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Component Location

General Description

Atmospheric sensor is installed in ECM and senses atmospheric pressure where the vehicle is.

Based on singal of atmospheric sensor, air density is calculated. And atmospheric sensor is used to detect mass air flow with MAFS, IATS.

This sensor is required to perform 1) fuel injection quantity correction in high altitude and 2) EGR control.

Atmospheric pressure is fixed at 900hpa when atmospheric sensor fails.

DTC Description

P0108 is set when the voltage above 4.85V - maximum output voltage of Barometric pressure sensor - is detected for more than 5sec.. This code is due to fhe failure of the sensor inside of ECM.

DTC Detecting Condition

Item	Detecting Condition			Possible Cause
DTC Strategy	● Voltage monitoring			● Atmospheric pressure sensor(ECM component)
Enable Conditions	● IG KEY "ON"
Threshold Value	● When output voltage is above the maximum value. (above 4.85V)
Diagnostic Time	● 0.8sec
Fail Safe	Fuel cut	NO	● Barometric pressure is fixed at 900hpa.
	EGR Off	YES
	Fuel Limit	YES
	MIL	NO

Specification

1atm is same as

hpa (hecto pascal)	mb	mmHg
1013	1013	760

Monitor GDS Data

Connect GDS to Data Link Connector (DLC).

Warm engine up to normal operating temperature.

Turn "OFF" electrical devices and A/C.

Monitor "ATMOSPHERIC PRESS. SNSR " parameter on the GDS.

Specification : Approx. 1 atm is displayed

Fig.1) The atmospheric pressure where the vehicle is displayed. Atmospheric pressure decreases as vehicle going up to higher altitude. The pressure at average level of sea surface is regarded as 1atm and, check if the pressure different from 1 atm is displayed. ( 1 atm is correct pressure)

Component Inspection

ECM Component Inspection

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect ECM.

(3)

Replace ECM, check if abnormal operations disappear.

(4)

If problems are corrected, replace ECM.

note

Input injector IQA data(7 letters) using GDS at replacing ECM.

Enter the driving distance - how many km the CPF is used- into New ECM with scanner.

For immobilizer applied vehicle, input pin code.

Verification of Vehicle Repair

After a repair, it is essential to verify that the fault is corrected.

After connecting GDS select "Diagnostic Trouble Codes(DTCs)" mode to and then clear DTC.

Drive the vehicle within DTC Enable conditions in General information.

After selecting "Diagnostic Trouble Codes(DTCs)" mode and check DTC is recorded again.

Are any DTCs recorded ?

	▶ Go to the DTC guide of recorded NO. in GDS.
	▶ System operates within specification.