Communication and Hosted Diagnostics
WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
The HPCM is the host controller for diagnostic trouble code (DTC) information for the following control modules:
- Accessory DC power converter module (APM)
- Battery energy control module (BECM)
- Motor control module (MCM) 1
- Motor control module (MCM) 2
- Auxiliary transmission fluid pump (ATFP) control module
The BECM will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the BECM to the HPCM through the Hybrid LAN communication circuit.
In the event a hosted module communicates a fault condition, the HPCM will determine if hybrid operation is affected and notify the vehicle operator by requesting the MIL illuminate and/or by displaying a hybrid service required message. In addition, the HPCM 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 HPCM.