P1229 - Charge Air Cooler (CAC) Pump Driver

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.

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 .