LEXUS LS430 2003 Factory Repair Manual

Fig. 11: Inspecting Engine Coolant Temperature Sensor
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a. Measure the resistance between the terminals.

STANDARD:
If the result is not as specified, replace the sensor.
6.INSPECT KNOCK SENSOR
Fig. 12: Inspecting Knock Sensor

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a. Using an ohmmeter, measure the resistance between the terminals.
Standard: 120 to 280 kohms at 20°C (68°F)
If the result is not as specified, replace the sensor.
7.INSPECT RELAY (Marking: EFI MAIN, C/OPN)
ConditionSpecified Condition
Approx. 20°C (68°F)2.32 to 2.59 kohms
Approx. 80°C (176°F)0.31 to 0.326 kohms

Fig. 13: Measuring Resistance Of Relay
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a. Remove the EFI and C/OPN relays from the engine room R/B.
b. Measure the resistance of the relay.
STANDARD:
If the result is not as specified, replace the relay.
8.INSPECT RELAY (Marking: F/PMP)
TerminalsSpecified Condition
3 - 510 kohms or higher
3 - 5Below 1 ohms (when battery voltage is applied to terminals 1 and 2)

Fig. 14: Measuring Resistance Of F/Pmp Relay
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a. Remove the F/PMP relay from the engine room R/B.
b. Measure the resistance of the F/PMP relay.
STANDARD:
If the result is not as specified, replace the relay.
COMPONENTS
TerminalsSpecified Condition
3 - 4Below 1 ohms
3 - 410 kohms or higher (when battery voltage is applied to terminals 1 and 2)

Fig. 15: Identifying Throttle Body Assy Components
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REPLACEMENT
1.DRAIN ENGINE COOLANT (See ENGINE COOLANT
)
2.REMOVE V-BANK COVER
a. Remove the 2 nuts and V-
bank cover.

3.REMOVE AIR CLEANER INLET NO.1
4.REMOVE INTAKE AIR CONNECTOR PIPE
a. Disconnect the air hose and ventilation hose.
b. Remove the bolt.
c. Loosen the 2 hose clamps and remove the intake air connector pipe.
5.REMOVE THROTTLE BODY ASSY
Fig. 16: Removing Bolts, Nuts And Throttle Body And Gasket

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a. Disconnect the water bypass hose and water bypass hose No. 7.
b. Disconnect the connector.
c. Remove the 2 bolts, 2 nuts, throttle body and gasket.
6.INSTALL THROTTLE BODY ASSY

Fig. 17: Installing Bolts, Nuts And Throttle Body And Gasket
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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 )

12.INSPECT THROTTLE BODY FUNCTION (See ON-VEHICLE INSPECTION )
COMPONENTS

Fig. 18: Exploded View Of Knock Sensor -Engine Control System Components (1 Of 2)
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Fig. 19: Exploded View Of Knock Sensor - Engine Control System Components (2 Of 2)
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