Hybrid Powertrain Control Module
Location
The hybrid/EV powertrain control module 1 is a non-serviceable, flash-programmable microprocessor contained within the power inverter module.
Operating Functions
The hybrid/EV powertrain control module 1 is the main controller of powertrain operation. The hybrid/EV powertrain control module 1 determines when to perform normal operating modes such as electric mode, extended range mode and regenerative braking. The hybrid/EV powertrain control module 1 also operates in conjunction with the hybrid/EV powertrain control module 2 to determine when to enable and disable the DC high voltage circuits. Each motor control module operates the applicable motor based upon hybrid/EV powertrain control module 1 commands.
Communication and Hosted Diagnostics
The hybrid/EV powertrain control module 1 is the host controller for DTC information for the following control modules:
- Drive motor 1 control module
- Drive motor 2 control module
- Electric auxiliary fluid pump motor assembly
These modules diagnose their own operation and determine when a fault condition is present.
The motor control modules and the hybrid/EV powertrain control module 1 exchange information and commands on a serial peripheral interface bus internal communication circuit as well as the hi-speed GMLAN communication circuit.
In the event a hosted module communicates a fault condition, the hybrid/EV powertrain control module 1 will determine if one or more operating modes are affected and notify the vehicle operator by requesting the MIL illuminate and/or by displaying a message in the Driver Information Center. In addition, the hybrid/EV powertrain control module 1 will store the associated DTC information for retrieval by a scan tool. Some hosted modules may require an ignition cycle to clear certain DTCs from the hybrid/EV powertrain control module 1.
Circuit Inputs
In addition to data parameters, the hybrid/EV powertrain control module 1 directly monitors the following signal circuits:
- Transmission internal mode switch direction and Park/Neutral switch signals
- Crankshaft position sensor signal