Fuel Injector Balance Test With Tech 2

FUEL INJECTOR BALANCE TEST WITH TECH 2

SYSTEM DESCRIPTION

Fuel Injector Balance Test With Tech 2:

The scan tool is first used to energize the fuel pump relay. The scan tool is then used to pulse each injector for a precise amount of time allowing a measured amount of fuel into the manifold. This causes a drop in system fuel pressure that can be recorded and used to compare each injector.

TEST DESCRIPTION

Steps 1-6:

Steps 7-9:

The number below refers to the step number on the diagnostic table.
3. The engine coolant temperature (ECT) must be below the operating temperature in order to avoid irregular fuel pressure readings due to hot soak fuel boiling.
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 operating range of this fuel system.
6. This step checks for a steady fuel pressure reading. A steady fuel pressure reading indicates that the fuel system is operating properly.
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.