Introduction
Vehicles: CITROEN, FORD, PEUGEOT
Product: Air mass sensor
Models with 1.6 l diesel engine:
CITROEN Berlingo, C2, C3, C4, C5, Jumpy, Xsara Picasso (HDi)
FORD Fiesta, Focus, Fusion (TDCi)
PEUGEOT Expert, Partner, 1007, 206, 207, 307, 308, 407 (HDi)
Pierburg No.: 7.28342.06.0
Replacement for: 7.28342.04.0
O.E. No.*: 9650010780; 1232096; 1255117; 3M5A12B579BA; 3M5A12B579BB; Y60113215; 1920GV; 30774680
* The refence numbers given are for comparison purposes only and must not be used on invoices to the consumer.
Potential complaints:
- Black smoke
- Lack of power
- Limp home function
- Fault code P0100, P0101, P0102, P0103, P0104
These complaints can indicate a defective air mass sensor.
With this air mass sensor, the measured air mass fl ow rate is output as a frequency modulated rectangular signal. Therefore, an oscilloscope or a multimeter with frequency measuring range is required for testing.
An integrated temperature sensor records the intake air temperature. It can be measured as an electrical resistance with a standard Ohm meter or multimeter.
- Temperature resistance
- Earth
- (Not assigned)
- Supply voltage (12 V)
- Frequency output
Testing the supply voltage
Equipment:
Oscilloscope or corresponding function on an engine tester or multimeter
- Disconnect the plug from the air mass sensor.
- Connect multimeter or oscilloscope to pin 4 and pin 2 of the connecting cable ("Volt" measuring range).
- Turn on the ignition.
Setpoint value: On-board voltage (> 11 V)
Testing the temperature sensor
Equipment:
Multimeter or engine tester, thermometer, suitable equipment for generating heat, e.g. hot air gun.
- Use a motor tester to test the actual intake air temperature values stored in the engine control unit.
Setpoint value: Ambient air temperature
Alternatively:
- Disconnect the plug from the air mass sensor.
- Connect the multimeter to pin 1 and earth (2) on the air mass sensor (“Resistance” measuring range).
- Use a hot air gun and the thermometer to set various testing points.
Examples:
0 °C - 5846 Ω / 25 °C - 2000 Ω / 40 °C - 1128 Ω / 60 °C - 564 Ω / 120 °C - 103 Ω
Testing the air mass flow rate
Equipment:
Oscilloscope or corresponding function on an engine tester
- Air mass sensor can remain installed. Plug must remain connected.
As no method available in the workshop for determining the actual air mass passing through as a reference, the measured value with the engine stopped, i.e. air mass = 0, is used as a reference variable.
- Turn on the ignition. Do not start the engine.
- Measure the frequency between pin 2 and pin 5.
Setpoint value: 5000 ±10 Hz - The signal voltage from the sensor must be around 12 V. In the oscilloscope image, this is the highest value of the rectangular signal.
- Start the engine.
- Press the gas pedal.
- The frequency must now fall, i.e. the curve in the oscilloscope is extended further.
On some engine testers that have an integrated oscilloscope, it is possible to display a reference signal. The reference signal shows the voltage curve when idle. The two curves must be approximately congruent when idle.