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Checking knock control system
Checking Hall sender
The Hall sender indicates the ignition position for cylinder 1.
If the Hall sender fails to function, the knock control is switched off and the ignition timing is retarded slightly because the signals can no longer be assigned to the cylinders.
Even without a signal from the Hall sender, the engine will continue to run and can also be restarted.
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‒ With the twin spark ignition system an ignition spark is produced for each cylinder after every engine revolution, and not after alternate revolutions as is normally the case.
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‒ The fact that the control unit is out of phase by one engine revolution does not have any noticeable effect on the injection system. If this happens, the fuel is injected "upstream" (before the closed inlet valve) instead of while the inlet valve is open. This has only a minor influence on the quality of the air/fuel mixture.
Note on signal testing with an oscilloscope:
The centre point of the window of the Hall sender must lie on the third falling flank of the engine speed signal after the reference mark gap.
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