2003 LEXUS LS430 Factory Repair Manual

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Page 2817 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 125: Inspecting Shift Solenoid Valve (SL2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE SHIFT SOLENOID VALVE (SL2)

Page 2818 of 4500

LEXUS LS430 2003 Factory Repair Manual OK: REPAIR OR REPLACE TRANSMISSION WIRE (See step 5 on REPLACEMENT)
DTC P0781: 1-2 SHIFT (1-2 SHIFT VALVE)
SYSTEM DESCRIPTION
The 1-2 shift valve performs shifting to 1st gear and other gears.
Fig.

Page 2819 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 127: DTC Reference Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
Gear positions in the event of a solenoid valve mechanical problem:
Fig. 128: Gear Position Specification

Courtes

Page 2820 of 4500

LEXUS LS430 2003 Factory Repair Manual The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF" and switching oil pressure to
the valves in the valve body.
The ECM calculates the "actual" transmission ge

The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF" and switching oil pressure to
the valves in the valve body.
The ECM calculates the "actual" transmission gear by comparing the signals from the input speed sensor (NT)
and the output speed sensor (SP2). The ECM can detect many mechanical problems in the shift solenoids, valve
body, and the transmission clutches, brakes, and gears. If the ECM detects that the actual gear position and the
commanded gear position are different, it will illuminate the MIL and store the DTC.
MONITOR STRATEGY
MONITOR STRATEGY TABLE
TYPICAL ENABLING CONDITIONS
The following items are common to all conditions below.
TYPICAL ENABLING CONDITIONS TABLE
Related DTCsP0781: Valve body/Rationality check
Required sensors/ComponentsValve body, Automatic transmission assembly
Frequency of operationContinuous
Duration<0026005200510047004c0057004c005200510003000b0024000c00030044005100470003000b0025000c00030013001100170003005600480046001100030026005200510047004c0057004c005200510003000b0026000c00030016000300560048004600
110003[
Condition (C) 1 sec.
MIL operation2 driving cycles
Sequence of operationNone
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
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
Shift solenoid valve SL1 circuitNot circuit malfunction
Shift solenoid valve SL2 circuitNot circuit malfunction
ECT (Engine coolant temperature) sensor circuitNot circuit malfunction
KCS sensor circuitNot circuit malfunction
ETCS (Electric throttle control system)Not system down
Transmission range"D"
ECT40°C (104°F) or more
Spark advance from Max. retard timing by KCS
control0° CA or more
EngineStarting

Page 2821 of 4500

LEXUS LS430 2003 Factory Repair Manual Condition (A)
TYPICAL ENABLING CONDITIONS TABLE - A
Condition (B)
TYPICAL ENABLING CONDITIONS TABLE - B
Condition (C)
TYPICAL ENABLING CONDITIONS TABLE - C
Condition (D)
TYPICAL ENABLING CO

Page 2822 of 4500

LEXUS LS430 2003 Factory Repair Manual TYPICAL MALFUNCTION THRESHOLDS TABLE - MALFUNCTION B
Malfunction (C)
TYPICAL MALFUNCTION THRESHOLDS TABLE - MALFUNCTION C
Malfunction (D)
TYPICAL MALFUNCTION THRESHOLDS TABLE - MALFUNCTION D
INS

Page 2823 of 4500

LEXUS LS430 2003 Factory Repair Manual method to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
a. Warm up the engine.
b. Turn the ignition switch off.
c. Connect the hand-held tester together wit

Page 2824 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 131: Gear Position Specification
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK:
Gear position changes in accordance with the tester command.
NG: REPAIR OR REPLACE TRANSMISSION VALVE BODY

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