Identifying condition LEXUS LS430 2003 Factory Repair Manual

Fig. 155: Identifying Transmission Wire Terminals
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Standard:
TRANSMISSION WIRE (SR) - RESISTANCE TABLE
NG: Go to step 3
OK: Go to next step
2.CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
a. Connect the transmission connector to the transmission.
b. Disconnect the connector from the ECM.
c. Measure the resistance accordin
g to the value(s) in the table below.
Tester ConnectionSpecified Condition 20°C (68°F)
6 - Body ground11 to 15ohms

Fig. 167: DTC P2716 - Wiring Diagram
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INSPECTION PROCEDURE
1.INSPECT TRANSMISSION WIRE (SLT)
a. Disconnect the transmission wire connector from the transmission.
b. Measure the resistance according to the value(s) in the table below.
Fig. 168: Identifying Transmission Wire Terminals

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Standard:
TRANSMISSION WIRE (SLT) - RESISTANCE TABLE
c. Measure the resistance according to the value(s) in the table below.
Standard (Check for short):
Tester ConnectionSpecified Condition 20°C (68°F)
13 (SLT+) - 5 (SLT-)5.0 to 5.6 ohms

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

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Fig. 174: Identifying Lock-Up Operation Pressure Graph
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Fig. 175: DTC Reference Chart

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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

1.INSPECT TRANSMISSION WIRE (SLU)
a. Disconnect the transmission wire connector from the transmission.
b. Measure the resistance according to the value(s) in the table below.
Fig. 184: Identifying Transmission Wire Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Standard:
TRANSMISSION WIRE (SLU) - RESISTANCE TABLE
c. Measure the resistance according to the value(s) in the table below.
Standard (Check for short):
Tester ConnectionSpecified Condition 20°C (68°F)
12 (SLU+) - 4 (SLU-)5.0 to 5.6 ohms

Fig. 192: Identifying Transmission Control Switch Connector Terminals
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Standard:
TRANSMISSION CONTROL SWITCH - BODY GROUND - RESISTANCE TABLE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See ELECTRONIC CIRCUIT
INSPECTION PROCEDURE )
Tester ConnectionSpecified Condition
5 - Body groundBelow 1 ohms

Fig. 200: Identifying Pattern Select Switch Connector Terminals
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Standard:
PATTERN SELECT SWITCH NO. 1 - BODY GROUND - RESISTANCE TABLE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See ELECTRONIC CIRCUIT
INSPECTION PROCEDURE )
OK: Go to next step
Tester ConnectionSpecified Condition
1 - Body groundBelow 1 ohms

a. Disconnect the connector of pattern select switch.
b. Measure the resistance according to the value(s) in the table below.
Fig. 206: Identifying Pattern Select Switch Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Standard:
PATTERN SELECT SWITCH NO. 1 - BODY GROUND - RESISTANCE TABLE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See ELECTRONIC CIRCUIT
INSPECTION PROCEDURE )
Tester ConnectionSpecified Condition
1 - Body groundBelow 1 ohms

Fig. 9: Identifying Connector Terminals Heated Oxygen Sensor
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c. Bank 1 sensor 2, bank 2 sensor 2:
Disconnect the sensor connector.
d. Measure the resistance between terminals 1 (HT) and 2 (+B).
Standard:
RESISTANCE CONDITION
If the result is not as specified, replace the sensor.
ConditionSpecified Condition
20°C (68°F)11 to 16 ohms

Fig. 12: Identifying Waveform 1
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Waveform 2 (Reference):
WAVEFORM 2 REFERENCE TABLE
TerminalCODE - GND
Tool Setting10 V/DIV., 20ms/DIV.
ConditionNo key in ignition key cylinder -> Key inserted