#
INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION

BHE014018840W03

  Note

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

## Resistance Inspection

1. Disconnect the MAF/IAT sensor connector.

2. Verify that the resistance between MAF sensor terminals D and E is as indicated in the table while blowing hot air gradually into the IAT sensor part built into the MAF sensor.

  • If the monitor item condition/specification (reference) is not within the specification, even though the resistance is within the specification, perform the "Circuit Open/Short Inspection".
  • If not within the specification, replace the MAF/IAT sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION.)

  IAT sensor resistance

  Air temperature (°C {°F}) | Resistance (kilohm)
  --- | ---
  -20 {-4} | 13.6-18.4
  20 {68} | 2.21-2.69
  60 {140} | 0.493-0.667

IAT sensor characteristics graph (reference)

## Circuit Open/Short Inspection

1. Disconnect the PCM connectors.

2. Disconnect the MAF/IAT sensor connector.

3. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)

### Open circuit

  • If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness.
  – MAF/IAT sensor terminal D and PCM terminal 5K
  – MAF/IAT sensor terminal E and PCM terminal 4U

### Short circuit

  • If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness.
  – MAF/IAT sensor terminal D and body ground
  – MAF/IAT sensor terminal D and power supply