![]() ![]() The high pressure fuel pump actuator command is greater than or equal to 240 ° or less than or equal to 0 °. The ECM monitors the fuel rail fuel pressure sensor and the high pressure fuel pump actuator to determine if the commanded and actual pressure are within a predetermined range, or if the amount of fuel pressure correction exceeds a calibrated pressure. The ECM regulates fuel pressure by adjusting the portion of each pump stroke that provides fuel to the rail. The ECM uses the camshaft and crankshaft position sensor inputs to synchronize the high pressure fuel pump actuator with the position of each of the camshaft lobes. The high pressure mechanical fuel pump is driven by three lobes on the camshaft. When activated, the high control circuit driver energizes the high pressure fuel pump actuator and the low control circuit driver pulse-width modulates (PWM) the low control circuit to ground. When deactivated, both drivers are disabled. Both circuits are controlled through output drivers within the ECM. ![]() The ECM provides a voltage on the actuator high control circuit and ground on the actuator low control circuit. The high pressure fuel pump actuator is a solenoid valve. High pressure fuel is regulated by the high pressure fuel pump actuator, which is a part of the high pressure fuel pump. The ECM receives a varying signal voltage on the signal circuit. The engine control module (ECM) provides a 5 V reference voltage on the 5 V reference circuit and ground on the low reference circuit. The fuel rail pressure sensor detects fuel pressure within the fuel rail. ![]()
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