9000 L4-1985cc 2.0L DOHC Turbo EFI (1987)
Air Flow Meter/Sensor: Testing and Inspection
Mass Air Flow Sensor
Checking the Mass Air Flow Sensor
In connection with diagnosing faults on and/or carrying out repairs to the LH 2.2 and LH 2.4 fuel injection systems on mode; year 1988 and later cars,
it is important to observe the following:
Mass air flow sensor of plastic
This mass air flow sensor must never be replaced by a mass air flow sensor of aluminium. If this is done, the LH control module will be ruined.
LH control module in fuel injection systems with a mass air flow sensor of plastic
This LH control module must never be replaced by an LH control module designed for fuel injection systems with a mass air flow sensor of
aluminium.
Mass air flow sensors of plastic are fitted to the following versions of model year 1988 cars:
9000i/S with catalytic converter (LH 2.4)
9000i without catalytic converter (LH 2.2)
All versions of model year 1989 and later cars are fitted with mass air flow sensors of plastic.
Tools:
- Multimeter
- Breakout Box 86 11 006
- Test cables 86 11 410
The CHECK ENGINE lamp (MIL) comes on in the event of a fault in the mass air flow sensor.
1 Unplug the mass air flow sensor connector. Connect a multimeter to the mass air flow sensor pins as follows:
LH 2.2 -M1987
pins 3 and 6
LH 2.2 M1988-1990 + LH 2.4.2 without cat
pins 2 and 6
Adjust to 380 ohms. If it cannot be adjusted to the correct value, change the mass air flow sensor.
2 Check that the pins in the connector and mass air flow sensor are free from corrosion. Check that the wire mesh screens in the ends of the mass air
flow sensor are intact and clean.