Trouble Code: P2257 -
Secondary Air Injection (AIR) System Control A Circuit Low
Possible Causes:
* Open B+ circuit
* Open VPWR circuit
* Open voltage circuit between the AIR relay and the secondary AIR pump
*
Damaged AIR relayIt is most likely either a hose or line that fell off, broke or is kinked, or a bad A.I.R. pump. What you can do is unplug the A.I.R. pump connector. Ground the black wire and, with a 30 amp fused jumper wire, apply battery voltage to the white wire.
If the pump runs, then chances are the pump is good and the problem is with a hose. If not, then the A.I.R. pump will need to be replaced.
Other, this is the same DTC code that P1413 - Secondary Air Injection System Monitor Circuit Low, in Mustang, this solve...
First off I'm glad to see you've done your homework. You are correct,
the PCM is not seeing the pump turn on, and thats whats causing your
code. The only thing you got wrong is that the CCRM does not control
the Air Pump. There is a seperate solid state relay located near the
air filter that controls the pump.
You will first need to check
this relay for Power and check its grounds. First check the black and
yellow wire. If this has twelve volts then check the ground. If its
good then the relay is most likely bad if your only getting 7v at the
pump.
You can see in the diagram that the PCM just monitors the
power going to the pump. If the white wire to the pump has 12v then the
pcm is happy.
Here are the schematics to help you. This is not a
common problem with this vehicle, so I am sorry I cannot give you a
precise answer. You will need to do more testing.
We hope this information helps you solve your concern. Keep in touch.
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