Vauxhall Workshop Service and Repair Manuals

Injector (Single-point Fuel Injection)  

The fuel injection systems with only one injector use the current regulator principle. For this, the injector is opened using a high current level (rapid opening) and then held open using a minimal current, until the final stage is switched off. The signal plot for this system has two voltage spikes.
Measurement:	Injector control signal.
Check Objective:	Checking control and operation of the injector.

Preparation  

Engine oil temperature > 80 ° C. Switch off all electrical loads. Switch off the engine and ignition.  

Connections  

INPUT A	COM/TRIGGER
Connect the red measurement lead to pin 1 on the connection plug of the injectors.
Colour of the control wire: BL
Connect ground lead to ground.

Procedure  

Start the engine and allow it to idle.  

Reference Curve     Notice:  If the voltage spikes vary considerably, the horizontal scaling factor can be increased to 500 μ s/DIV to stabilise the display of the signal plot.

 

Fault Diagram 1   Symptoms:   Injection period too long ( > 1.9 ms).

Possible Causes	Countermeasures
Exhaust too lean	Check Lambda sensor signal.
	If ok, check and repair electronic engine system as specified in checking procedure.

 

Fault Diagram 2   Symptoms:   Injection period too short ( < 0.1 ms).

Possible Causes	Countermeasures
Exhaust too rich	Check Lambda sensor signal.
	If ok, check and repair electronic engine system as specified in checking procedure.