2010 Cadillac CTS Sedan AWD V6-3.0L Page 1905

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1905

瀚慖f the BARO sensor pressure is not within the range specified for your altitude, refer to DTC P2227, P2228, or P2229 (LLT) ( See: P

Code Charts/P2227).

3. Engine at normal operating temperature, observe the scan tool Long Term Fuel Trim parameters. The LT FT Cruise/Accel parameters should

be less than 33 %. The LT FT Idle/Decel parameters should be less than 7 %.

瀚慖f not within the specified range, verify none of the following conditions exist:

* The heated oxygen sensor (HO2S) is installed securely and the electrical connector is not contacting the exhaust system.

* Missing, restricted, or leaking exhaust components-Refer to Symptoms - Engine Exhaust (See: Engine, Cooling and Exhaust/Exhaust

System/Testing and Inspection/Symptoms - Engine Exhaust).

* The air intake system after the MAF sensor for vacuum leaks

* A mass air flow (MAF) sensor signal that is skewed-If the Short Term FT parameters for both banks changes greater than 20 % when the

MAF sensor is disconnected, refer to DTC P0101 (w/LLT) (See: P Code Charts/P0101)DTC P0101 (LF1) (See: P Code Charts/P0101).

* Fuel contamination-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool) (See: Powertrain Management/Computers

and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Alcohol/Contaminants-in-Fuel Diagnosis (with

Special Tool))Alcohol/Contaminants-in-Fuel Diagnosis (without Special Tool) (See: Powertrain Management/Computers and Control

Systems/Testing and Inspection/Component Tests and General Diagnostics/Alcohol/Contaminants-in-Fuel Diagnosis (without Special

Tool)) and Fuel System Cleaning (See: Powertrain Management/Fuel Delivery and Air Induction/Service and Repair).

* Splits, kinks, or improper connections at the vacuum hoses

* The fuel system is operating lean. Refer to Fuel System Diagnosis (See: Powertrain Management/Computers and Control

Systems/Testing and Inspection/Component Tests and General Diagnostics/Fuel System Diagnosis).

* Vacuum leaks at the intake manifold or throttle body

* Leaking crankcase ventilation system

* The engine control module grounds for being clean, tight, and in the correct locations

* A high engine oil level condition-A high engine oil level causes oil residue to form on the mass air flow (MAF) sensor, causing a lean

indication. The MAF sensor does not need to be replaced.

* Vacuum leaks that only affect one bank of the engine-For example, the intake manifold, the injector O-rings.

* Lean injectors-Refer to Fuel Injector Solenoid Coil Test (w/LLT) (See: Powertrain Management/Computers and Control

Systems/Testing and Inspection/Component Tests and General Diagnostics/Fuel Injector Solenoid Coil Test)Fuel Injector Solenoid Coil

Test (w/LF1) (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Injector/Testing and Inspection).

* An engine mechanical condition-Refer to Symptoms - Engine Mechanical (See: Engine, Cooling and Exhaust/Engine/Testing and

Inspection/Symptom Related Diagnostic Procedures/Symptoms - Engine Mechanical).

4. 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.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

P2180

DTC P2178, P2180, P2188, or P2190 (w/LLT)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P2178

- Fuel Trim System Rich at Cruise or Acceleration Bank 1

DTC P2180

- Fuel Trim System Rich at Cruise or Acceleration Bank 2

DTC P2188

- Fuel Trim System Rich at Idle Bank 1

DTC P2190

- Fuel Trim System Rich at Idle Bank 2

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1419

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1419

P0700, P2227, P2228, or P2229 is not set.

* The engine is operating.

* The BARO is greater than 68 kPa.

* The fuel level is between 11-88 percent.

* The ECM has commanded the EVAP canister purge solenoid OFF.

* The ECM has commanded the EVAP canister vent valve open.

OR

* The fuel level is less than 60 percent, 73 percent for LLT.

* The vehicle speed is between 10-76 km/h (6-47 mph) for greater than 30 seconds.

* The ECM has commanded the EVAP canister purge solenoid ON.

OR

* The calculated ambient air temperature is between 4-35掳C (39-95掳F) for greater than 3 seconds.

* DTC P0451 runs continuously when the above conditions are met for approximately 7 seconds.

Conditions for Setting the DTC

P0450

The ECM detects that the FTP sensor signal oscillates greater than 6.09 mm/Hg (3.26 in. H2O) for 4 seconds, or for a cumulative of 30 seconds.

