2003 LEXUS LS430 lock

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. 180: Identifying Lock-Up Operation Pressure Graph
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(*) Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle. For example, if A is the period of continuity
in one c
ycle, and B is the period of non-continuity, then Duty Ratio = A/(A+B) x 100(%).

Fig. 189: Transmission Control Switch - Wiring Diagram
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INSPECTION PROCEDURE
1.CHECK HARNESS AND CONNECTOR (BATTERY - TRANSMISSION CONTROL SWITCH)
a. Disconnect the transmission control switch connector of shift lock control unit assy.
b. Measure the voltage according to the value(s) in the table below.

OK: Go to next step
3.INSPECT TRANSMISSION CONTROL SWITCH
a. Measure resistance between each terminal of shift lock control unit assy when the shift lever is
moved to each position.
Fig. 193: Identifying Transmission Control Switch Connector Terminals

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Standard:

Fig. 194: Transmission Control Switch Reference Chart
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NG: REPLACE TRANSMISSION CONTROL SWITCH (See COMPONENTS
)
OK: Go to next step
4.CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM)
a. Connect the transmission control switch connector of shift lock control unit assy.
b. Turn the ignition switch to the ON position, and measure the voltage according to the value(s) in
the table below when the shift lever is moved to each position.

Fig. 195: Identifying ECM Connector Terminals
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Standard:
Fig. 196: Transmission Control Switch Reference Chart

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c. Turn the ignition switch to the LOCK position.
d. Disconnect the ECM connector.

Fig. 198: Transmission Control Switch Reference Chart
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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See ELECTRONIC CIRCUIT
INSPECTION PROCEDURE )
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
PATTERN SELECT SWITCH CIRCUIT (PWR)
CIRCUIT DESCRIPTION
Passenger side J/B ECU receives pattern select switch information, and sends it through the multiplex
communication system and CAN system to the ECM.
The ECM memory contains the shift programs for the NORMAL, POWER and SNOW patterns, 2 position, L
position and the loc
k-up patterns. By following the programs corresponding to the signals from the pattern
select switch, the neutral start and other various sensors, the ECM switches the solenoid valves ON and OFF,
and controls the transmission gear change and the lock-up clutch operation.
WIRING DIAGRAM

Fig. 202: Pattern Select Switch Reference Chart
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NG: REPLACE PATTERN SELECT SWITCH ASSY NO. 1
OK: Go to next step
3.CHECK HARNESS AND CONNECTOR (PATTERN SELECT SWITCH ASSY NO. 1 -
MULTIPLEX NETWORK BODY ECU)
a. Connect the connector of pattern select switch.
b. Disconnect the passenger side junction block assy (multiplex network body ECU) connector.
c. Measure the resistance between terminal PWR of passenger side junction block assy (multiplex
network body ECU) and body ground.
Standard:
Fig. 203: Pattern Select Switch Reference Chart

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