Chevrolet Sonic manuals

Chevrolet Sonic Repair Manual: Knock Sensor System Description

Circuit/System Description

The knock sensor system enables the engine control module (ECM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The ECM uses the knock sensor system to test for abnormal engine noise that may indicate detonation, also known as spark knock.

Sensor Description

This knock sensor system uses one or two flat response dual-wire sensors. The sensor uses piezo-electric crystal technology that produces an alternating current (AC) voltage signal of varying amplitude and frequency based on the engine vibration or noise level. The amplitude and frequency are dependant upon the level of knock that the knock sensor detects. The ECM receives the knock sensor signal through 2 isolated signal circuits.

If the ECM has determined that knock is present, it will retard the ignition timing to attempt to reduce the knock. The ECM is capable of controlling spark retard on an individual cylinder basis. The ECM will always try to work back to a zero compensation level, or no spark retard. knock sensor diagnostics are calibrated to detect faults with the knock sensor circuitry inside the ECM, the knock sensor wiring, or the knock sensor voltage output. Some diagnostics are also calibrated to detect constant noise from an outside influence such as a loose/damaged component or excessive mechanical engine noise.

Knock Sensor Replacement
Knock Sensor Replacement Callout Component Name Preliminary Procedures Disconnect battery negative cable. Refer to Battery Nega ...

Heated Oxygen Sensor Replacement - Sensor 1
Heated Oxygen Sensor Replacement - Sensor 1 Callout Component Name Warning: In order to avoid being burned, do not service the ...

Other materials:

Menu System
Controls The Push/MENU/TUNE knob, Push/ MENU/TUNE button, and / BACK button are used to navigate the menu system. Push/MENU/TUNE Knob: Turn to: Enter the menu system. Highlight a menu option. Select a value. Push/MENU/TUNE Button: Press to: Select or activate the highlighted men ...

Air Inlet Valve Actuator Replacement (LHD)
Air Inlet Valve Actuator Replacement Callout Component Name Preliminary Procedures Remove the instrument panel compartment. Refer to Instrument Panel Lower Compartment Replacement. Reposition any wiring or hoses to gain a ...

Exhaust Camshaft Installation
Note: Mind the markings on the camshaft bearing caps. Camshaft bearing caps should be installed in their original position. Lubricate camshaft and camshaft bearing caps with engine oil. Install the exhaust camshaft (3). Install the 5 camshaft bearing caps̴ ...

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