FUEL INJECTOR INSPECTION [YF (2.0L Zetec)]

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Fuel Injector Operation Inspection

Warning
• Fuel can ignite and cause death or serious injury, and damage. To prevent this, always make sure to follow the warnings and cautions for each procedure when repairing or inspecting.

STEP

INSPECTION

RESULT

ACTION

1
Is there fuel injector operation sound from each cylinder while cranking? (Use a soundscope or equivalent tool.)
Yes
The fuel injector operation system is normal.
No
If it cannot be verified at all cylinders, go to Step 2.
If it cannot be verified at specific cylinders, go to Step 3.
2
Is the main relay operation normal?
Yes
Perform the following inspection.
• Wiring harnesses and connectors related to fuel injector power supply system
• PCM connector
• Fuel injector ground and related wiring harnesses and connectors
No
Replace the main relay.
3
Remove the fuel injector where the operation sound cannot be verified, install it to the connector where the operation sound is verified, and then crank the engine again.
Is there operation sound?
Yes
Go to the next step.
No
Replace the fuel injector.
4
Is the wiring harness or connector normal? (Open or short circuit)
Yes
Inspect for the applicable fuel injector PCM terminal voltage.
No
Repair or replace.