Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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.
| 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 |
| Entry Condition | Minimum | Maximum |
| Fuel Level | 15% |
| 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 |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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