The Injection Mode setting is used to configure the ECU to the fuel injection system arrangement being used.

Refer to the Wiring and Installation Manual for more information on wiring the injector drives.

 

Injection Mode has the following options available:

 

·        Off

This turns the fuel injectors off so that the engine can be cranked without fuel entering the engine. This is useful for testing ignition or clearing a flooded engine.

 

·        Single-point Group

This mode should be used if one or two fuel injectors feed a point which is common to all cylinders. How often the injectors fire will depend upon the Injection Rate setting.

 

·        Multi-point Group

This mode should be used if each cylinder has it's own injector but there is insufficient triggering to use Sequential injection mode.

 

In this mode the injectors are fired in two out-of-phase groups. How often each group is fired is determined by the Injection Rate and Engine Type settings.

 

For example:

·Each injector bank will be fired every 360 degrees of crankshaft rotation with the Injection Rate set to 1/2 Engine Cycle and Engine Type set to 4 Stroke (Piston).

·Each injector bank will be fired every 720 degrees of crankshaft rotation with the Injection Rate set to 1 Engine Cycle and Engine Type set to 4 Stroke (Piston).

·Each injector bank will be fired every 180 degrees of crankshaft rotation with the Injection Rate set to 1/2 Engine Cycle and Engine Type set to 2 Stroke.

·Each injector bank will be fired every 360 degrees of crankshaft rotation with the Injection Rate set to 1 Engine Cycle and Engine Type set to 2 Stroke.

 

When using this mode, the number of active injection drives can be adjusted using the Active Drives setting. One group of injectors should be wired to the odd numbered injection drives (ie Inj 1, Inj 3, Inj 5, Inj 7) and the other group should be wired to even numbered injection drives (ie Inj 2, Inj 4, Inj 6, Inj 8).

 

·        Sequential

This mode should be used if each cylinder has it's own injector providing the following criteria are met.

 

1.The engine's triggering must be sufficient to calculate the current engine position during 720 degrees of crankshaft rotation. This means that a second trigger sensor is required for synchronisation and this must use an appropriate trigger wheel driven off the camshaft (or driven at half the crankshaft's rotational speed).

2.The ECU must have enough injector drives to use one drive per injector. For example, eight injector drives are required to perform sequential injection on an eight cylinder engine. It is very important that each injector drive is wired to the correct injector and the correct Firing Order is entered.

 

In this mode injectors must be wired to the injector drive corresponding to the cylinder number. ie Inj 1 = Cyl 1, Inj 2 = Cyl 2, Inj 3 = Cyl 3 etc...

 

·        Group/Staged

This mode allows control of staged injection where the engine uses primary injectors operating all the time and secondary injectors which operate only at higher load/rpm. This mode must be used for staged injection if the criteria required for Sequential injection mode are not met.

 

When using this mode, the number of active injection drives can be adjusted using the Active Drives setting. Primary injectors must be wired to the odd numbered injection drives (ie Inj 1, Inj 3, Inj 5, Inj 7) and secondary injectors wired to even numbered injection drives (ie Inj 2, Inj 4, Inj 6, Inj 8).

 

For example on a V8 engine with a primary and secondary injector per cylinder the following table shows how the injectors should be wired:

 

 

Be sure to follow the guidelines given in the injector section of the Wiring Information so that the maximum injector drive current is not exceeded.

 

 

·        Sequential/Staged

This staged injection mode uses sequential injection for both sets of injectors. Therefore the engine must have sufficient triggering and there must be two dedicated injectors for each cylinder. Each injector must be correctly wired to it's own injector drive so the ECU must have enough drives to support this mode.

 

In this mode the wiring of injector drives required is twice number of cylinders selected. The following table shows how the injectors should be wired:

 

 

 

·Sequential/Multi-Point Staged

This staged injection mode uses sequential injection for the primary injectors and group injection for the secondary injectors. The secondary injectors are always allocated two injector drives so the number of injector drives required is the number of cylinders plus two.

 

In this mode the wiring of injector drives is dependent on the number of cylinders selected. The following table shows how the injectors should be wired:

 

 

·Semi-Sequential

This mode can be used if there aren't as many injector drives as cylinders as an alternative to a group mode.

 

1.The engine's triggering must be sufficient to calculate the current engine position during 720 degrees of crankshaft rotation. This means that a second trigger sensor is required for synchronisation and this must use an appropriate trigger wheel driven off the camshaft (or driven at half the crankshaft's rotational speed).

2.The ECU must have enough injector drives to use one drive for every two cylinders/injectors. For example, four injector drives are required to perform semi-sequential injection on an eight cylinder engine. It is very important that each injector drive is wired to the correct injectors and the correct Firing Order is entered.

 

Refer to the Wiring and Installation Manual for wiring details.