Test Procedure

WARNING: This page does not describe the selected car, but rather 22 other vehicles, including the 2011 Mercury Milan, 2011 Mercury Mariner, 2011 Mercury Grand Marquis, 2011 Lincoln Town Car, and 2011 Lincoln Navigator L. However, it is still accessible from the selected car via links, so may be relevant.

DO1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)

Are DTCs P2227, P2228, or P2229 present?

Yes	No
For DTC P2227, GO to DO2. For DTCs P2228 or P2229, GO to DO3.	For all others, GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .

DO2 DTC P2227: CHECK FOR A BARO SENSOR CORRELATION CONCERN

Ignition ON, engine OFF.
Access the PCM and monitor the BARO (PRESS), MAP (PRESS) and TIP_PRS_BOOST (PRESS) PIDs.

Is the BARO pressure reading within 6.87 kPa (1 psi) of the MAP reading and 7.25 kPa (1.05 psi) of the TIP_PRS_BOOST reading?

Yes	No
The system is operating correctly at this time. Clear the PCM DTCs. REPEAT the self-test.	GO to DO3.

DO3 CHECK FOR CORRECT PCM OPERATION

Disconnect all the PCM connectors.
Visually inspect for:
- pushed out pins
- corrosion
Connect all the PCM connectors and make sure they seat correctly.
Carry out the PCM self-test.
Verify the concern is still present.

Is the concern still present?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) , PROGRAMMING THE VID BLOCK FOR A REPLACEMENT PCM .	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.