Circuit Description

Powertrain Control Module (PCM) has 4 injector driver circuits, one for each injector. PCM monitors current in each driver circuit by measuring a voltage drop through a fixed resistor and is able to control it. Current through each driver is allowed to rise to a peak or 4-amps to quickly open injectors. Current is then reduced to one amp to keep injector open. If current cannot reach 4-amps or injector driver is shorted to voltage, DTC P0200 will set.