionSpecified Condition 20°C (68°F)
1 - 25.0 to 5.6 ohms

Fig. 26: Applying Adhesive
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2. Install the valve.
Torque: 27 N.m (275 kgf.cm, 20 ft.lbf)
HINT:
After applying the specified torque, turn the valve clockwise with the port facing the direction
shown in the illustration.
b. Install the ventilation valve cover.
c. Connect the ventilation hose to the valve.

Fig. 31: Removing Nuts Spacers Canister Assembly
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
4.INSTALL CHARCOAL CANISTER ASSY
a. Install the canister and 4 spacers with the 4 nuts.
Torque: 5.5 N.m (5.6 kgf.cm, 4.9 in.lbf)

Fig. 17: Installing Bolts, Nuts And Throttle Body And Gasket
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Install a new gasket and the throttle body with the 2 bolts and 2 nuts.
Torque: 18 N.m (185 kgf.cm, 13 ft.lbf)
b. Connect the water bypass hose and water bypass hose No. 7.
c. Connect the connector.
7.INSTALL INTAKE AIR CONNECTOR PIPE
a. Install the intake air connector pipe with the bolt and 2 hose clamps.
Torque:
4.0 N.m (41 kgf.cm, 35 in..lbf) for hose clamp
5.0 N.m (51 kgf.cm, 44 in..lbf) for bolt
b. Connect the air hose and ventilation hose.
8.INSTALL AIR CLEANER INLET NO.1
9.INSTALL V-BANK COVER
Torque: 5.0 N.m (51 kgf.cm, 44 in..lbf)
10.REFILL ENGINE COOLANT (See ENGINE COOLANT
)
11.CHECK FOR ENGINE COOLANT LEAKS (See ON
-VEHICLE INSPECTION )