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Component Location

General Description

Boost Pressure Sensor(BPS) is installed in intake manifold and senses the pressure of air inside of intake manifold which is compressed by turbo charager.

Measuring mass air flow accurately with the information of intake mainfold pressure, mass air flow and intake air temperature, ECM performs actuating correction of EGR and VGT.

When excessive intake manifold pressure is detected, engine power generation is limited to protect engine because too highly compressed pressure due to turbo charger may harm engine.

DTC Description

P0069 is set when the difference between BPS output voltage and atmospheric pressure sensor output voltage is above 300hpa at below 100RPM(in other word, IG KEY ON condition) for more than 3.0 sec. This code is due to abnormal output characteristic of BPS component.

DTC Detecting Condition

Item	Detecting Condition			Possible Cause
DTC Strategy	● Voltage monitoring			● BPS circuit ● BPS component
Enable Conditions	● IG KEY "ON" (below 100RPM)
Threshold Value	● \|Boost pressure - Barometric pressure\| is above 300hpa.
Diagnostic Time	● 3.0 sec.
Fail Safe	Fuel cut	YES	● Boost pressure is fixed at 1000 hpa.
	EGR Off	NO
	Fuel Limit	NO
	Check Lamp	NO

Specification

Pressure [Kpa]	20	100	190	250
Outpur voltage [V]	0.4±0.077	1.878±0.063	3.541±0.063	4.650±0.077

Diagnostic Circuit Diagram

Signal Waveform

Fig.1) This is the waveform of BPS as accelerating from idle state. Signal voltage rises as accelerating.

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 "BOOST PRESSURE SENSOR" parameter on the GDS.

Specification : 1000hpa ± 100hpa at idle

Fig.1) Monitor "BOOST PRESSURE SENSOR" parameter on the GDS at idle after warming engine up.

1000hpa ± 100hpa(approx. 1 atm) is correct value.

Terminal and Connector Inspection

Electrical systems consist of a lot of harness and connectors, poor connection of terminals can cause various problems and damge of component.

Perform checking procedure as follows.

(1)

Check damage of harness and terminals : Check terminals for contact resistance, corrosion and deformation.

(2)

Check connecting condition of ECM and component connector : Check terminal seperation, damage of locking device and connecting condition between terminal and wiring.

note

Disconnect the pin which requires checking at male connector and insert it to the terminal at female connector for checking connecting condition. ( after checking, reconnect the pin at correct position. )

Is the problem found?

	▶ Repair the trouble causing part and go to "Verification of Vehicle Repair".
	▶ Go to "Component Inspection ".

Component Inspection

BPS visual iInspection

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect BPS connector.

(3)

Check if corrosion and damage in BPS terminal is detected.

(4)

Check BPS mounting state, leakage at O′ring, clogged carbon at pressure detecting hall.

(5)

Are the problems relevant to BPS found?

	▶ Replace BPS if necessary and go to "Verification of Vehicle Repair".
	▶ Go to "2. Check BPS output voltage at IG KEY ON" as follows.

Check BPS output voltage at IG KEY ON

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Connect GDS to Data Link Connector (DLC).

(3)

IG KEY "ON"

(4)

Monitor "ATMOSPHERIC PRESSURE" and "BOOST PRESSURE SENSOR" parameters on GDS.

(5)

Check if both "ATMOSPHERIC PRESSURE" and "BOOST PRESSURE SENSOR" indicates similar value at IG KEY "ON".

Specification : Refer to "Monitor GDS Data" of Scantool diagnostics parameters.

(6)

Is any BPS related problem is detedcted?

	▶ Go to "Verification of Vehicle Repair".
	▶ Replace BPS and go to "Verification of Vehicle Repair".

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.