Power Up Sequence

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

The PCM must conduct a power-up sequence every time the key 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 the concern is detected during the power up sequence, the PCM may initiate LOS mode and store a DTC.