Monitor Description
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.
MONITOR STRATEGY
| Related DTCs | P0230: Fuel pump control circuit continuity |
| Required Sensors/Components (Main) | Fuel pump control ECM |
| Required Sensors/Components (Related) | - |
| Frequency of Operation | Continuous |
| Duration | 2.5 seconds |
| MIL Operation | 2 operation cycle |
| Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
| Battery Voltage | 8V or more |
| Fuel Level | 15% or more |
| After engine is started | 180 seconds or more |
| Fuel pump control (low-pressure side) | ON |
TYPICAL MALFUNCTION THRESHOLDS
| Output diagnosis signal of the fuel control ECM | Low |
NOTE:
When the remaining fuel level is low, be careful of trouble in the remaining amount of fuel and the meter system (DTC B1500), because these are outside the diagnostic detection conditions.