MASS AIR FLOW (MAF) SENSOR INSPECTION [L3 Turbo]

Visual Inspection

Note

• Perform the following inspection only when directed.

1. Visually inspect for the following on the MAF sensor. (See INTAKE AIR SYSTEM REMOVAL/INSTALLATION [L3 Turbo].)

• Damage

• Cracks

• Bent terminals

• 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

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

2. Disconnect the MAF sensor connector.

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

Open circuit

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

- MAF sensor terminal A and main relay terminal C

- MAF sensor terminal B and PCM terminal 1I

- MAF sensor terminal C and PCM terminal 1P

Short circuit

• If there is continuity, there is a short circuit. Repair or replace the wiring 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

Specification

Condition	Intake MAF (g/s)	Engine load calculated value (%)
Idle*1	2.72-2.94	17.1-18.5
Engine Speed 2,500 rpm*2	8.00-8.66	14.2-15.2

^*1 :

650-750 rpm

^*2 :

No load or neutral position