Fuel Injector Balance Test with Special Tool
WARNING: This page is about a different variant/trim than selected.
- Set the amperage supply selector switch on the fuel injector tester to the Balance Test 0.5-2.5 amp position.
- Disconnect the multi-way harness connector of the fuel injectors.
- Connect the J 39021
using the J 35616
to the ignition circuit terminal A and the control circuit of the appropriate fuel injector listed below:
- Injector 1 terminal B
- Injector 2 terminal C
- Injector 3 terminal D
- Injector 4 terminal E
- Command the fuel pump relay ON and then OFF three times with a scan tool. On the last command, as the fuel pressure begins to slowly degrade and stabilize, select a fuel pressure within 34 kPa (5 psi) of the maximum pump pressure. Record this fuel pressure. This is the starting pressure at which you will pulse each injector.
- Command the fuel pump relay ON one more time and energize the fuel injector by depressing the Push to Start Test button on the J 39021 at the previously selected pressure.
- After the injector stops pulsing, select Min from the Display Mode and record the Min pressure.IMPORTANT: New test results will not be recorded if the Min/Max results are not cleared after each injector is tested.
- Clear the Min/Max results.
- Select Normal from the Display Mode.
- Repeat steps 3 and 5 through 8 for each fuel injector.
- Perform the Pressure Drop Calculation.