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P0098 Intake Air Temperature Sensor 2 Circuit High Input

AutoHex Online Help: Hyundai SANTAFE(CM) 2012
Component Location
General Description

Intake Air Temperature Sensor (IATS) is NTC thermister which voltage gets low if the temperature comes to be high. One is installed inside of MAFS and the other is installed between BPS and intercooler. It senses intake air temperature. In case of EURO-5 diesel engine, IATS is installed in front of turbocharger (inside of MAFS) and behind it (between BPS and intercooler). Comparing air temperature from both sensors (one is intake air temperature, the other is air temperature passing through turbo charger), more accurate sensing of intake air temperature is possible. With intake air temperature signal, ECM performs EGR control correction and fuel injection quantity correction. (MAFS is needed for EGR FEED BACK control in electronically controlled diesel engine. The calculation of air density at certain temperature is required to perform EGR FEED BACK control correctly.)

note

In case of replacing MAFS, perform the "COMPONENT CHANGE ROUTINE" procedure with scan tool. If the "COMPONENT CHANGE ROUTINE" procedure has not completed until automatic learning completed, it may cause vehicle performance and exhaust gas problem.



DTC Description

P0098 is set when the voltage above 4965mV - maximum output voltage of IATS(between BPS and intercooler) - is detected for more than 2.0 sec.. This code is due to 1) open or 2)short to battery in IATS signal circuit.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

Voltage monitoring

IATS #2 Circuit problem

Faulty IATS #2

Enable Conditions

IG key ON

Threshold Value

Voltage is over maximum value (4965mV).

Open in signal circuit.

Short to battery in signal circuit

Diagnostic Time

2 sec.

Fail Safe

Fuel cut

NO

Fixed at 28?.

EGR Off

NO

Fuel Limit

NO

Check Lamp

OFF

Specification

Temp.

- 40?

-20?

0?

20?

40?

60?

80?

Resistance

40.93~48.35K?

13.89~16.03K?

5.38~6.09K?

2.31~2.57K?

1.08~1.21K?

0.54~0.62K?

0.29~0.34K?

Diagnostic Circuit Diagram
Signal Waveform & Data

Fig.1) The voltage is 2.32V when intake air temperature is 30 ?.

And the voltage decreases when the temperature ascends