Air Flow Meter/Sensor: Testing and Inspection

NOTE: Perform the following test only when directed.

MAF Sensor Inspection

1. Visually inspect for damage, cracks, terminal bends and terminal rust on the MAF sensor.

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

- If the MAF sensor PID value or PCM terminal 88 voltage are out of specification, inspect as follows.
1. Disconnect the PCM connector.




2. Connect the SST (104 Pin Breakout Box) to the PCM as shown.
3. Tighten the connector attaching screw.

Tightening torque
7.9 - 10.7 Nm (80 - 110 kg.cm, 69.5 - 95.4 in.lb)

4. Inspect for an open or short circuit in the following wiring harnesses by probing the applicable sensor and SST (104 Pin Breakout Box) terminals with ohmmeter leads.
- If there is an open or short circuit, repair or replace wiring harnesses.
- If there is no open or short circuit, replace the MAF sensor.




Open circuit
- MAF signal circuit (MAF sensor connector terminal C and PCM connector terminal 88)
- Power circuit (MAF sensor connector terminal A and main relay terminal D through common connector)
- Ground circuit (MAF sensor connector terminal B and PCM connector terminal 77 through common connector)

Short circuit
- MAF signal circuit (MAF sensor connector terminal C and PCM connector terminal 88 to Ground)
- Power circuit (MAF sensor connector terminal A and main relay terminal D through common connector to Ground)

2. Reconnect the MAF sensor connector.

NOTE: The scan tool shows the MAF rate and load value.




Specification