LEMON Manuals
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Hummer
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2007
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H2 4D Utility Pickup
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls And Fuel - 6.0L - DTC P0455 To DTC U0107
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DTC P1400
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Circuit/System Verification
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Circuit/System Verification
Allow the engine to cool.
Start and idle the engine for at least 2 minutes.
DTC P1400 should run and pass.