MASS AIR FLOW (MAF) SENSOR INSPECTION[LF, L3]

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Note

•  Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart.

Visual Inspection

1.  Visually inspect the MAF sensor for the following:

•  Damage, cracks

•  Rusted sensor terminal

•  Bent sensor terminal

―  If there is any malfunction, replace the MAF sensor.

―  If the monitor item status/specification (reference) is not within the specification even though there is no malfunction, perform the “Circuit Open/Short Inspection”.

Voltage Inspection

1.  Remove the MAF/IAT sensor without disconnect the MAF/IAT sensor connector.

2.  Turn the ignition switch to the ON position.

3.  As the air gradually approaches the MAF detection part of the MAF/IAT sensor, verify that the voltage at PCM terminal 1AK^*1, 1AC^*2 (M-MDS PID: MAF) varies.

•  If it cannot be verified even though the related harnesses have no malfunction, replace the MAF/IAT sensor.

Circuit Open/Short Inspection

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1.  Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION[LF, 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 1AR^*1, 1AE^*2

―  MAF sensor terminal C and PCM terminal 1AK^*1, 1AC^*2

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