LEXUS LS430 2003 Factory Repair Manual

SHIFT SOLENOID VALVE (S1) - RESISTANCE TABLE
c. Connect positive (+) lead to the terminal of solenoid connector, negative (-) lead to the solenoid
body.
OK:
The solenoid makes an operating noise.
Fig. 137: Inspecting Shift Solenoid Valve (S1)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE SHIFT SOLENOID VALVE (S1)
OK: REPAIR OR REPLACE TRANSMISSION WIRE (See step 5 on REPLACEMENT
)
DTC P0976, P0977: SHIFT SOLENOID "B" CONTROL CIRCUIT LOW/HIGH (SHIFT SOLENOID
VALVE S2)
Tester ConnectionSpecified Condition 20°C (68°F)
Solenoid Connector (S1) - Solenoid Body (S1)11 to 15ohms

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

P0977: Range check (High resistance)
TYPICAL ENABLING CONDITIONS TABLE - P0977
TYPICAL MALFUNCTION THRESHOLDS
P0976: Range check (Low resistance)
TYPICAL MALFUNCTION THRESHOLDS - P0976
P0977: Range check (High resistance)
TYPICAL MALFUNCTION THRESHOLDS TABLE - P0977
COMPONENT OPERATING RANGE
COMPONENT OPERATING RANGE TABLE
WIRING DIAGRAM
Fig. 139: DTC P0976, P0977 - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
The monitor will run whenever this DTC is not
present.See LIST OF DISABLE A MONITOR
Shift solenoid valve S2ON
The monitor will run whenever this DTC is not
present.See LIST OF DISABLE A MONITOR
Shift solenoid valve S2OFF
Shift solenoid valve S2 resistance8 ohms or less
Shift solenoid valve S2 resistance100 kohms or more
Shift solenoid valve S2Resistance: 11 to 15 ohms at 20°C (68°F)

INSPECTION PROCEDURE
1.INSPECT TRANSMISSION WIRE (S2)
a. Disconnect the transmission wire connector from the transmission.
b. Measure the resistance according to the value(s) in the table below.
Fig. 140: Identifying Transmission Wire Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Standard:
TRANSMISSION WIRE (S2) - 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.
Tester ConnectionSpecified Condition 20°C (68°F)
15 - Body ground11 to 15ohms

b. Disconnect the connector from the ECM.
c. Measure the resistance according to the value(s) in the table below.
Fig. 141: Disconnecting Connector From ECM

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Standard:
TRANSMISSION WIRE - ECM - RESISTANCE TABLE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See ELECTRONIC CIRCUIT
INSPECTION PROCEDURE )
OK: Go to next step
OK: REPLACE ECM (See REPLACEMENT
)
3.INSPECT SHIFT SOLENOID VALVE (S2)
a. Remove the shift solenoid valve S2.
Tester ConnectionSpecified Condition 20°C (68°F)
E6 - 18 (S2) - Body ground11 to 15ohms

b. Measure the resistance according to the value(s) in the table below.
Standard:
SHIFT SOLENOID VALVE (S2) - RESISTANCE TABLE
c. Connect positive (+) lead to the terminal of solenoid connector, negative (-) lead to the solenoid
body.
OK:
The solenoid makes an operating noise.
Fig. 142: Inspecting Shift Solenoid Valve (S2)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE SHIFT SOLENOID VALVE (S2)
OK: REPAIR OR REPLACE TRANSMISSION WIRE (See step 5 on REPLACEMENT
)
Tester ConnectionSpecified Condition 20°C (68°F)
Solenoid Connector (S2) - Solenoid Body (S2)11 to 15ohms

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

P0979: Range check (Low resistance)
TYPICAL ENABLING CONDITIONS TABLE - P0979
P0980: Range check (High resistance)
TYPICAL ENABLING CONDITIONS TABLE - P0980
TYPICAL MALFUNCTION THRESHOLDS
P0979: Range check (Low resistance)
TYPICAL MALFUNCTION THRESHOLDS TABLE - P0979
P0980: Range check (High resistance)
TYPICAL MALFUNCTION THRESHOLDS TABLE - P0980
COMPONENT OPERATING RANGE
COMPONENT OPERATING RANGE TABLE
WIRING DIAGRAM
The monitor will run whenever this DTC is not
present.See LIST OF DISABLE A MONITOR
Shift solenoid valve S3ON
Battery voltage8 V or more
Ignition switchON
StarterOFF
The monitor will run whenever this DTC is not
present.See LIST OF DISABLE A MONITOR
Shift solenoid valve S3OFF
Battery voltage8 V or more
Ignition switchON
StarterOFF
Shift solenoid valve S3 resistance8 ohms or less
Shift solenoid valve S3 resistance100 kohms or more
Shift solenoid valve S3Resistance 11 to 15ohms at 20° C (68° F)

Fig. 144: DTC P0979, P0980 - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT TRANSMISSION WIRE (S3)
a. Disconnect the transmission wire connector from the transmission.
b. Measure the resistance according to the value(s) in the table below.

Fig. 145: Identifying Transmission Wire Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Standard:
TRANSMISSION WIRE (S3) - 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)
7 - Body ground11 to 15ohms