| | Switch 2 | Switch 3 | Switch 4 (MSB) | Assigned Zones | | :--- | :--- | :--- | :--- | :--- | | ON | OFF | OFF | OFF | Zones 5-8 | | OFF | ON | OFF | OFF | Zones 9-12 | | ON | ON | OFF | OFF | Zones 13-16 | | OFF | OFF | ON | OFF | Zones 17-20 | | ON | OFF | ON | OFF | Zones 21-24 |
: Uses a helical notch on the plunger to alter effective displacement, thereby controlling the amount of fuel delivered to the injectors. bosch pes4a manual