Air Flow Sensor HH-MAF1001

HEHUA NO: HH-MAF1001

OEM NO:
0280217121
0986280202
0280217122
1384275
06A906461
95VW12B529BB
95VW12B529BC
1051396
1428448

APPLICATION:
AUDIA4 Avant (8E5, B6) (2001/04 – 2004/12)
A4 Avant (8E5, B6) 1.9 TDI AVB 1896 74 101 Estate 01/11 – 04/12
FORDGALAXY (WGR) (1995/03 – 2006/05)
GALAXY (WGR) 1.9 TDI AUY 1896 85 115 MPV 00/04 – 06/05
GALAXY (WGR) 1.9 TDI AVG 1896 81 110 MPV 97/08 – 00/04
SEATALHAMBRA (7V8, 7V9) (1996/04 – 2010/03)
ALHAMBRA (7V8, 7V9) 1.9 TDI ANU 1896 66 90 MPV 96/04 – 10/03
ALHAMBRA (7V8, 7V9) 1.9 TDI AVG 1896 81 110 MPV 96/08 – 00/06
SKODAOCTAVIA (1U2) (1996/09 – 2010/12)
OCTAVIA (1U2) 1.9 TDI ALH 1896 66 90 Hatchback 96/09 – 10/03
OCTAVIA (1U2) 1.9 TDI ASV 1896 81 110 Hatchback 97/08 – 06/01
SKODAOCTAVIA Combi (1U5) (1998/07 – 2010/12)
OCTAVIA Combi (1U5) 1.9 TDI ALH 1896 66 90 Estate 98/07 – 10/03
OCTAVIA Combi (1U5) 1.9 TDI ASV 1896 81 110 Estate 98/07 – 06/01
OCTAVIA Combi (1U5) 1.9 TDI 4×4 AGR 1896 66 90 Estate 99/11 – 06/02
OCTAVIA Combi (1U5) 1.9 TDI AXR 1896 74 100 Estate 00/08 – 10/12
SKODAFABIA Combi (6Y5) (2000/04 – 2007/12)
FABIA Combi (6Y5) 1.9 TDI AXR 1896 74 100 Estate 00/04 – 07/12
VWSHARAN (7M8, 7M9, 7M6) (1995/05 – 2010/03)
SHARAN (7M8, 7M9, 7M6) 1.9 TDI ANU 1896 66 90 MPV 95/09 – 10/03
SHARAN (7M8, 7M9, 7M6) 1.9 TDI BVK 1896 85 115 MPV 00/04 – 10/03
SHARAN (7M8, 7M9, 7M6) 1.9 TDI AVG 1896 81 110 MPV 96/09 – 00/04
VWGOLF IV (1J1) (1997/08 – 2005/06)
GOLF IV (1J1) 1.9 TDI ALH 1896 66 90 Hatchback 97/10 – 04/05
GOLF IV (1J1) 1.9 TDI ASV 1896 81 110 Hatchback 97/08 – 04/05
GOLF IV (1J1) 1.9 TDI AUY 1896 85 115 Hatchback 98/12 – 01/06
VWGOLF IV Variant (1J5) (1999/05 – 2006/06)
GOLF IV Variant (1J5) 1.9 TDI ALH 1896 66 90 Estate 99/05 – 06/05
GOLF IV Variant (1J5) 1.9 TDI ASV 1896 81 110 Estate 99/05 – 01/06
GOLF IV Variant (1J5) 1.9 TDI AUY 1896 85 115 Estate 99/08 – 01/06
VWNEW BEETLE (9C1, 1C1) (1998/01 – 2010/09)
NEW BEETLE (9C1, 1C1) 1.9 TDI ALH 1896 66 90 Hatchback 98/01 – 04/06
VWBORA (1J2) (1998/10 – 2005/09)
BORA (1J2) 1.9 TDI ALH 1896 66 90 Saloon 98/10 – 05/05
BORA (1J2) 1.9 TDI ASV 1896 81 110 Saloon 98/10 – 01/06
BORA (1J2) 1.9 TDI 4motion AGR 1896 66 90 Saloon 98/11 – 02/04
BORA (1J2) 1.9 TDI AUY 1896 85 115 Saloon 98/12 – 02/01
BORA (1J2) 1.9 TDI AXR 1896 74 101 Saloon 00/09 – 05/05
BORA (1J2) 1.9 TDI 4motion AUY 1896 85 115 Saloon 99/02 – 01/06
VWBORA Estate (1J6) (1999/05 – 2005/05)
BORA Estate (1J6) 1.9 TDI AXR 1896 74 101 Estate 00/09 – 05/05
BORA Estate (1J6) 1.9 TDI 4motion AUY 1896 85 115 Estate 99/05 – 01/06
BORA Estate (1J6) 1.9 TDI ALH 1896 66 90 Estate 04/07 – 05/05
BORA Estate (1J6) 1.9 TDI ASV 1896 81 110 Estate 99/05 – 01/06
BORA Estate (1J6) 1.9 TDI AUY 1896 85 115 Estate 99/05 – 01/06
VWPOLO (9N_) (2001/10 – 2012/01)
POLO (9N_) 1.9 TDI BMT 1896 74 101 Hatchback 01/10 – 09/11

The sensor used to determine mass flow rate of the air is known as mass airflow sensor. The air mass details are required in order to balance correct amount of fuel mass to the vehicle engine.

As air density depends on temperature, altitude as well as application of forced induction, MAF sensors are more useful and more appropriate to determine quantity of air intake in each of the cylinder compare to volumetric flow sensors.

The Mass Airflow Sensor (MAF sensor) converts amount of air available in the engine into voltage signal. Air volume information is essential to calculate load in the ECM (Engine Control Module). The information will help for the following.
• How much fuel to inject
• When to iginite cylinder
• When to shift transmission
Following are the types of Mass Airflow sensors:
• Vane Airflow Meter
• Karmen Vortex
• Hot Wire MAF Sensor

The Hot Wire type of MAF sensor is most common and most popular. It consists of thermistor, platinum hot wire and electronic control circuit. The same has been depicted in the figure-2.

Let us understand working of hot wire mass airflow sensor.
• Thermistor measures incoming air temperature.
• Hot wire is kept at constant temperature with respect to thermistor using electronic control circuit.
• When air flow increases, hot wire loses heat and control circuit compensates this by increasing more current through the wire.
• At the same time Control circuit measures current flow and proportionately puts out voltage signal.

Following are the advantages of Hot Wire MAF Sensor:
• It responds faster to changes in air flow rate.
• It is less sensitive to location as well as orientation.
• It is durable as there are no moving parts.
• It is less expensive.
• Avoids use of separate pressure sensor and temperature sensor to determine air mass.
• Smaller size.

Following are the disadvantages of Hot Wire MAF Sensor:
• Oil and dirt contaminates hot wire and hence deteriorates accuracy of sensor.
• Thin platinum wire can get damage if not handled properly.

Mass Air flow sensor control air/fuel ratio accurately in the engine.