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.
P0238 is set when the voltage above 4900mV - maximum output voltage of BPS - is detected for more than 2.0 sec.. This code is due to short to battery in BPS signal circuit or open in ground circuit.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy | ● Voltage monitoring | ● BPS circuit ● BPS component | ||
Enable Conditions | ● IG KEY "ON" | |||
Threshold Value | ● Output signal above maximum value(above 4900mV) | |||
Diagnostic Time | ● 2.0 sec. | |||
Fail Safe | Fuel Cut | NO | ● Boost pressure is fixed at 900 hpa. | |
EGR Off | YES | |||
Fuel Limit | YES | |||
Check Lamp | NO | |||
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 |
