Vauxhall Workshop Service and Repair Manuals

Injector (Multi-point Fuel Injection)  

This multi-point fuel injection system is a conventional fuel injection system with a cut-off control system. In this case, the signal plot only has one voltage spike.
Measurement:	Injector 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 the injector connection plug.
Control lead colour: BRXX
Except SINTRA: XXSW
Connect ground lead to ground.

Procedure  

Start the engine and allow it to idle.  

Reference Curve     Notice:  If there is considerable variation of the voltage peaks, the horizontal scaling factor can be increased up to 500 μ s/DIV to stabilise the display of the signal plot.

 

Fault Diagram 1   Symptoms:   Injection period too short ( > 4.5 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 ( < 1.5 ms).

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