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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0443 To DTC P3452 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0685, P0686, P0687, P0689, P0690 Or P1682: Engine Controls Ignition Relay Control Circuit >> Circuit/System Description

Circuit/System Description

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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.

3 ignition voltage circuits supply the ECM. The 3 circuits are supplied by 1 relay(s):KR75 Engine Controls Ignition Relay

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

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