Component Inspection

Check IATS.

Ignition "OFF".
Disconnect IATS connector.

Measure resistance between terminals "1" and "3" of the IAT sensor connector.

Specification: (error range is 2~3%.)

IATS SPECIFICATIONS

Temperature (°C/°F)	0 (32°F)	20 (68°F)	40 (104°F)	80 (176°F)
Resistance (Ω)	5.3~6.7	2.3~3.0	1.0~1.5	0.3~0.42

Fig 1: Measuring Resistance Between Terminals 1 And 3 Of IAT Sensor Connector

G07347361

Is the measured resistance within specifications?
YES
- Go to " 2 Check ECM" as below.
NO
- Check IAT sensor for contamination, deterioration, or damage. Substitute with a known-good IAT sensor and check for proper operation.
  If the problem is corrected, replace IATS and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

Check ECM.
1. Ignition "OFF".
2. Connect Scantool and Ignition "ON" & Engine "OFF".
3. Select simulation function on scantool.
4. Simulate voltage at terminal "1" of IAT sensor signal connector.
  
  Fig 2: Simulating Voltage At Terminal 1 Of IAT Sensor Signal Connector
5. Does the signal value of IAT sensor changes according to simulation voltage?
  YES
  - Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Substitute with a known - good ECM and check for proper operation.
    If the problem is corrected, replace ECM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.