Power Up Sequence

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

The PCM conducts a power up sequence every time the ignition is turned from the OFF to the START position. The power up sequence is carried out only with the electronically controlled CVT gear selector in the PARK position. During the power up sequence the PCM:

initializes and begins CAN communications with the TCM and the TBCM.
checks for TCM error status.
requests the TBCM to close the high voltage contactors.
enables the DC/DC converter.
starts the internal combustion engine.

If a concern is detected during the power up sequence, the PCM may initiate LOS mode and store a DTC.