Intake manifold sensors. 1.9 TDI PD from VAG Group. Family of diesel engines with injection pump-injector

Intake manifold sensors

Intake manifold sensors are integrated into a single module and installed in the intake manifold. There are the following intake manifold sensors:

• Absolute pressure sensor in collector G71;
• Intake air temperature sensor G72.

Absolute pressure sensor in collector G71

Signal application

The absolute pressure sensor in the manifold G71 gives the signal needed to check the boost pressure. The J248 Direct Fuel Injection Control Module compares the actual measured value with the set value on the charge pressure map. If the actual value deviates from the set value, the direct fuel injection engine control module J248 regulates the boost pressure using the bypass valve N75.

Consequences of signal failure

The charge pressure can no longer be adjusted. Engine performance decreases.

Intake air temperature sensor G72

Signal application

The J248 Direct Fuel Injection Diesel Control Module requires a signal generated by the intake air temperature sensor G72 as a correction value to calculate the boost pressure. He can then calculate the effect of temperature on the density of the inflated air.

Consequences of signal failure

If the G72 intake temperature sensor signal does not operate, the J248 Direct Fuel Injection Control Module uses a fixed value to calculate the boost pressure. This can reduce engine performance.

Read more about the family of diesel engines with injection pump-injector here .