#
MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513)

BME014013215203

  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".

Specification

  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".

Specification

  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 (harness-side) and main relay terminal C (harness-side)
  - MAF/IAT sensor terminal E (harness-side) and PCM terminal 88
  - MAF/IAT sensor terminal D (harness-side) and PCM terminal 36

### Short circuit

  • If there is continuity, the circuit is shorted. Repair or replace the harness.
  - MAF/IAT sensor terminal B (harness-side) and body ground
  - MAF/IAT sensor terminal E (harness-side) and power supply
  - MAF/IAT sensor terminal E (harness-side) and body ground
  - MAF/IAT sensor terminal D (harness-side) and power supply
  - MAF/IAT sensor terminal D (harness-side) 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 (harness-side) and PCM terminal 91
  - MAF/IAT sensor terminal F (harness-side) and PCM terminal 39

### Short circuit

  • If there is continuity, the circuit is shorted. Repair or replace the harness.
  - MAF/IAT sensor terminal A (harness-side) and power supply
  - MAF/IAT sensor terminal F (harness-side) and power supply
  - MAF/IAT sensor terminal F (harness-side) and body ground