2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1174
* Intake air temperature (IAT)
* Barometric pressure (BARO)
* Efficiency of the charge air cooler
The sensor provides a signal voltage to the engine control module (ECM), relative to the pressure changes, on the boost pressure sensor signal
circuit. Under normal operation the greatest pressure that can exist in this portion of the induction system at ignition ON, engine OFF is equal to the
BARO. When the vehicle is operated at wide-open throttle (WOT) the turbocharger can increase the pressure to near 240 kPa (35 psi). The least
amount of pressure that occurs is when the vehicle is idling or decelerating, and it is equal to the BARO.
Conditions for Running the DTC
P0236
* DTCs P0121, P0122, P0123, P0221, P0222, P0223, P0237, P0238, P2227, P2228, or P2229 are not set.
* The engine is running.
* The engine speed is less than 1,120 RPM.
* The Throttle Position Sensor parameter is less than 10%.
* This DTC runs continuously within the enabling conditions.
P0237
* The engine is running.
* This DTC runs continuously within the enabling conditions.
P0238
* The engine is running.
* This DTC runs continuously within the enabling conditions.
Conditions for Setting the DTC
P0236
* The ECM detects that the boost pressure sensor signal plus a calibrated threshold is less than the BARO sensor signal plus a calibrated
threshold.
OR
* The ECM detects that the boost pressure sensor signal plus a calibrated threshold greater than the BARO sensor signal plus a calibrated
threshold.
P0237
The ECM detects that the boost pressure sensor voltage is less than 0.45 V or the measured pressure is less than 50 kPa (7.3 psi).
P0238
The ECM detects that the boost pressure sensor voltage is greater than 4.65 V or the measured pressure is greater than 300 kPa (43.5 psi).
Action Taken When the DTC Sets
DTCs P0236, P0237, P0238, are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0236, P0237, P0238, are Type B DTCs.
Diagnostic Aids
* Use a solution of dish soap and water in a spray bottle to pinpoint any air leaks.
* The BARO sensor is integrated within the ECM, and it has a port on the housing that allows it to sense the ambient pressure. Any restriction
at this opening may hinder the operation of the BARO sensor.
Reference Information
Schematic Reference
Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics
(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Turbocharger System Description (See: Powertrain Management/Fuel Delivery and Air Induction/Turbocharger/Description and Operation)
Electrical Information Reference
