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Lexus
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1993
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SC 400
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Tests W/O Codes
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Symptoms
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Engine Stall
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Engine Stall During A/C Operation
Engine Stall During A/C Operation
Check idle speed control valve circuit.
Check A/C signal circuit. Ensure A/C clutch is engaged.
Check ECM ground circuit.