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GMC Truck
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1994
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G 3500 1 Ton Van V8-350 5.7L
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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 66
DTC 66
Fig. 154 Codes 65 & 66: Open Or Shorted Pump Motor Relay:
