air_system_E91

Air mass system test diesel 4-cylinder (D1362_D6LMS)

General car is working properly, but sometimes I has the feeling (in low gear, up to 2500 rmp) that has result not enough power.

Result: Maximum charge-air pressure was exeeded.
Probable cause: turbine control works incorrectly

Any suggestions ?


Test procedure The charge-air pressure sensor is checked for indication of plausible values. The intake air temperature sensor and charge-air temperature sensor are checked for signal plausibility The mass air flow meter is checked at output speed and idling by a comparison between measured and theoretically calculated air mass (exact description, see test module and function test instructions "Mass air flow meter"). At the same time, there is a check as to whether the system builds up the charge-air pressure quickly enough and to a high enough level. Function check of the exhaust recirculation control valve and the charge-air pressure actuator/turbocharger by means of the following automatic test procedure: Activation of the charge-air pressure actuator at minimum pulse duty factor Gradual opening of the exhaust-gas recirculation controller, measurement of the air-mass change Closure of the exhaust-gas recirculation controller Activation of the charge-air pressure actuator at maximum pulse duty factor Gradual opening of the exhaust-gas recirculation controller, measurement of the air-mass change The idling speed is automatically increased for this test. The measured changes in air mass flow are automatically analysed. They are compared with one another in such a way that conclusions can be drawn as to the function of the exhaust-gas recirculation controller, the charge-air pressure actuator and the turbocharger.

Category:

Autos & Vehicles

Tags:

• DIS
• BMW
• E91
• 320d
• Air
• mass
• system