Air Flow Meter/Sensor: Testing and Inspection

MASS AIR FLOW SENSOR
^ If the mass air flow sensor or circuit has an open or short, Diagnostic Trouble Code No. PO102, P0103, P11OO or P11O1 is output.
^ A malfunction in the mass air flow sensor circuit may cause lack of power, poor acceleration, hesitate at drive-away or vehicle shake on deceleration.
^ If battery power circuit shorts to ground, engine may stall and may not restart. This will melt EEC PWR fuse.







INSPECTION

CAUTION:
^ Do not drop or subject the sensor to sharp shock.
^ Do not put or allow anything in the sensor.
1. Disconnect the mass air flow sensor connector.
2. Remove the mass air flow sensor.
3. Check for damage of the sensor.
4. Reconnect the mass air flow sensor.
5. Connect the Special Service Tool SST New Generation Star (NGS) tester to the data link connector.
6. Turn the ignition switch ON or run the engine. Select the PID/DATA monitor and Record function on the NGS.

ENGINE CONDITION PID/VOLTAGE DATA
Key ON/Engine OFF 0.0 V
Hot Idle 0.8 V
Driving 48 km/h (30 mph) 0.6-2.0 V
Driving 88 km/h (55 mph) 1.5-2.5 V

7. If not as specified, replace the mass air flow sensor.

Tightening torque 10 Nm (89 in. lbs.)


VOLTAGE TO MASS AIR FLOW CONVERSION TABLE

VOLTAGE SIGNAL AIR FLOW
0.34 V 1.46 gm/sec
0.39 V 1.68 gm/sec
0.60 V 2.52 gm/sec
1.00 V 7.64 gm/sec
1.96 V 27.09 gm/sec
3.90 V 151.79 gm/sec