DTC P2258: Secondary Air Injection (AIR) System Control A Circuit High

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.

P2258 - SECONDARY AIR INJECTION (AIR) SYSTEM CONTROL A CIRCUIT HIGH

Description:	The AIR system monitor circuit is high, indicating the electrical AIR pump is on although the electrical AIR pump was commanded off by the powertrain control module (PCM).
Possible Causes:	AIR relay fault - stuck closed AIR pump fault - circuit open in motor Open ground to AIR pump Open AIR monitor circuit between the AIR pump and the PCM Short to voltage in the AIR relay to AIR pump voltage circuit
Diagnostic Aids:	The AIR monitor circuit PCM input contains a pull up voltage through a resistance internal to the PCM. This voltage is normally held low by the resistance path through the AIR pump when the pump is off.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to HM: Secondary Air Injection (AIR) System STEP HM49.