LEXUS LS430 2003 Factory Repair Manual

Fig. 15: Checking Leak Detection Pump
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3. Connect the positive (+) lead of the battery to terminal 7 and the negative (-) lead to terminal
6.
4. Check that the valve is closed.
If the result is not as specified, replace the canister.
5. Install the detection pump.

Fig. 16: Checking Valve Close Position
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2.INSPECT VACUUM SWITCHING VALVE ASSY FOR ACIS
a. Measure the VSV resistance.
Standard:
RESISTANCE CONDITION
If the result is not as specified, replace the VSV ass
y.
Tester ConnectionSpecified Condition
1 - 233 to 39 ohms at 20°C (68°F)
1 - Body ground
2 - Body ground10 kohms or higher

Fig. 17: Measuring VSV Resistance
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b. Check VSV operation.

1. Check that air does not flow from port E to port F.
If the result is not as specified, replace the VSV assy.
Fig. 18: Checking VSV Operation

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2. Apply battery positive voltage across the terminals.
3. Check that air flows from port E to port F.
If the result is not as specified, replace the VSV ass
y.

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.

Fig. 22: Inspecting Fuel Tank Cap Assy
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5.INSPECT PURGE VSV
a. Measure the purge VSV resistance.
Standard:
RESISTANCE CONDITION
If the result is not as specified, replace the pur
ge VSV.
Tester ConnectionSpecified Condition
1 - 226 to 30 ohms at 20°C (68°F)
1 - Body ground
2 - Body ground10 Mohms or higher

Fig. 23: Measuring Purge VSV Resistance
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b. Check purge VSV operation.

1. Check that air does not flow from port E to port F.
If the result is not as specified, replace the purge VSV.
Fig. 24: Checking Purge VSV Operation

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2. Apply battery positive voltage across the terminals.
3. Check that air flow from port E to port F.
If the result is not as specified, replace the pur
ge VSV.