9000 L4-1985cc 2.0L DOHC (1986)
Air Flow Meter/Sensor: Testing and Inspection
Checking the Operation of Filament (Hot Wire) Burn-Off
Checking the Operation of Filament (Hot Wire) Burn-Off
Tools
- Multimeter
- Test cables 8611 352
1 Remove the mass air flow sensor from the air cleaner. Check that the filament (hot wire) is OK.
2 Start the engine and warm it up to at least 65°C (150°F). Run it at idling speed. Rev up the engine to 2,500 rpm, release the accelerator and let the
engine run at idling speed again.
3 Switch off the ignition and observe the filament. After about 20 seconds (4 seconds for LH 2.2) it should glow brightly for about one second.
4 If burn-off is not obtained, unplug the mass air flow sensor connector. Connect the multimeter's test prods to pins 1 and 4 of the connector. Start
the engine and warm it up as in point 2. Switch off the engine and observe the multimeter. After about 20 seconds (4 seconds for LH 2.2) it should
give a reading of about 4 V for about 1 second.
Important
In the event of filament breakage, the control module automatically goes into "Limp Home" mode.
The CHECK ENGINE lamp (MIL) lights up.
5 If all is correct, change the mass air flow sensor. If it is not, check the mass air flow sensor's wiring and connections.
6 If the wiring is OK, try fitting another control module.
7 Start the engine and check as described above. If a voltage reading is now obtained but burn-off does not occur, change the mass air flow sensor.
