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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 123 (Engine Controls And Fuel - 3.6L (LF4) - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC P0685-P0687, P0689, P0690, P1682, P16A7, P16AF, P16B3, P16BC, P16BD, or P16BF >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
Circuit* Description
B+ - Relay Coil Supplied directly from the battery.
B+ - Relay Switch Supplied directly from the battery.
Control - Component The output circuit is switched to 12 V to activate the component.
Control - Relay Coil The output circuit is switched to ground to activate the component.
*For detailed component terminal information, refer to: Diagnostic Aids
Component Description
K20 Engine Control Module The control module contains a microprocessor used to process input data to control outputs.
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.
KR75 Engine Controls Ignition Relay Relays are used to control a high power circuit with a low power signal.

There are 3 ignition voltage circuits supplied to the ECM. The 3 circuits are supplied by 2 relay (s): KR73 Ignition Main Relay & KR75 Engine Controls Ignition Relay

The ECM monitors and compares the voltages supplied by the relay (s).

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