MASS AIR FLOW (MAF) SENSOR INSPECTION[L3]

id0140a7800700

Voltage Inspection

Note

•  Perform the following inspection only when directed.

1.  Visually inspect for the following on the MAF sensor.

•  Damage

•  Cracks

•  Terminal bends

•  Terminal rust

―  If any of the above are found, replace the MAF sensor.

―  If the MAF PID value is out of specification, carry out the “Circuit Open/Short Inspection”.

Circuit Open/Short Inspection

atraaw00001320

atraaw00000831

atraaw00001321

1.  Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION[L3].)

2.  Disconnect the MAF sensor connector.

3.  Inspect the following wiring harnesses for open or short. (Continuity check)

Open circuit

•  If there is no continuity, the circuit is open. Repair or replace the harness.

―  MAF sensor terminal A and main relay terminal A

―  MAF sensor terminal B and PCM terminal 1BC

―  MAF sensor terminal C and PCM terminal 1AC

Short circuit

•  If there is continuity, the circuit is shorted. Repair or replace the harness.

―  MAF sensor terminal A and body ground

―  MAF sensor terminal C and power supply

―  MAF sensor terminal C and body ground

―  MAF sensor terminal B and power supply