B Series Truck 4WD L4-2606cc 2.6L SOHC (1992)
Mass Air Flow Sensor: Testing and Inspection
Air Flow Meter/Sensor
Testing Air Flow Meter
1. Remove rubber boot from air flow sensor connector.
2. Check terminal voltages as follows:
TERMINAL
B/Y (Power supply)
G/O (Burn-off)
G/B (Air flow mass)
G/Y (Ground)
B/O (Ground)
IGNITION ON
B/Y - Approx. 12V
G/O - 0V
G/B - 1.0 - 2.0V
G/Y - Approx. 0V
B/O - Approx. 0V
ENGINE RUNNING
B/Y - Approx. 12V
G/O - 0V
G/B - 1.9 - 5.0V
G/Y - Approx. 0V
B/O - Approx. 0V
3. If not as specified, check wiring harness for an open or short circuit. If harness is okay, check burn-off operation. Refer to OUTPUT DEVICES,
BURN-OFF CONTROL SYSTEM.
4.
If burn-off operation is as specified, replace airflow sensor.