2010 Cadillac Truck SRX FWD V6-3.0L Page 2047

2010 Cadillac Truck SRX FWD V6-3.0L Page 2047

5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1. Verify the scan tool Secondary

Air Injection Pressure Sensor voltage parameter is greater than 4.8 V.

瀚慖f less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the

K20 ECM.

6. If all circuits test normal, test or replace the B157 secondary air injection pressure sensor.

Repair Instructions

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

* 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

P2432

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).