Fuel Injector Balance Test With Tech 2

FUEL INJECTOR BALANCE TEST WITH TECH 2

CIRCUIT DESCRIPTION

Fuel Injector Balance Test Example (Actual Results May Vary):

The scan tool first energizes the fuel pump and then the injectors 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

Step 1 - Step 5:

Step 6 - Step 8:

The numbers below refer to the step numbers 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. This step tests the ability of the fuel system to produce pressure within a specified range necessary for the correct engine performance.
5. This step tests the ability of the fuel system to maintain fuel pressure after the pump stops.
6. If the pressure drop value for each fuel injector is within 20 kPa (3 psi) of the average pressure drop value, the fuel injectors are flowing properly.