Mike's Workshop Manuals
: Service manuals for every vehicle
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Hummer
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2009
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H3 Alpha
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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 - 5.3L - DTC P0315 To DTC P064A
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DTC P0685 or P0690
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DTC Descriptors
DTC Descriptors
DTC P0685
Engine Controls Ignition Relay Control Circuit
DTC P0690
Engine Controls Relay Feedback Circuit High Voltage