5 L4-2.3L (2007)
Air Flow Meter/Sensor: Testing and Inspection
MASS AIR FLOW (MAF) SENSOR INSPECTION[L3]
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:
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Damage, cracks
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Rusted sensor terminal
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Bent sensor terminal
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If there is any malfunction, replace the MAF sensor.
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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.
Circuit Open/short Inspection
3. As the air gradually approaches the MAF detection part of the MAF/IAT sensor, verify that the voltage at PCM terminal 1AC (M-MDS PID:
MAF) varies.
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If it cannot be verified even though the related harnesses have no malfunction, replace the MAF/IAT sensor.
1. Disconnect the PCM connector.
2. Disconnect the MAF sensor connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
Open circuit
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If there is no continuity, there is an open circuit. Repair or replace the wiring harness
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MAF sensor terminal A and main relay terminal C
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MAF sensor terminal B and PCM terminal 1 BD
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MAF sensor terminal C and PCM terminal 1 AC
Short circuit
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If there is continuity, there is a short circuit. Repair or replace the wiring harness.
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MAF sensor terminal A and body ground
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MAF sensor terminal C and power supply
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MAF sensor terminal C and body ground
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MAF sensor terminal B and power supply