Denso-Common Rail System – MAF sensor

fig 1 28 Denso Common Rail System   MAF sensor

The MAF sensor works according to the hot film principle.

The sensor’s output signal is a digital square-wave signal with a variable frequency.

The following generally applies: the frequency drops with increasing engine speed.

The MAF sensor is used to control the exhaust gas recirculation (closed-loop control).

Effects of faults

In the event of a fault, the EGR system is switched off.

Diagnosis

The monitoring system checks:
• if the values output by the sensor are within the limits,
• the sensor for short circuit to battery/ground,
• for intermittent faults.

Emissions-related component:
• Yes (MIL-active).

03. September 2018 by sam
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