P2257 - Secondary Air Injection (Air) System Control A Circuit Low
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2008 Mercury Sable, 2008 Mercury Mountaineer, 2008 Mercury Milan, 2008 Mercury Mariner, and 2008 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P2257 - SECONDARY AIR INJECTION (AIR) SYSTEM CONTROL A CIRCUIT LOW
| Description: | The AIR system monitor circuit is low, indicating the secondary AIR pump is off although the secondary AIR pump was commanded on by the powertrain control module (PCM). | |||
| Possible Causes: |
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| 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 secondary AIR pump when the secondary AIR pump is off. A single electrical open circuit component such as an AIR relay coil in this multi-component circuit is not detected by the PCM output driver, yet it sets DTC P2257. |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory | |
| All | refer to PINPOINT TEST HM . | |||