Vauxhall Workshop Service and Repair Manuals

B-08, F8: ECU CONTROL TEST  

B-08, F8: ECU CONTROL TEST
Test	Work Order Description		Nominal Value
T01	Tester Display   INJ.CONTROL
	•  Engine running at idle speed, operating temperature   •  Throttle valve is closed (idle speed)   •  Vehicle stationary   •  All consumers turned off   •  Selector lever in position P   •  Press corresponding key in the system main menu to call up ECU Control tests, select the desired test and confirm with YES. Follow the instructions in the diagnostic tester display.   •  Press F9 key to activate the snapshot mode.   •  Press keys YES and NO to view the corresponding datalist parameters.		Test okay?
	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 engine speed drops accordingly. The engine speed reduction must be identical for each injector, since the compression of all cylinders is nearly the same as long as the system is working properly. The electronic control of the engine immediately responds to the disabled cylinder by increasing the injection time of the remaining injectors and by opening the idle air controller. In order to avoid this, the spark angle and the idle air controller position are adjusted to a fixed value. Engine speed is increased to approximately 1200 rpm, with oxygen sensor closed loop control working normally.
	The test should only be started when the cooling fan is not running, otherwise the engine speed may be lowered by approximately 100 rpm.   When one cylinder has been cutoff, engine speed will drop by approximately 100 rpm. If the cooling fan operates while the cylinder is being cut off, this may further reduce engine speed by an additional 100 rpm. When an injector is switched off, unburnt oxygen from the cylinder will reach the exhaust pipe. This lean combustion will be reflected by the oxygen sensor showing a permanent low voltage value.
	Concerned Terminals:   -
	Yes: T02	No: C-14