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Home >> Chevrolet >> 2017 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Cooling System) >> Diagnostic Information and Procedures >> DTC P00B7, P0597-P0599, or P2181 - E41 Engine Coolant Thermostat Heater Malfunction >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

For an overview of the component/system, refer to:Cooling System Description and Operation 

Circuit Description
Ignition Supplied from a fuse.
Control The output circuit is switched to ground to activate the component.
The output is PWM controlled.
Component Description
E41 Engine Coolant Thermostat Heater The thermostat has a build-in heating resistor. When the resistor heats up, the thermostat opens more, resulting in a lower engine operating temperature.
The thermostat has a mechanical fail-safe in case of an electrical condition with the thermostat heater. The mechanical thermostat will open at approximately 103°C (217°F) and cycle between 105°C (221°F) and 110°C (230°F).
K20 Engine Control Module The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.
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