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Chevy Truck
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2002
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W 3500 Tiltmaster L4-4.8L DSL Turbo
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Repair and Diagnosis
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A L L Diagnostic Trouble Codes ( DTC )
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Testing and Inspection
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Manufacturer Code Charts
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DTC P42
DTC P42
DTC-P42 QOS Relay Control Circuit High Voltage
location of Relay
Inspection for QOS power cut relay
Resistance value.
