2010 Cadillac Truck SRX FWD V6-3.0L Page 2024
DTC P2257
- Secondary Air Injection Pump Relay Control Circuit Low Voltage
DTC P2258
- Secondary Air Injection Pump Relay Control 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. Ignition voltage is supplied directly to the secondary air injection pump relay. The
engine control module (ECM) controls the relay by grounding the control circuit with a solid state device called a driver. The driver is equipped
with a feedback circuit that is pulled-up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a
voltage by monitoring the feedback voltage.
Conditions for Running the DTC
* The engine speed is greater than 80 RPM.
* The ignition voltage is between 10-18 V.
* The ECM has commanded the air pump relay ON and OFF at least once during the ignition cycle.
* The DTCs run continuously when the above conditions are met.
Conditions for Setting the DTC
P0418
The ECM detects the secondary air injection pump relay control circuit is open.
P2257
The ECM detects the secondary air injection pump relay control circuit is shorted to ground.
P2258
The ECM detects the secondary air injection pump relay control circuit is shorted to voltage.
Action Taken When the DTC Sets
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
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