Find below an example of how to connect a 4-cylinder engine injection system using batch fire injection (injectors paired) and sequential.
By default the ecu will fire the outputs in sequential mode according to the ignition order selected on RM-Tuner as long as a CAM signal (or main trigger running at CAM speed) is present to detect the engine phase.
When there is no CAM signal present the ECU will automatically fire the injectors in semi-sequential mode, the wiring of the injectors always remains the same.
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injection_wiring.pdf