P1229 - Charge Air Cooler (CAC) Pump Driver

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2007 Mercury Mountaineer, 2007 Mercury Monterey, 2007 Mercury Montego, 2007 Mercury Milan, and 2007 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.

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	refer to PINPOINT TEST KP .