2010 Cadillac Truck SRX FWD V6-3.0L Page 2050
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
P2431
* The ECM detects that the secondary air injection pressure sensor is 5 kPa (0.7 psi) less than the BARO sensor when the secondary air
injection pump is commanded ON.
OR
* The ECM detects that the secondary air injection pressure sensor is 5 kPa (0.7 psi) greater than the BARO sensor when the secondary air
injection pump is commanded OFF.
P2432
The ECM detects that the secondary air injection pressure sensor signal is less than 0.5 V for greater than 1 s.
P2433
The ECM detects that the secondary air injection pressure sensor signal is greater than 4.5 V for greater than 1 s.
Action Taken When the DTC Sets
DTCs P2431, P2432 and P2433 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P2431, P2432 and P2433 are Type B DTCs.
