Exhaust Gas Pressure Sensors

The Exhaust Gas Pressure Sensor is a Differential Sensor measuring the pressure difference between gas in the intake and the outtake of the Particulate Filter. The outtake may be directly set to ambient pressure depending on the model.

This sensor is another element in the pollution regulation systems for Diesel engines imposed by European emissions regulation.

There are currently two different systems where the sensor is found:

Diesel Particulate Filter Systems with additive (FAP):

1. Dashboard Control Unit

2. Engine Control Unit

3. Mass Airflow sensor

4. Diesel Engine

5. Turbo compressor Temperature Sensor

6. Turbo compressor

7. Particulate Filter Temperature Sensor

8. Lambda Sensor

9. Particulate Filter

10. Exhaust Gas Pressure Sensor 1

11. Post-Particulate Filter Temperature Sensor

12. Muffler

Diesel Particulate Filter Systems with no additive (DPF):

1. Dashboard Control unit

2. Engine Control Unit

3. Additive Tank

4. Additive level Sensor

5. Additive Pump

6. Fuel Tank

7. Diesel engine

8. Turbo compressor Temperature Sensor

9. Turbo compressor

10. Lambda Sensor

11. Oxidation Catalytic Converter

12. Particulate Filter Temperature Sensor

13. Particulate Filter

14. Exhaust Gas Pressure Sensor 1

15. Muffler

16. Mass Airflow Sensor

Technical data:

All these figures are common for all FAE Exhaust Pressure Sensors. Every part has its specific working curve and tolerances

The Exhaust Gas Pressure Sensor is built with the following components:

1. Sensing element: electronic circuit over ceramics board
2. Body: molded with PBT+30GF, contains all the parts and has two air intakes.
3. Pins: tin soldered by automated operation
4. Lid: to grant air tightness

In the sensing element:

A- Electronic circuit
B- Ceramics substrate
C- Die protector
D- Silicon resin (to protect the electronics)
E- Bonding

The sensor body, the connector and the cable should be checked to ensure that they are in good condition. Also check if the sensor body has any cracks, dents or knocks that could have damaged it.

Visual inspection can help but it is not enough to determine if the sensor is operating well.

FAILURE CAUSES CAN BE:

• Breaks, pores or cracks in the pipes
• Wear signs in the connector or wirings
• Damage of the sensing element causing bad pressure readings
• Air leakage in the sensor
• Wear in the joints between the sensor and the pipes

MALFUNCTION OF SENSOR CAN CAUSE ANY OF THE FOLLOWING SYMPTOMS:

• Unnecessary filter regenerations
• Power losses if the sensor is not detecting the filter saturation level
• Dashboard light for Particulate filter (or preheating in some models) and blinking light for pre-heating
• Reduction of filter lifespan due to unnecessary regenerations
• Increase in oil consumption
• Increase in pollution levels

Follow these steps to install the FAE Exhaust Gas Pressure Sensor :

1. Power off the vehicle
2. Locate the sensor (following the pipes coming out of the particulate filter)
3. Disconnect pressure pipes (input and output)
4. Disconnect sensor connector
5. Extract fixation screws or whatever the holding mechanism is Install replacement sensor
6. Connect pipes and electrical connector