sensor LEXUS LS430 2003 Factory Repair Manual

Shifting from 1st to 6th is performed in combination with "ON" and "OFF" operation of the shift solenoid
valves SL1, SL2, S1, S2, S3, S4 and SR which is controlled by the ECM. If an open or short circuit occurs in
either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the
vehicle to be operated smoothly. (In case of an open or short circuit, the ECM stops sending current to the
circuit.) Fail safe function (see FAIL
-SAFE CHART ).
Fig. 133: DTC Reference Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
MONITOR DESCRIPTION
These DTCs indicate an open or short in the shift solenoid valve S1 circuit. When there is an open or short
circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores the
DTC. When the shift solenoid valve S1 is on, if resistance is 8 ohms or less, the ECM determines there is a
short in the shift solenoid valve S1 circuit.
When the shift solenoid valve S1 is off, if resistance is 100 kohms or more, the ECM determines there is an
open in the shift solenoid valve S1 circuit (see FAIL
-SAFE CHART ).
MONITOR STRATEGY
MONITOR STRATEGY TABLE
TYPICAL ENABLING CONDITIONS
P0973: Range check (Low resistance)
TYPICAL ENABLING CONDITIONS TABLE - P0973
Related DTCsP0973: Shift solenoid valve S1 /Range check (Low
resistance) P0974: Shift solenoid valve S1 /Range
check (High resistance)
Required sensors/ComponentsShift solenoid valve S1
Frequency of operationContinuous
Duration0.064 sec. or more
MIL operationImmediate
Sequence of operationNone
The monitor will run whenever this DTC is not
present.See LIST OF DISABLE A MONITOR

CIRCUIT DESCRIPTION
Shifting from 1st to 6th is performed in combination with "ON" and "OFF" operation of the shift solenoid
valves SL1, SL2, S1, S2, S3, S4 and SR which is controlled by the ECM. If an open or short circuit occurs in
either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the
vehicle to be operated smoothly. (In case of an open or short circuit, the ECM stops sending current to the
circuit.) Fail safe function (see FAIL
-SAFE CHART ).
Fig. 138: DTC Reference Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
MONITOR DESCRIPTION
These DTCs indicate an open or short in the shift solenoid valve S2 circuit. When there is an open or short
circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores the
DTC. When the shift solenoid valve S2 is on, if resistance is 8ohms or less, the ECM determines there is a short
in the shift solenoid valve S2 circuit.
When the shift solenoid valve S2 is off, if resistance is 100 kohms or more, the ECM determines there is an
open in the shift solenoid valve S2 circuit (see FAIL
-SAFE CHART ).
MONITOR STRATEGY
MONITOR STRATEGY TABLE
TYPICAL ENABLING CONDITIONS
P0976: Range check (Low resistance)
TYPICAL ENABLING CONDITIONS TABLE - P0976
Related DTCsP0976: Shift solenoid valve S2/Range check (Low
resistance) P0977: Shift solenoid valve S2/Range
check (High resistance)
Required sensors/ComponentsShift solenoid valve S2
Frequency of operationContinuous
Duration0.064 sec. or more
MIL operationImmediate
Sequence of operationNone

DTC P0979, P0980: SHIFT SOLENOID "C" CONTROL CIRCUIT LOW/HIGH (SHIFT SOLENOID
VALVE S3)
CIRCUIT DESCRIPTION
Shifting from 1st to 6th is performed in combination with "ON" and "OFF" operation of the shift solenoid
valves SL1, SL2, S1, S2, S3, S4 and SR which is controlled by the ECM. If an open or short circuit occurs in
either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the
vehicle to be operated smoothly. (In case of an open or short circuit, the ECM stops sending current to the
circuit.) Fail safe function (see FAIL
-SAFE CHART ).
Fig. 143: DTC Reference Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
MONITOR DESCRIPTION
These DTCs indicate an open or short in the shift solenoid valve S3 circuit. When there is an open or short
circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores the
DTC. When the shift solenoid valve S3 is on, if resistance is 8ohms or less, the ECM determines there is a short
in the shift solenoid valve S3 circuit.
When the shift solenoid valve S3 is off, if resistance is 100 kohms or more, the ECM determines there is an
open in the shift solenoid valve S3 circuit (see FAIL
-SAFE CHART ).
MONITOR STRATEGY
MONITOR STRATEGY TABLE
TYPICAL ENABLING CONDITIONS
Related DTCsP0979: Shift solenoid valve S3/Range check (Low
resistance) P0980: Shift solenoid valve S3/Range
check (High resistance)
Required sensors/ComponentsShift solenoid valve S3
Frequency of operationContinuous
Duration0.064 sec. or more
MIL operationImmediate
Sequence of operationNone

