Fuel Injection System
8.19
Fichtâ Fuel Injection System -- Action Steps -- Fuel System / Fuel Injectors
5. If fuel pump will not run, check fuel pump circuit:
A. Verify that battery voltage is present on RED/W wire at all times.
B. Ground BRN wire; pump should activate.
C. Use diagnostic software to check fuel pump circuit. If pump will run using diagnostic software, the
EMM is not the fault. Continue to check circuit harness and circuit breaker. Verify continuity on RED/W
and BRN circuits.
D. If pump will run using diagnostic software, but not while engine turn over, check the resistance of the
Crank Position Sensor (CPS). If out of specification, replace sensor.
NOTE: Remember these important facts regarding the fuel pump:
S The CPS “activates” the EMM fuel pump circuit when it reads that the flywheel is rotating. When
the EMM “senses” that the flywheel is rotating and the lanyard is installed, the EMM grounds the
BRN wire and the fuel pump turns on.
S Battery voltage should always be present on the RED/W circuit.
S Check the 15A circuit breaker for proper operation.
S If the fuel pump is running, the fuel lines should visibly flex at initial start--up. You should be able
to feel fuel pressure inside the fuel lines when the pump is running.
S If the diagnostic software can turn the fuel pump on and off, the EMM circuit is not at fault, unless
the EMM cannot interpret the signal generated by the CPS.
If fault is suspected with the fuel injectors, follo w these steps:
1. Use the diagnostic software to test each fuel injector. If the injectors fire, the EMM -- Injector circuits are not at
fault. Continue testing.
2. If the fuel injector(s) will not fire during the diagnostic tests, check each fuel injector circuit for continuity
between the EMM and individual injector.
3. If fuel injector circuits are ok, verify that the 8 pin EMM power connector is “jumping” battery voltage from the
RED/PUR circuit to the W/RED circuit. During the diagnostic session, there should be battery voltage on each
of the W/RED wires leading to each injector. Trace each circuit if voltage is not present.
4. If fuel injectors will fire during the diagnostic session, but not while attempting to start the watercraft, verify that
12vDC is present on ALL W/RED circuits with the 8 pin harness installed in the EMM. Trace W/RED circuit if
voltage is not present.
5. During cranking, Vdc to each injector should “step--up” from 12 to approximately 22 Vdc. If not, perform an AC
voltage test on the stator coils. Replace stator if Vac is lower than specifications.
6. Disconnect an individual injector from its harness and attempt to start the engine. If the engine starts, or
voltage increases to the other injector(s) to approximately 22 Vdc, check the stator and/or regulator inside the
EMM.
7. To check the voltage regulator/rectifier inside the EMM, obtain a known good EMM if possible. Connect the 8
pin and 12 pin harnesses of the SUSPECT watercraft to the good EMM. Leave the 40 pin connected to the
SUSPECT EMM. Attempt to start the watercraft. If problem with low voltage is resolved, replace the EMM.
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