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

BME014013215W02

  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".

MAF PID

  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".

MAF PID

  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