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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Hybrid/EV System Heating And Cooling) >> Diagnostic Information and Procedures >> DTC P0CED, P1F44 or P1F45: Hybrid/EV Electronics Coolant Pump Enable Circuit >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different variant/trim than selected.

The hybrid/EV electronics coolant pump circulates coolant through the power electronics coolant radiator and the drive motor generator power inverter module to control the temperature of the module.

The Enable, Control and Feedback circuits connect the hybrid/EV powertrain control module 2 to the hybrid/EV electronics coolant pump.

When the Enable circuit is high, the pump is allowed to operate as specified by the Control circuit signal. The pulse-width modulated Control circuit signal from the hybrid/EV powertrain control module 2 determines the hybrid/EV electronics coolant pump speed. The higher the duty cycle the higher the pump speed. The hybrid/EV electronics coolant pump utilizes a pulse-width modulated signal on the Feedback circuit to the hybrid/EV powertrain control module 2. During normal operation, the feedback circuit provides pump speed information to the hybrid/EV powertrain control module 2. If the hybrid/EV electronics coolant pump determines there is an internal fault it provides this information on the same feedback circuit instead of pump speed information.

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