Vauxhall Workshop Service and Repair Manuals

Test

Work Order Description

Nominal Value

• Engine idling
• Press corresponding key in the system main menu to call up ECU Control Tests, select the desired test and confirm with ENTER . Follow the instructions in the diagnostic tester display.
• Press corresponding soft key to turn off the selected fuel injector for 30 s .

Concerned injection valves are switched off.

Note:

This test helps to analyse engine compression. All fuel injectors are cut-off one after another. Each time an injection valve is cut-off, the engine must move the corresponding piston against the compression pressure. This leads to a reduction in torque and performance, and the engine speed drops accordingly. The engine speed reduction should be identical for each injector, since the compression of all cylinders is nearly the same as long as the system is working properly.