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Cadillac
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2003
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CTS Automatic
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Self-Diagnostics
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Diagnostic Tests
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DTC P0662: Intake Manifold Tuning Valve Control Circuit High
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Conditions For Running DTC
Conditions For Running DTC
The engine speed is more than 40 RPM.
The battery voltage is more than 8.05 volts and less than 18 volts.
The ECM must change the state of the IMT solenoid from OPEN to CLOSED.