2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1865
DTC P0418, P2257, and P2258 are Type B DTCs.
Conditions for Clearing the DTC
DTC P0418, P2257, and P2258 are Type B DTCs.
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 SAIR 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, command the secondary air injection pump relay ON and OFF with a scan tool. You should hear an audible click or the
secondary air injection pump should turn ON and OFF.
2. 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, remove the KR25 secondary air injection pump relay.
2. 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.
3. Verify that a test lamp illuminates between the secondary air injection pump relay coil B+ circuit terminal 86 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 ignition circuit fuse is open, test all components connected to the ignition circuit and replace as necessary.
4. Connect a test lamp between the control circuit terminal 85 and the secondary air injection pump relay coil B+ circuit terminal 86.
5. Command the secondary air injection pump relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing
between the commanded states.
瀚慖f the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 engine control
module.
瀚慖f the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace
the K20 engine control module.
6. If all circuits test normal, test or replace the KR25 secondary air injection pump relay.
