Fuel Rail Pressure Control (CSER)
While not used in this first GTDI application, it is possible that during catalyst heating (CSSER) the fuel injection timing may be unique to this mode. In future cases, a two squirt injection may be used. One of those injection squirts would occur during the compression stroke. Compression injection is only allowed within a calibrated fuel pressure "window". The P053F detection monitors the time fraction within that fuel pressure window.
FUEL RAIL PRESSURE CONTROL (CSER) FUNCTIONAL CHECK OPERATION
| DTCs | P053F (Cold Start Fuel Pressure Control Performance) |
| Monitor execution | During CSER |
| Monitor Sequence | P0087 and P0088 must pass before setting P00C6 or P053F |
| Sensors/Actuators OK | FLI, FRP, FVR,, Lift Pump |
| Monitoring Duration | Entire CSER period |
TYPICAL FUEL RAIL PRESSURE CONTROL (CSER) FUNCTIONAL CHECK ENTRY CONDITIONS
| Entry Condition | Minimum | Maximum |
| Fuel Level | 15% |
TYPICAL FUEL RAIL PRESSURE CONTROL (CSER) FUNCTIONAL CHECK MALFUNCTION THRESHOLDS
| Time in Fuel Injection Pressure Window / CSER Duration > 0.70 Fuel Injection Pressure Window defined as follows: Minimum Fuel Pressure to Support Desired Injection Mode <= Fuel Pressure Actual Fuel Pressure Actual <= Maximum Fuel Pressure to Support Desired Injection Mode |