Fuel Injector Balance Test With Tech 2

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

CIRCUIT DESCRIPTION
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
The numbers below refer to the step numbers on the diagnostic table.
3. The engine coolant temperature must be below the operating temperature in order to avoid irregular fuel pressure readings due to Hot Soak fuel boiling.
4. Tests the fuel system for the ability to reach a specified fuel pressure range.
5. Tests the fuel system for the ability to maintain a specified fuel pressure range.
6. If the pressure drop value for each fuel injector is within 10kPa (1.5 psi)of the average pressure drop value, the fuel injectors are flowing properly. Calculate the pressure drop value for each fuel injector by subtracting the second pressure reading from the first pressure reading.