MASS AIR FLOW (MAF) SENSOR INSPECTION [ZJ, Z6]

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MASS AIR FLOW (MAF) SENSOR INSPECTION [ZJ, Z6]

B3E014013215W03

  Note

  • Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart. (See Troubleshooting Procedure.)

## Visual inspection

1. Visually inspect the MAF sensor for the following:

  • Damage, cracks
  • Rusted sensor terminal
  • Bent sensor terminal

  - If there is any malfunction, replace the MAF/IAT sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [ZJ, Z6].)

## Voltage Inspection

1. Remove the MAF/IAT sensor without disconnecting the MAF/IAT sensor connector.

2. Turn the ignition switch to the ON position.

3. As the air gradually approaches the MAF detection part of the MAF/IAT sensor, verify that the MAF sensor output voltage (WDS PID: MAF) varies.

  • If it cannot be verified even though the related wiring harnesses have no malfunction, replace the MAF/IAT sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [ZJ, Z6].)

## Circuit Open/Short Inspection

1. Remove the PCM connector cover.

2. Disconnect the PCM connector. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [ZJ, Z6].)

3. Inspect the following wiring harness for 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/IAT sensor terminal A and PCM terminal 2BG
  - MAF/IAT sensor terminal B and PCM terminal 2BC
  - MAF/IAT sensor terminal C and PCM terminal 2AU

### Short circuit

  • If there is continuity, there is a short circuit. Repair or replace the wiring harness.
  - MAF/IAT sensor terminal A and power supply
  - MAF/IAT sensor terminal A and body GND
  - MAF/IAT sensor terminal B and power supply
  - MAF/IAT sensor terminal C and power supply
  - MAF/IAT sensor terminal C and body GND