2010 Cadillac CTS Sedan AWD V6-3.6L Page 1941
P2227
* Before the ECM can report DTC P2227 failed, DTCs P0100, P0101, P0102, P0103, P0121, P0122, P0123, P0221, P0222, P0223, P2228,
and P2229 must run and pass.
* The engine is operating for greater than 1 s.
* The mass air flow sensor signal is valid.
* The evaporative emission (EVAP) leak test is not enabled.
* DTC P2227 runs continuously once the above conditions are met for 2 s.
P2228 or P2229
* The engine is operating.
* The DTCs run continuously once the above conditions are met for 2 s.
Conditions for Setting the DTC
P2227
* The ECM detects that the BARO pressure is less than 50 kPa or greater than 115 kPa and DTC P2228 or P2229 is not set.
* The ECM detects that the BARO pressure changed greater than 10 kPa within 20 s.
* The ECM detects that the BARO pressure changed greater than 30 kPa since the last ignition cycle, and the difference between the BARO
signal and the calculated BARO is greater than 2 kPa. The condition exists within 1 s of engine start up.
* DTC P2227 sets if any of the conditions above exist for greater than 1 s.
P2228
The ECM detects that the BARO sensor voltage is less than 0.20 V for 1 s.
P2229
The ECM detects that the BARO sensor voltage is greater than 4.87 V for 1 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 (LLT) (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)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Start the engine. Observe the DTC information with a scan tool. DTCs P2227, P2228, or P2229 should not set.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Inspect the atmospheric vent on the K20 ECM case for one of the following conditions:
* Moisture in the vent inlet
* Debris in the vent inlet
瀚慖f a condition exists, attempt to clean or dry the atmospheric inlet.
2. Start the engine. Observe the DTC information with a scan tool. DTCs P2227, P2228, or P2229 should not set.
