LX 450 L6-4.5L (1FZ-FE) (1996)
Idle Speed/Throttle Actuator - Electronic: Component Tests and General Diagnostics
Off-Vehicle
IAC VALVE INSPECTION
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Apply battery voltage to terminal B1 and B2, and while repeatedly grounding S1 - S2 - S3 - S4 - S1 in sequence, check that the valve moves
toward the closed position.
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Apply battery voltage to terminal B1 and B2, and while repeatedly grounding S4 - S3 - S2 - S1 - S4 in sequence, check that the valve moves
toward the open position.
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If operation is not as specified, replace the IAC valve.
On-Vehicle
IAC Valve On-Vehicle Inspection
1. Inspect IAC valve for operating sound.
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Check that there is a clicking sound immediately after stopping the engine.
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If the operation is not as specified, check the IAC valve, wiring and ECM.
2. Inspect IAC valve resistance.
NOTICE: "Cold" and "Hot" in these sentences express the temperature of the coils themselves.
"Cold" is from -10°C (14°F) to 50°C (122°F) and
"Hot" is from 50°C (122°F) to 100°C (212°F).
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Disconnect the IAC valve connector.