2010 Cadillac Truck SRX AWD V6-3.0L Page 1484
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
Control Systems/Specifications/Altitude Versus Barometric Pressure) table. The BARO should be within the specified range displayed in the
table for the specific altitude.
瀚慖f not within the specified range, refer to DTC P2227, P2228, or P2229 (LAU) (See: P Code Charts/P2227) for further diagnosis.
4. Ignition ON, command the Secondary Air Injection Pump Relay ON and OFF with a scan tool. The secondary air injection pump should turn
ON and OFF.
5. Engine running, command the Secondary Air Injection Pump Relay ON with a scan tool while observing the Secondary Air Injection
Pressure Sensor parameter. The reading should change greater than 10 kPa (1.45 psi).
6. 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 secondary air injection system for the following conditions:
* Hoses/pipes for a restriction or blockage
* Hoses/pipes for being disconnected
* Plugged secondary air injection pressure sensor port
* Damaged secondary air injection check valve
瀚慖f a condition is located, repair as necessary.
瀚慖f a condition is not located and the secondary air injection pump operates with no pressure change, replace the G21 secondary air
injection pump.
2. Ignition OFF, remove the KR25 secondary air injection pump relay.
3. Ignition ON, verify that a test lamp does not illuminate between the controlled output circuit terminal 30 and ground.
瀚慖f the test lamp illuminates, test the controlled output circuit for a short to voltage.
4. Verify that a test lamp illuminates between the secondary air injection pump relay switch B+ circuit terminal 87 and ground.
瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and
the relay coil ignition circuit fuse is open, test all components connected to the ignition circuit and replace as necessary.
5. Connect a 20 A fused jumper wire between the secondary air injection pump relay switch B+ circuit terminal 87 and the controlled output
circuit terminal 30. The G21 secondary air injection pump should turn ON.
瀚慖f the secondary air injection pump does not activate, test the controlled output circuit and the secondary air injection pump ground circuit
for an open/high resistance. If the circuits test normal, test or replace the G21 secondary air injection pump.
6. If all circuits test normal, replace the KR25 secondary air injection pump relay.