P0451

* The ECM detects that the FTP is less than -26.2 mm/Hg (-14.1 in. H2O) or greater than 11.0 mm/Hg (5.9 in. H2O) for 4 seconds or for a

cumulative of 30 seconds.

OR

* The ECM detects a change in the zero point of FTP sensor signal greater than +/-5.16 mm/Hg (2.76 in. H2O) from the zero point at start up

for 4 seconds, or a cumulative of 30 seconds.

Action Taken When the DTC Sets

DTCs P0450 and P0451 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0450 and P0451 are Type B DTCs.

Diagnostic Aids

A blocked or clogged EVAP canister vent may set these 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)

Description and Operation

Fuel System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Fuel System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

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

Special Tools

* J 41413-SPT High Intensity White Light

* J 41413-VLV EVAP Port Vent Fitting Tool

* J 41413-200 Evaporative Emissions System Tester (EEST)

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2874

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2874

P2228

The ECM detects the BARO voltage is less than 2 V for greater than 1 s.

P2229

The ECM detects the BARO voltage is greater than 4.5 V for greater than 1 s.

Action Taken When the DTC Sets

DTCs P2228 and P2229 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P2228 and P2229 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

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

Special Tools

* J-23738-A Mityvac

* J-35555 Metal Mityvac

Circuit/System Verification

1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description ( See: Hybrid Drive

Systems/Description and Operation/Hybrid Modes of Operation).

2. Ignition ON, verify the scan tool hood position parameter displays Open.

瀚慖f the hood position does not display Open, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for DTC P254F.

3. Ignition ON, observe the scan tool DTC information. Verify that DTCs P0641 or P0651 are not set.

瀚慖f a DTC is set, refer to DTC P0641 or P0651 (See: P Code Charts/P0641).

4. Ignition ON, observe the scan tool BARO parameter and compare the value to the Altitude Versus Barometric Pressure (See: Powertrain

Management/Computers and Control Systems/Specifications/Altitude Versus Barometric Pressure) table. The parameter should be within the

range specified in the table for the current altitude.

5. 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. Ignition OFF, disconnect the harness connector at the BARO sensor.

2. Ignition OFF for 2 minutes and scan tool powered OFF, test for less than 5 ohm between the low reference circuit terminal 2 and ground.

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1340

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1340

* DTC P0100, P0101, P0102, P0103, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0418, P050C, P2227, P2228, P2229,

P2257, or P2258 is not set.

* Greater than 60 min has elapsed since the last cold start.

* The secondary air injection system has been commanded ON and OFF during the ignition cycle.

* The battery voltage is between 10-18 V.

* The engine speed is between 680-3,500 RPM.

* The Intake Air Temperature (IAT) is between -12 to +80掳C (10.4-176掳F).

* The Engine Coolant Temperature (ECT) is between -10.5 to +69.8掳C (13-158掳F).

* The Mass Air Flow (MAF) is less than 100 g/s.

* Catalyst heating is active.

* The Barometric Pressure (BARO) is less than 68 kPa (9.9 psi).

* The difference between intake air temp and engine coolant start temp is less than 15掳C (27掳F).

* DTC P0411 runs once per ignition cycle when the above conditions are met.

Conditions for Setting the DTC

* The ratio of the calculated secondary air mass flow to the modeled secondary air mass flow is less than 0.75 or greater than 1.2.

* DTC P0411 sets within 60 s when the above condition is met.

Action Taken When the DTC Sets

DTC P0411 is a Type B DTC.

Conditions for Clearing the DTC

DTC P0411 is a Type B DTC.

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

Secondary Air Injection System Description (See: Powertrain Management/Emission Control Systems/Air Injection/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

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

Note: Do not run secondary air injection pump for more than 1-2 minutes at a time. Running for an extended period of time without allowing

pump to cool may cause damage to the pump.

1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P2431, P2432, or P2433 is not set.

瀚慖f a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble

Code (DTC) List - Vehicle) for further diagnosis.

2. Observe the scan tool Secondary Air Injection Pressure Sensor voltage parameter. The reading should be between 1.0-4.0 V.

3. Compare the scan tool BARO pressure parameter to the Altitude Versus Barometric Pressure (See: Powertrain Management/Computers and

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1942

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1942

瀚慖f DTC P2227, P2228, or P2229 sets, replace the K20 ECM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning) for engine control module replacement, setup, and

programming

P2229

DTC P2227, P2228, or P2229 (LLT)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

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, 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.