Mass Air Flow Sensor (Maf Sensor) - Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual

6E1-40 ENGINE AND EMISSION CONTROL SYSTEM (G16/J20 ENGINES)

Mass air flow sensor (MAF sensor)

INSPECTION
NOTE:
Use voltmeter with high-impedance (10 k
or digital type voltmeter.
1) Connect voltmeter to "B +" terminal of MAF sensor coupler
disconnected and ground.
2) Turn ignition switch ON and check that voltage is battery volt-
age.
If not, check if wire harness is open or connection is poor.
3) Turn ignition switch OFF and remove ECM/PCM cover from
bracket.
4) Connect MAF sensor coupler to MAF sensor.
5) Turn ignition switch ON and check voltage at MAF sensor
output terminal.
MAF sensor output voltage
1.0 – 1.6 V
6) Start engine and check that voltage is lower than 5 V and it
rises as engine speed increases.
(Reference data : 1.7 – 2.0 V at specified idle speed)
If check result is not as specified above, cause may lie in
wire harness, coupler connection, MAF sensor or ECM/
PCM.
Ω
/V minimum)