MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed))

Note

• Perform the following test only when directed.

MAF Sensor Voltage Inspection

1. Turn the ignition switch to LOCK.

2. Connect the WDS or equivalent to the DLC-2.

3. Turn the ignition switch to ON position (Engine OFF).

4. Select MAF PID on the WDS or equivalent.

5. Verify that MAF PID is within the specification.

• If not as specified, perform the "MAF Sensor Circuit Open/Short Inspection".

0.0-0.1 V

6. Turn the ignition switch to START and warm up the engine completely.

7. Verify that MAF PID is within the specification.

• If not as specified, perform the "MAF Sensor Circuit Open/Short Inspection".

0.5-0.8 V

MAF Sensor Circuit Open/Short Inspection

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

2. Inspect the following wiring harness for open or short (Continuity check).

Open circuit

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

- MAF/IAT sensor terminal B and main relay terminal D

- MAF/IAT sensor terminal E and PCM terminal 11

- MAF/IAT sensor terminal D and PCM terminal 10

Short circuit

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

- MAF/IAT sensor terminal B and body ground

- MAF/IAT sensor terminal E and power supply

- MAF/IAT sensor terminal E and body ground

- MAF/IAT sensor terminal D and power supply

- MAF/IAT sensor terminal D and body ground

MAF Rate and Load Value

Note

• The scan tool shows the MAF rate and load value.

Specification

item	Intake MAF (g/s)	Engine load calculated value (%)
Idle*1	3.3-4.7	18-20
Engine speed 2,500 rpm*2	12.1-15.0	17-19

*¹ :

700-800 rpm

*² :

No load, N position or P position

IAT Sensor Resistance Inspection

1. Disconnect the MAF/IAT sensor connector.

2. Measure the resistance between MAF/IAT sensor terminals A and F using an ohmmeter.

• If not as specified, replace the MAF/IAT sensor.

• If the IAT sensor is normal, but the IAT PID is out of specification, perform the "IAT Sensor Circuit Open/Short Inspection".

Specification

Ambient temperature (°C {°F})	Resistance (kilohms)
10 {50}	3.3-4.1
20 {68}	2.2-2.7
30 {86}	1.4-1.9

IAT Sensor Circuit Open/Short Inspection

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

2. Inspect the following wiring harness for open or short (Continuity check).

Open circuit

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

- MAF/IAT sensor terminal A and PCM terminal 20

- MAF/IAT sensor terminal F and PCM terminal 15

Short circuit

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

- MAF/IAT sensor terminal A and power supply

- MAF/IAT sensor terminal F and power supply

- MAF/IAT sensor terminal F and body ground