Circuit/System Description

The hybrid/EV powertrain control module 2 constantly monitors the hybrid/EV powertrain control module 2 system for any condition which may adversely affect vehicle emissions. If a condition is detected, the hybrid/EV powertrain control module 2 sets a DTC and sends a serial data message to the engine control module (ECM). The ECM sets DTC P1E00 to inform the technician that the hybrid/EV powertrain control module 2 has set the emission related DTC. The serial data message sent by the hybrid/EV powertrain control module 2 also contains a request for the ECM to illuminate the malfunction indicator lamp (MIL).

The technician can observe the DTC that was set by the hybrid/EV powertrain control module 2 by reviewing the ECM Freeze Frame records on the scan tool. The ECM Freeze Frame records also contain the engine operating conditions present when the hybrid/EV powertrain control module 2 DTC set.