2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1857

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1857

DTC Descriptors

DTC P2227

- Barometric Pressure (BARO) Sensor Performance

DTC P2228

- Barometric Pressure (BARO) Sensor Circuit Low Voltage

DTC P2229

- Barometric Pressure (BARO) Sensor Circuit High Voltage

Circuit/System Description

The barometric pressure (BARO) sensor responds to changes in altitude and atmospheric conditions. This gives the engine control module (ECM)

an indication of barometric pressure. The ECM uses this information to calculate fuel delivery. The BARO sensor is located within the controller

and is not serviced as a separate unit. The BARO sensor provides a voltage signal to the ECM relative to the atmospheric pressure changes. The

ECM monitors the BARO sensor signal for a voltage outside of the normal range.

Conditions for Running the DTC

P2227

* Before the ECM can report DTC P2227 failed, DTCs P0100, P0101, P0102, P0103, P0111, P0112, P0113, P0114, P0121, P0122, P0123,

P0221, P0222, P0223, P0236, P0237, P0238, P2228, and P2229 must run and pass.

* The engine is operating.

* The engine speed is less than 1,120 RPM.

* The throttle position sensor parameter is less than 10 %.

* DTC P2227 runs whenever the above conditions are met.

P2228 or P2229

* The ignition is ON.

* The DTCs run continuously when the above condition is met for 0.2 s.

Conditions for Setting the DTC

P2227

* The ECM detects that the BARO sensor signal plus a calibrated threshold is less than the boost pressure sensor signal plus a calibrated

threshold for more than 9 s.

OR

* The ECM detects that the BARO sensor signal plus a calibrated threshold greater than the boost pressure sensor signal plus a calibrated

threshold for more than 9 s.

OR

* The ECM detects that the BARO pressure changed greater than 5 kPa (0.7 psi) within 20 s.

OR

* The ECM detects that the BARO pressure changed greater than 10 kPa (1.5 psi) since the last ignition cycle.

P2228

* The ECM detects that the BARO sensor voltage is less than 0.20 V for 0.5 s.

OR

* The ECM detects that the BARO sensor signal is less than 45 kPa (6.5 psi) for 2 s

P2229

* The ECM detects that the BARO sensor voltage is greater than 4.8 V for 0.5 s.

OR

* The ECM detects that the BARO sensor signal is greater than 115 kPa (16.7 psi) for 2 s.

Action Taken When the DTC Sets

DTCs P2227, P2228, and P2229 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P2227, P2228, and P2229 are Type B DTCs.

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