Fuel Injector Balance Test

Injector Balance Test Example:

INJECTOR BALANCE TEST EXAMPLE

TEST DESCRIPTION

Steps 1-3:

Steps 4-10:

The numbers below refer to the step numbers on the diagnostic table.
4. The engine coolant temperature must be less than the operating temperature in order to avoid irregular fuel pressure readings due to hot soak fuel boiling.
5. This step checks that the fuel pressure is within the specified range.
6. This step checks for a steady fuel pressure reading.
7. The fuel injectors are flowing properly if the pressure drop value for each fuel injector is within 10 kPa (1.5 psi) of the average pressure drop value. Calculate the pressure drop value for each fuel injector by subtracting the second pressure reading from the first pressure reading. Refer to the examples in the preceding table.