Mercury 3.0 Liter Service Manual download pdf (Page 79)

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3-23

Injector Test (Cont.)

5) Attach the Fuel Pressure Gauge to the fuel pressure test fitting. Turn the

ignition key switch to the ON position and observe the fuel pressure

reading after the pump driver times out (15 to 30 seconds).

6) Refer to the following section labeled Multi Test. From the Marine

Diagnostic menu screen, select 3–Injector Test. From the Injector Test

menu, select 1 –Multi Pulse Test. Use the ∀ key to increment the number

of cycles in test to 50. Select the Ο key to move to the total on-time-

milliseconds. Next use the ∀ key to adjust on-time to 300. For all outboard

products test data is based on the previous settings.

7) Press the enter key. The DDT will cycle the injector pair selected. Make

note as to the drop in pressure reading on the fuel pressure gauge.

8) Next, turn the ignition key switch to the OFF position and then back to ON

in order to repressurize the fuel rail. Remove the green/white pigtail wire

from the injector harness and select another pair and repeat step 7.

Repeat this for all injector pairs and take note of the average drop in fuel

pressure for each pair tested. Any differences greater than 3 PSI may

indicate a problem with the injector(s) or the injector filter(s). The manifold

may be disassembled and the test can be performed to isolate a single

injector by unplugging the suspect injector and repeating the test to isolate

the problem injector.

Notes

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Mercury 3.0 Liter Service Manual Page 79