The fuel injection systems with only one injector use the current regulator principle. For this, the injector is opened using a high current, until the final stage is switched off. The signal plot for this system has two voltage spikes.
Objective:
Check control and operation of the injector.
Measurement:
Injector control signal.
Preparation:
Engine oil temperature greater than 80°C . Switch off all electrical loads. Switch off the engine and ignition.
Connections:
| INPUT A | COM/TRIGGER | INPUT B |
|---|---|---|
| Connect red measurement lead to the control wire of the connection plug of the injectors. Colour of the control wire: BL. Connect the black ground lead to ground. |
Procedure Tech 31:
- 1. Download Reference curve.
- 2. Start the engine and allow it to idle.
Reference Curve:
If the voltage spikes vary considerably, the horizontal scaling factor can be increased to 500 micro-seconds/DIV to stabilise the display of the signal plot.
