engine coolant LEXUS LS430 2003 Factory Owner's Guide

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

OFF malfunction (A)
TYPICAL ENABLING CONDITIONS TABLE - OFF MALFUNCTION A
OFF malfunction (B)
TYPICAL ENABLING CONDITIONS TABLE - OFF MALFUNCTION B
ON malfunction
TYPICAL ENABLING CONDITIONS TABLE - ON 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
Torque converter clutch pressure control solenoid
circuitNot circuit malfunction
KCS sensor circuitNot circuit malfunction
ETCS (Electric throttle control system)Not system down
Transmission shift position"D"
ECT (Engine coolant temperature)40°C (104°F) or more
Spark advance from Max. retard timing by KCS
control0° CA or more
EngineStarting
ECM selected gear4th, 5th or 6th
Vehicle speed25 km/h (15.5 mph) or more
Shift solenoid valve S1 circuitNot circuit malfunction
Shift solenoid valve S3 circuitNot circuit malfunction
Shift solenoid valve S4 circuitNot circuit malfunction
Shift solenoid valve SL2 circuitNot circuit malfunction
1 - 2 shift valveNot circuit malfunction
ECM lock - up commandON (SLU pressure: 513 kPa or more)
Duration time from lock-up on command3 sec. or more
Vehicle speedLess than 100 km/h (62.2 mph)
ECM selected gear2nd
Vehicle speed2 km/h (1.2 mph) or more
Output speed2nd --> 1st down shift point or more
Throttle valve opening angle6.5% or more (Varies with engine speed)
ECM lock - up commandOFF (SLU pressure: less than 4 kPa)
Duration time from lock-up on command3 sec. or more

Fig. 10: Inspecting Throttle Body Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Measure the resistance between the terminals.
STANDARD:
If the result is not as specified, replace the throttle body assy.
5.INSPECT ENGINE COOLANT TEMPERATURE SENSOR
Tester ConnectionConditionSpecified Condition
2 (M+) - 1 (M-)20°C (68°F)0.3 to 100 ohms
5 (VC) - 3 (E2)20°C (68°F)1.2 to 3.2 kohms

Fig. 11: Inspecting Engine Coolant Temperature Sensor
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Measure the resistance between the terminals.

Fig. 15: Identifying Throttle Body Assy Components
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
REPLACEMENT
1.DRAIN ENGINE COOLANT (See ENGINE COOLANT
)
2.REMOVE V-BANK COVER
a. Remove the 2 nuts and V-
bank cover.

Fig. 17: Installing Bolts, Nuts And Throttle Body And Gasket
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Install a new gasket and the throttle body with the 2 bolts and 2 nuts.
Torque: 18 N.m (185 kgf.cm, 13 ft.lbf)
b. Connect the water bypass hose and water bypass hose No. 7.
c. Connect the connector.
7.INSTALL INTAKE AIR CONNECTOR PIPE
a. Install the intake air connector pipe with the bolt and 2 hose clamps.
Torque:
4.0 N.m (41 kgf.cm, 35 in..lbf) for hose clamp
5.0 N.m (51 kgf.cm, 44 in..lbf) for bolt
b. Connect the air hose and ventilation hose.
8.INSTALL AIR CLEANER INLET NO.1
9.INSTALL V-BANK COVER
Torque: 5.0 N.m (51 kgf.cm, 44 in..lbf)
10.REFILL ENGINE COOLANT (See ENGINE COOLANT
)
11.CHECK FOR ENGINE COOLANT LEAKS (See ON
-VEHICLE INSPECTION )

REPLACEMENT
1.DRAIN ENGINE COOLANT (See ENGINE COOLANT
)
2.WORK FOR PREVENTING GASOLINE FROM SPILLING OUT (See PRECAUTION
)
3.DISCONNECT BATTERY NEGATIVE TERMINAL
4.REMOVE V-BANK COVER
5.REMOVE INTAKE AIR CONNECTOR PIPE
6.REMOVE THROTTLE BODY ASSY (See REPLACEMENT
)
7.REMOVE INTAKE MANIFOLD ASSY
Fig. 20: Disconnecting VSV Connector For EVAP

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the fuel pipe sub-assy No. 2 from the fuel main tube (see PRECAUTION
).
b. Disconnect the VSV connector for EVAP.
c. Disconnect the EVAP hose from the VSV for EVAP.
d. Remove the bolt, disconnect the VSV for EVAP from the upper intake manifold.
e. Remove the bolt and V-bank cover bracket No. 2.
f. Remove the bolt and V-
bank cover bracket No. 3.

16.REFILL ENGINE COOLANT (See ENGINE COOLANT )
17.CHECK FOR ENGINE COOLANT LEAKS (See ON
-VEHICLE INSPECTION )
COMPONENTS

INSPECTION
1.INSPECT ENGINE COOLANT (See REPLACEMENT
)
2.INSPECT ENGINE OIL (See ON
-VEHICLE INSPECTION )
3.INSPECT BATTERY (See REPLACEMENT
)
4.INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSY
5.INSPECT SPARK PLUG (See REPLACEMENT
)
6.INSPECT FAN AND GENERATOR V BELT
HINT:
Use of the automatic tensioner has made tension and flexibility measurements unnecessary.
a. Check that the indicator mark on the automatic tensioner is within range A as shown in the
illustration.
b. When the mark is out of the standard range, replace the V belt with a new one.

Fig. 33: Exploded View Of Partial Engine Assy Components (15 Of 15)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
REPLACEMENT
1.WORK FOR PREVENTING GASOLINE FROM SPILLING OUT (See PRECAUTION
)
2.DISCONNECT BATTERY NEGATIVE TERMINAL
3.REMOVE HOOD SUB-ASSY (See OVERHAUL
)
4.REMOVE V-BANK COVER
5.REMOVE AIR CLEANER INLET NO.1
6.REMOVE INTAKE AIR CONNECTOR PIPE
7.REMOVE AIR CLEANER ASSY
8.REMOVE FRONT WHEEL
9.REMOVE ENGINE UNDER COVER NO.1
10.REMOVE ENGINE UNDER COVER NO.2
11.DRAIN ENGINE OIL
12.DRAIN ENGINE COOLANT