Vanden Plas L6-4.0L (1990)
Mass Air Flow Sensor: Testing and Inspection
Airflow Meter Connector
PREPARATION
1.
Unplug air mass meter electrical connector. Connect pin 36 to the negative side of a suitable power supply and pin 9 to the positive side.
2.
Set power supply to 14V.
3.
Connect voltmeter positive lead to pin 7 and negative lead to pin 6. Select a voltage range as close to 0 - 10V as your meter permits.
TEST 1
NOTE: Make this test with no air moving through air mass meter. Ideally, each end of the meter should be covered.
1.
If voltmeter reading is 0.4V ± 0.2V, air mass meter is okay.
2.
If voltmeter reading is 0V, an open circuit exists. Air mass meter should be replaced.
3.
If voltmeter reading is greater than 0.7V, air mass meter calibration is incorrect, the module is defective or hot or cold sensor has become detached
from its connections. Air mass meter should be replaced.
TEST 2
NOTE: For this test, read voltages that result from blowing one hard blast of air through air mass meter in normal direction of flow.
1.
If voltmeter reading rises to 1.5V, then falls back to 0.4V ± 0.2V (same result as TEST 1, step 1), air mass meter is okay.
2.
If voltmeter reading is 0V, an open circuit exists. Air mass meter should be replaced.
3.
If voltmeter reading is greater than 0.7V, air mass meter calibration is incorrect, the module is defective or hot or cold sensor has become detached
from its connections. Air mass meter should be replaced.
4.
If voltmeter reading exceeds 5V, air mass meter calibration is incorrect or the module is defective. Air mass meter should be replaced.