Shifting from 1st to 6th is performed in combination with "ON" and "OFF" operation of the shift solenoid
valves SL1, SL2, S1, S2, S3, S4 and SR which is controlled by the ECM. If an open or short circuit occurs in
either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the
vehicle to be operated smoothly. (In case of an open or short circuit, the ECM stops sending current to the
circuit.) Fail safe function (see FAIL
-SAFE CHART ).
Fig. 148: DTC Reference Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
MONITOR DESCRIPTION
These DTCs indicate an open or short in the shift solenoid valve S4 circuit. When there is an open or short
circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores the
DTC. When the shift solenoid valve S4 is on, if resistance is 8 ohms or less, the ECM determines there is a
short in the shift solenoid valve S4 circuit.
When the shift solenoid valve S4 is off, if resistance is 100 kohms or more, the ECM determines there is an
open in the shift solenoid valve S4 circuit (see FAIL
-SAFE CHART )
MONITOR STRATEGY
MONITOR STRATEGY TABLE
TYPICAL ENABLING CONDITIONS
P0982: Range check (Low resistance)
TYPICAL ENABLING CONDITIONS TABLE - P0982
Related DTCsP0982: Shift solenoid valve S4/Range check (Low
resistance) P0983: Shift solenoid valve S4/Range
check (High resistance)
Required sensors/ComponentsShift solenoid valve S4
Frequency of operationContinuous
Duration0.064 sec. or more
MIL operationImmediate
Sequence of operationNone
The monitor will run whenever this DTC is not
present.See LIST OF DISABLE A MONITOR

valves SL1, SL2, S1, S2, S3, S4 and SR which is controlled by the ECM. If an open or short circuit occurs in
either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the
vehicle to be operated smoothly. (In case of an open or short circuit, the ECM stops sending current to the
circuit.) Fail safe function (see FAIL
-SAFE CHART ).
Fig. 153: DTC Reference Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
MONITOR DESCRIPTION
These DTCs indicate an open or short in the shift solenoid valve SR circuit. When there is an open or short
circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores the
DTC. When the shift solenoid valve SR is on, if resistance is 8 ohms or less, the ECM determines there is a
short in the shift solenoid valve SR circuit.
When the shift solenoid valve SR is off, if resistance is 100 kohms or more, the ECM determines there is an
open in the shift solenoid valve SR circuit (see FAIL
-SAFE CHART ).
MONITOR STRATEGY
MONITOR STRATEGY TABLE
TYPICAL ENABLING CONDITIONS
P0982: Range check (Low resistance)
TYPICAL ENABLING CONDITIONS TABLE - P0982
Related DTCsP0985: Shift solenoid valve SR/Range check (Low
resistance) P0986: Shift solenoid valve SR/Range
check (High resistance)
Required sensors/ComponentsShift solenoid valve SR
Frequency of operationContinuous
Duration0.064 sec. or more
MIL operationImmediate
Sequence of operationNone
The monitor will run whenever this DTC is not
present.See LIST OF DISABLE A MONITOR
Shift solenoid valve SRON

The linear solenoid valve (SLT) controls the transmission line pressure for smooth transmission operation based
on signals from the throttle position sensor and the vehicle speed sensor. The ECM adjusts the duty cycle of the
SLT solenoid valve to control hydraulic line pressure coming from the primary regulator valve. Appropriate line
pressure assures smooth shifting with varying engine outputs.
(*): 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 cycle, and B is the period of non-continuity, then Duty Ratio=A/(A+B) x 100 (%)
Fig. 158: Identifying Line Pressure Graph

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

Fig. 161: DTC Reference Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
MONITOR DESCRIPTION
The ECM calculates the amount of heat absorbed by the friction material based on the difference in revolution
(clutch slippage) between the turbine and output shaft. The ECM turns on the MIL and outputs this DTC when
the amount of heat absorption exceeds the specified value.
When the shift solenoid valve SLT remains on, oil pressure goes down and clutch engagement force decreases.
MONITOR STRATEGY
MONITOR STRATEGY TABLE
TYPICAL ENABLING CONDITIONS
ON malfunction
Related DTCsP2714: Shift solenoid valve SLT/ON malfunction
Required sensors/ComponentsShift solenoid valve SLT
Frequency of operationContinuous
DurationBetween starting in the 1st gear and stopping in the
4th gear
MIL operation2 driving cycles
Sequence of operationNone

MONITOR STRATEGY TABLE
TYPICAL ENABLING CONDITIONS
TYPICAL ENABLING CONDITIONS TABLE
TYPICAL MALFUNCTION THRESHOLDS
TYPICAL MALFUNCTION THRESHOLDS TABLE
COMPONENT OPERATING RANGE
COMPONENT OPERATING RANGE TABLE
WIRING DIAGRAM
Related DTCsP2716: Shift solenoid valve SLT/Range check
Required sensors/ComponentsShift solenoid valve SLT
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
The monitor will run whenever this DTC is not
present.See LIST OF DISABLE A MONITOR
Solenoid current cut statusNot cut
CPU command duty ratio to SLT19% or more
Battery voltage11 V or more
Ignition switchON
StarterOFF
Solenoid status (SLT) from ICFail (Open or short)
Output signal dutyLess than 100%

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