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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P0685-P0687, P0689, P0690, P1682, P16A7, P16AF, or P16B3 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different variant/trim than selected.
Circuit Description
B+ - Relay Coil Supplied directly from the battery.
B+ - Relay Switch Supplied directly from the battery.
Ignition - Component - Terminal 87 Supplied from a relay.
Control - Relay Coil The output circuit is switched to ground to activate the component.
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.

2 ignition voltage circuits supply the ECM. The 2 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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