1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 316Get this manual
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FUEL INJECTION SYSTEM TROUBLESHOOTING
150-170 (66-77 C) Varies with Ambient Temperature .4 to .8 Volts 0-1 1-3 Volts or (45-55 kPa) (Depends on Vacuum and Baro Pressure) 3-5 Volts (Depend