There are engines on the market without vacuum in the intake manifold (valvetronic type: BMW, VOLVO). The lack of negative pressure makes it difficult to properly calibrate the gas system. For the calibration to run correctly, it is necessary to use the PPO-1-12V converter. The device is used to generate the load signal for the DIEGO gas injection system based on the signal from the air flow meter.
The small dimensions of the device and hermetic casing allow the device to be installed in the engine compartment, where the emulator may be exposed to weather conditions.