SYSTEM/ACTUATOR TESTS
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A fuel pressure gauge (purchased separately) is required to
perform this function.
1. Select Fuel Injector Balance in the ECM Special Functions menu,
then press ENTER .
n An “instructional” screen displays. Prepare the vehicle for test as
directed:
Choose Next as necessary to scroll the “instructional”
screen.
- Ensure all fuel lines are connected.
- Connect the fuel pressure gauge to the fuel line.
n The Select Injector screen displays.
2. Select the injector you wish to test, then press ENTER .
n The Injector Pressure screen
displays.
3. Note and record the fuel pressure
reading for the selected injector, then
choose Pulse Injector to pulse the
injector.
n The Injector Pressure Drop screen
displays.
4. Note and record the fuel pressure drop
for the selected injector, then choose
Continue to return to the Select Injector
screen.
n Repeat steps 2 through 4 for
additional injectors, as desired.
5. Choose Exit to return to the ECM
Special Functions menu.
Cylinder Power Balance
The Cylinder Power Balance function lets you disable a selected fuel
injector to note the resulting power drop.
1. Select Cylinder Power Balance in the ECM Special Functions menu,
then press ENTER .
n An “instructional” screen displays. Prepare the vehicle for test as
directed:
- Set the parking brake.
- Block all drive wheels.
- Start and idle the engine.
- Make sure the A/C system is off.
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