Monitor Description: Notes

For monitoring the fuel pump (low-pressure side) circuit, the ECM checks the fuel pump control signal (FPC) and the diagnosis signal (FPCDG). The FPC voltage fluctuates between approx. 0 - 12 V (duty signal).

Based on the status of the fuel pump control ECM, the FPCDG voltage fluctuates between approx. 0 - 12 V. Therefore, the ECM compares the fluctuations of the FPC voltage and the FPCDG voltage, and determines if there is a malfunction in the fuel pump (low-pressure side) circuit. If the ECM determines that there is a malfunction in the fuel pump (low-pressure side) circuit, then the DTC is immediately recorded.