Mass Air Flow Sensor, Checking: Notes
Use only gold-plated terminals when servicing terminals in harness connector of Mass Air Flow (MAF) Sensor -G70-.
Special tools and workshop equipment required
- Multimeter.
- Wiring diagram.
Test requirements
- The Mass Air Flow (MAF) Sensor -G70- fuse OK. Battery voltage at least 12.5 volts.
- All electrical consumers such as, lights and rear window defroster, switched off.
- Vehicles with automatic transmission, shift selector lever into position "P" or "N".
- A/C switched off.
- Ground (GND) connections between engine/transmission/chassis OK.
- Coolant Temperature at least 80° C.
- Ignition switched off.
Test procedure
-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .
Start diagnosis
Function test
-- Connect the scan tool.
-- Start engine and let it run at idle.
-- Using the scan tool, Check the air flow quantity of the Mass Air Flow (MAF) Sensor -G70- at idle:
| Diagnostic text | Specified value | |||
|---|---|---|---|---|
| Air flow quantity at Mass Air Flow (MAF) sensor | ||||
|
2.00 to 5.00 g/sec | |||
-- End diagnosis and switch ignition off.
If the specified value was obtained, but the DTC memory has a DTC concerning the Mass Air Flow (MAF) Sensor -G70- :
-- Check the voltage supply of the Mass Air Flow (MAF) Sensor -G70- MASS AIR FLOW SENSOR, CHECKING .
If specified value was not obtained:
-- Check the wiring of the Mass Air Flow (MAF) Sensor -G70- MASS AIR FLOW SENSOR, CHECKING .