MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [MZR-CD (RF Turbo)]

Note

• Perform the following test only when directed.

• Perform "MAF Correction" after replacing the MAF/IAT sensor. (See MAF Correction.)

MAF Sensor Voltage Inspection

1. Turn the engine switch to ON.

2. Monitor the MAF PID using the WDS or equivalent.

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

0.0-1.0 V

3. Start the engine and warm up the engine completely.

4. Monitor the MAF PID using the WDS or equivalent at idle.

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

1.5-2.1 V

MAF Sensor Circuit Open/Short Inspection

1. Inspect for open/short circuit in the following wiring harnesses.

• If there is open/short circuit, repair or replace wiring harnesses.

Open circuit

• Power circuit

- MAF/IAT sensor terminal A and PCM control relay terminal C

• Signal circuit

- MAF/IAT sensor terminal C and PCM terminal 9

• GND circuit

- MAF/IAT sensor terminal B and PCM terminal 14

Short circuit

• Power circuit

- MAF/IAT sensor terminal A and PCM control relay terminal C to GND

• Signal circuit

- MAF/IAT sensor terminal C and PCM terminal 9 to power circuit

- MAF/IAT sensor terminal C and PCM terminal 9 to GND

IAT Sensor No.1 Resistance Inspection

1. Disconnect the MAF/IAT sensor connector.

2. Measure the resistance between MAF/IAT sensor terminals D and E using an ohmmeter.

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

Specification

Ambient temperature (°C {°F})	Resistance (kilohm)
20 {68}	2.21-2.69

IAT Sensor No.1 Circuit Open/Short Inspection

1. Inspect for open/short circuit in the following wiring harnesses.

• If there is open/short circuit, repair or replace wiring harnesses.

Open circuit

• Signal circuit

- MAF/IAT sensor terminal D and PCM terminal 60

• GND circuit

- MAF/IAT sensor terminal E and PCM terminal 91

Short circuit

• Signal circuit

- MAF/IAT sensor terminal D and PCM terminal 60 to power circuit

- MAF/IAT sensor terminal D and PCM terminal 60 to GND