Vacuum Actuated WASTEGATE System
The 3.5L GTDI was introduced with a mechanical-pneumatic boost pressure controller as described in the previous service information. Boost pressure is limited mechanically via a diaphragm and spring. Boost pressure can be increased within a limited range by controlling a wastegate pneumatic solenoid.
The 2.0L GTDI was introduced with a vacuum actuated wastegate. This permits control of the wastegate position at all engine conditions. The wastegate can be opened at some part load conditions to reduce the backpressure on the engine. This reduces pumping losses and improves efficiency and fuel economy. A vacuum sensor was added to improve the accuracy and robustness of the control system.
| DTCs | P0245 Turbocharger/Supercharger Wastegate Solenoid A Low P0246 Turbocharger/Supercharger Wastegate Solenoid A High |
| Monitor Execution | Continuous |
| Monitor Sequence | None |
| Monitoring Duration | 2 -3 seconds |
| PCM smart driver hardware detects faults for circuit short to battery, short to ground, and open circuit. Fault status reported to PCM to set appropriate DTC. |
Under steady conditions, the control pressure error should be small. Control pressure lower than expected could indicate an air leak between wastegate canister and the wastegate solenoid, and insufficient source of vacuum, or that the wastegate solenoid is stuck off. Control pressure higher than expected could indicate that the wastegate solenoid is stuck on
| DTCs | P1015 Wastegate Control Pressure Lower Than Expected P1016 Wastegate Control Pressure Lower Than Expected |
| Monitor Execution | Continuous |
| Sensors OK | No P100F, P1011, P1012, P1013, P0245, P0246 DTCs |
| Monitor Sequence | None |
| Monitoring Duration | 5 Seconds |
| Entry Condition | Minimum | Maximum |
| Desired wastegate control pressure is stable: (desired pressure - expected pressure). |
0.5 in Hg |
| P1015 - Wastegate control pressure error > 3 in Hg P1016 - Wastegate control pressure error > 5 in Hg |