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Eighty-Eight Base
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Engine Control System - Tests W/Codes - DTC P1537-U1193
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DTC P1639
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DTC P1639: 5-Volt Reference No. 2 Circuit (5.7L "F" Body)
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Notes
DTC P1639: 5-Volt Reference No. 2 Circuit (5.7L "F" Body): Notes
NOTE:
For circuit reference, see appropriate wiring diagram in WIRING DIAGRAMS article.