Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2013128I 2D CONVERTIBLE, ENG CD N52, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2804 (FUNCTIONAL DESCRIPTION - F10 - ENGINE PERFORMANCE)ENGINE PERFORMANCE - FUNCTIONAL DESCRIPTIONAIR MASS SYSTEM TEST FOR DIESEL ENGINESTEST SEQUENCE
2013 BMW 128i 2D Convertible, Eng CD N52, Standard Trans
Test sequence
2013 BMW 128i 2D Convertible, Eng CD N52, Standard TransSECTION Test sequence
WARNING: This page does not describe the selected car, but rather 45 other vehicles, including the 2016 BMW M5, 2016 BMW 550i xDrive, 2016 BMW 550i, 2016 BMW 535i xDrive, and 2016 BMW 535i. However, it is still accessible from the selected car via links, so may be relevant.
- The charging 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 hot film air mass meter is tested at cutoff speed and at idle speed by comparison of the measured and theoretically calculated air mass.
At the same time, there is a check as to whether the system builds up the charging pressure quickly enough and to a high enough level.
- Functional check of the exhaust-gas recirculation actuator and the charging pressure actuator/turbocharger by means of the following automatic test procedure:
- Activation of the charging pressure actuator at minimum pulse duty factor (TV)
- Gradual opening of the exhaust-gas recirculation actuator, measurement of the air-mass change
- Closure of the exhaust-gas recirculation actuator
- Activation of the charging pressure actuator at maximum duty cycle
- Gradual opening of the exhaust-gas recirculation actuator, measurement of the air-mass change
The idling speed is automatically increased for this test.
- The measured changes in air mass flow are automatically analyzed. They are compared with one another in such a way that conclusions can be drawn as to the function of the exhaust-gas recirculation actuator, the charging pressure actuator and the turbocharger.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.