Intake Manifold Runner Flap Monitoring

.17.01.00 Intake Manifold Runner Flap Monitoring

.17.01.01 General Description
To improve the robustness of the combustion in terms of fuel preparation, especially at low load conditions, an electrical motor driven 2-point intake manifold runner flap system is introduced.
The target position of the flaps is shown in the engine operation map beside.







The intake manifold runner flaps are located directly in the inlet area of each cylinder. The position control sensor is located inside of the actuator unit. The spring-driven default position for the flaps is -> open.

.17.01.02 Monitoring function description
Component:
Several electrical and rationality checks are implemented to monitor the correct runner flap position and system reaction. The main signal for those monitor is the sensor position signal voltage

Electrical fault
DTC's P2008
Malfunction 1 Signal duty cycle > 80% and ECM power stage failure
Malfunction 2 Deviation > 5% and ECM power stage failure
Examples: Open circuit, shorted wires, internal hardware failure

Rationality check
DTC's P2015
Malfunction 1 Signal duty cycle > 80%
Malfunction 2 Deviation > 5%
Examples: High friction, stuck flaps,







Electrical fault
DTC's P2016 / P2016
Malfunction 1 Short to ground, open circuit / Short to battery

Rationalty check
DTC's P2016 / P2016 (once per driving cycle)
Malfunction 1 Sensor sent signal below mechanical linkage but no
electrical fault.
Malfunction 2 Sensor sent signal above mechanical linkage but no
electrical fault.
Function description After ignition off the flaps are in the default open position.
During keep alive time, an intrusive check will be performed:
1. Flaps commanded closed: mechanical limit < 3.6V expected
2. Flaps commanded open : mechanical limit > 1.3 V is expected
Example for failure broken shaft