2003 LEXUS LS430 engine

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

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 )

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