Test Point 6 - Air Flow Sensor
TEST POINT 6 - DME 944Air Flow Sensor
A) Power Supply (V)
Pull back plug seal of air flow sensor (plug remains connected). Connect voltmeter on terminals 3 and ground through back of plug.
Turn on ignition.
Display: 5 ± 0.5 volts
B) Voltage Drop on Sensor Plate Potentiometer (V)
Remove air cleaner. Connect voltmeter on term. 2 and ground.
Display: approx. 250 - 260 mV
Press sensor plate to full load position. Sensor plate must move easily, without hesitation.
Display: sensor plate in full load ~ 4.60 volts
Turn off ignition. Pull off plug and install plug seal.
C) NTC I (Intake Air Temperature)
Air flow sensor plug pulled off.
Connect ohmmeter on terminals 1 and 4 of air flow sensor (terminals 6 and 22 on control unit, air flow sensor plug connected!).
Display: 0°C = 4.4 - 6.8 kohm
15 - 30°C = 1.4 - 3.6 kohm
40°C = 1.0 - 1.3 kohm
Note: Temp. sensor with break: richer mixture
Temp. sensor with short circuit: leaner mixture