Fault handling

The charge-air-pressure control is monitored for the following faults:

• Positive and negative control deviation
• Fault in activation of the charge-air pressure actuator
• Defect in the charge-air pressure actuator, e.g. blocked or mechanically defective
• Dropped charge air hose

Consequences of fault occurring in the charge-air-pressure control system:

• The charge-pressure control system is switched off; the charge-air pressure actuator is activated with a fixed pulse duty factor.
• Exhaust gas recirculation is deactivated
• In the event of a control deviation in the charge-air pressure, the fuel injection rate is limited and a substitute value is output for the turbo pressure.

  Charge-air-pressure control is also deactivated when the following faults occur:

• Fault in the exhaust-gas recirculation
• Fault on the charge-air pressure sensor
• Fault in the crankshaft sensor
• Fault in the accelerator pedal module
• Fault in the air-mass sensor
• Fault at terminal 15 or wake-up signal
• Fault on the flow regulating valve

If a defect is detected on the charge-air pressure sensor, the DDE control unit reacts as follows:

• Charge-air-pressure control is deactivated
• Exhaust gas recirculation is deactivated

If a defect is detected on the charge-air temperature sensor, the DDE control unit reacts as follows:

• Charge-air-pressure control is deactivated
• Exhaust gas recirculation is deactivated
• The fuel injection rate is limited (torque limitation)

We can assume no liability for printing errors or inaccuracies in this document and reserve the right to introduce technical modifications at any time.