2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1916

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1916

* Secondary Injection Shutoff Valve Pressure Sensor Replacement (See: Powertrain Management/Emission Control Systems/Air Injection/Air

Injection Check Valve/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

P2433

DTC P2431-P2433

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 P2431

- Secondary Air Injection System Pressure Sensor Performance

DTC P2432

- Secondary Air Injection System Pressure Sensor Circuit Low Voltage

DTC P2433

- Secondary Air Injection System Pressure Sensor Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The secondary air injection system aids in the reduction of hydrocarbon emissions during a cold start. The electric air pump forces fresh air into the

exhaust stream in order to accelerate the catalyst operation. A secondary air injection pressure sensor is used to monitor the air flow from the

secondary air injection pump. The engine control module (ECM) supplies voltage to the 5 V reference circuit and provides a ground for the low

reference circuit. The sensor provides a signal voltage to the ECM relative to the pressure changes within the secondary air injection system.

Conditions for Running the DTC

P2431

* DTC P0100, P0101, P0102, P0103, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P050C, P2227, P2228, or P2229 is not set.

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

* Battery voltage is between 10-18 V.

* Engine speed is 680-3,500 RPM.

* Intake air temperature is between -12 to +80掳C (10.4-176掳F).

* Engine coolant temperature is between -10.5 to +69.8掳C (13-158掳F).

* Mass airflow is less than 100 g/s.

* Catalyst heating is active.

* Current altitude is less than 3,000 m (9,843 ft).

* The difference between intake air temp and engine coolant start temp is less than 15掳C (59掳F).

* The DTC runs once per ignition cycle when the above conditions exist.

P2432 or P2433

* The ignition is ON, or the engine is operating.

* The DTCs run continuously when the above condition exists for greater than 1 s.

Conditions for Setting the DTC