1.13.9.1 Description and diagnosis of this module
If a malfunction of one of the valvetronic components is detected, the management tries to drive both actuators to their end positions (limp-home = full valve lift). In this case, the charge control will be managed by the throttle. If one actuator cannot reach its end position, the valvetronic tries to ensure, that the load on both banks reaches a common level. Any reduction of valve lift will lead to a reduction of the engine power. A DTC is stored, if one of both actuators was not able to reach its end position.
There will be a distinction, whether this error was detected directly by a comparison with the actuator angle or indirectly by checking the engine roughness or comparison of load or comparison of air mass flow. This balance test is carried out for thermal protection of the catalyst. If the air charge distribution on both cylinder-banks is unequal, the fuel system runs a danger of delivering an incombustible mixture.
Error Symptoms:
| Valvetronic malfunction was detected and limp home mode is set. There is no information about the actuator's end position and the engine roughness is detected as too high. | P1061 |
| Valvetronic malfunction was detected, limp home mode is set, one of the actuators didn't reach its end position (sensor position available) and actuator angle < 150°. | P1062 |
| Valvetronic malfunction was detected and limp home mode is set. There is no information about the actuator's end position and the comparison of full load with an internal characteristic value is detected as too low or the comparison of measured air mass flow and calculated air mass flow through the throttle valve in the complete engine is detected as too high. | P1063 |