engine LEXUS LS430 2003 Factory Repair Manual

Fig. 19: Applying Battery Positive Voltage Across Terminals
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3.INSPECT VENTILATION VALVE SUB-ASSY
a. Install a clean hose to the ventilation valve.
b. Inspect ventilation valve operation.
1. Blow air from the cylinder head side of the engine, and check that air passes through easily.

Fig. 20: Inspecting Ventilation Valve Sub-Assy
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2. Blow air from the intake manifold side of the engine, and check that air passes through with
difficulty.
If the result is not as specified, replace the ventilation valve.
c. Remove the clean hose from the ventilation valve.

Fig. 21: Blowing Air From Intake Manifold Side Of Engine
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4.INSPECT FUEL TANK CAP ASSY
a. Visually check if cap and/or gasket are deformed or damaged.
If necessar
y, repair or replace the cap.

LOCATION
Fig. 1: Identifying Engine Control System Location

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SYSTEM DIAGRAM
Engine control system is determined by the ECM based on signals from various sensors.
Fig. 2: Engine Control
- System Diagram
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Standard: 0.6 to 1.0 V
If the result is not as specified, replace the accelerator pedal position sensor.
3.INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY
Fig. 5: Connecting Hand
-Held Tester DLC3 (2 Of 2)
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a. Connect the hand-held tester (with CAN VIM) to the DLC3.
b. Turn the ignition switch ON.
c. Start and warm up the engine.
d. Connect the hand-held tester and select VVT from the ACTIVE TEST menu.
e. Check the engine speed when the OCV is operated by the hand-held tester.
OK:
ConditionSpecified Condition
VVT system is OFF (OCV is OFF)Normal engine speed
VVT system is ON (OCV is ON)Rough idle or engine stalled

Fig. 10: Inspecting Throttle Body Assy
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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
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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
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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)