Kohler Command PRO ECV630 Service Manual page 76

EFI SYSTEM-BOSCH
Diagnostic Aid #8 "FUEL SYSTEM-ELECTRICAL" (no
fuel delivery)
Possible causes:
● No fuel
● Air in fuel rail
● Fuel valve shut off
● Fuel filter/line plugged
● Injector circuit(s)
"24 Pin" (MSE 1.0) Plastic-Cased ECU: Circuits 16,
17, 45, and 45A.
"32 Pin" (MSE 1.1) Plastic-Cased ECU: Circuits
14,15, and 45.
● Injector
● ECU grounds
● ECU
Diagnostic Aid #9 "FUEL SYSTEM" (fuel pressure)
Possible causes for low fuel system pressure:
● Low fuel
● Fuel filter plugged
● Fuel supply line plugged
● Fuel pump
Possible causes for high fuel system pressure:
● Pressure regulator
● Fuel return line plugged or restricted.
Diagnostic Aid #10 "BASIC ENGINE" (cranks but will
not run)
Possible causes:
● Refer to basic engine troubleshooting charts within
Troubleshooting, Electronic Fuel Injection System-
ECV EFI, and Electrical Systems.
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