DTC P1229: - Charge Air Cooler (CAC) Pump Driver

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2009 Mercury Mountaineer, 2009 Mercury Milan, 2009 Mercury Mariner, 2009 Mercury Grand Marquis, and 2009 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

DTC P1229: - CHARGE AIR COOLER (CAC) PUMP DRIVER

Description:	This DTC sets when the powertrain control module (PCM) commands the supercharger CAC pump to operate but no current is detected.
Possible Causes:	CAC pump motor open circuit CAC pump relay coil open Open circuit between the relay and pump CAC pump motor shorted Open circuit between the PCM and the relay Poor CAC pump ground connection
Diagnostic Aids:	Check for voltage at the relay. Check the fuse in the voltage circuit. Check the ground connection of the CAC pump motor.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to Pinpoint Test KP .