Component Inspection

Check IATS

IG "OFF" and disconnect IATS connector.

Measure resistance between terminals 4 and 5 of IATS connector. (Component side)

SPECIFICATION :

TEMPERATURE AND RESISTANCE SPECIFICATION

Temp. (°C/°F)	Resistance (kΩ)	Temp. (°C/°F)	Resistance (kΩ)
-40 (-40)	95.95 ~ 105.78	20 (68)	3.42 ~ 3.61
-20 (-4)	27.4 ~ 29.77	40 (104)	1.43 ~ 1.5
0 (32)	9.08 ~ 9.72	60 (140)	0.66 ~ 0.69
10 (50)	5.49 ~ 5.83	80 (176)	0.33 ~ 0.34

Is the measured resistance within specification ?

YES

Go to 2 "Check PCM" as follows.

NO

Substitute with a known-good IATS and check for proper operation. If the problem is corrected, replace IATS and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

Check PCM
1. IG "OFF" and connect scantool.
2. Disconnect IATS connector and connect probe to terminal 4 of IATS harness connector.
3. IG "ON" and ENG "OFF" and simulation Function on scantool.
4. Simulate voltage at terminal 4 of IATS harness connector.
  
  Fig 1: Diagnosis Function Screen Display - Intake Air Temp
  Courtesy of HYUNDAI MOTOR CO.
5. Does the signal value of IAT sensor change 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 PCM and check for proper operation. If the problem is corrected, replace PCM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NOTE: There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM.

NOTE: Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others.