Continuing with the Hybrid Electric Control Software:
NOTE: The following is general information only and and may not be complete. This information is for discussion only and not to be used for problem solving with your specific car. This information is not intended to replace or supersede any warranty, parts and service policy, Work Shop Manual (WSM) procedures or technical training or wiring diagram information. Seek qualified automotive help if your car is having drive-ability problems.
Normal Power Down Sequence
The TCM must conduct a normal power down sequence. Whenever the ignition is turned to the OFF or ACC position, modules powered up by the ISP-R circuit immediately shut down. However the PCM, TCM, and the battery energy control module (BECM) stay on, until the power down sequence is complete. The PCM and TCM stay powered by controlling their own dedicated power relays. The BECM is powered directly from the low voltage battery which permits wake-up function when the vehicle is off. During the power down sequence the TCM:
• requests the PCM to cut power to the injectors and ignition coils (engine shut down).
• disables the high voltage inverters.
• requests the BECM to disable the DC/DC converter.
• requests the BECM to open the high voltage contactors.
• discharges the high voltage inverter capacitors. • opens the TCM power relay.
If the power down sequence does not execute correctly, it is considered an abnormal shut down which may result in the PCM, the TCM and the BECM storing DTCs.
Power Up Sequence
The TCM conducts a power up sequence every time the ignition is turned from the OFF to the START position, if the gear selector is in PARK or NEUTRAL. During the power up sequence the TCM:
• initializes and begins controller area network (CAN) communications with the PCM and the BECM.
• requests the BECM to close the high voltage contactors.
• illuminates the green ready indicator indicating the vehicle is ready to drive in electric, gasoline,
or a combination of electric and gasoline modes.
• if required, requests the PCM to start the internal combustion engine. The internal combustion engine will not start if the gear selector is in NEUTRAL. The internal combustion engine starts if it is required for cabin heating, windshield defrost or the outside temperatures are low. The internal combustion engine also starts if the high voltage battery charge is low.
If a concern is detected during the power up sequence, the TCM may initiate LOS mode and store a DTC.
Edited by GrySql, 17 October 2015 - 07:54 PM.