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HOMESERVICE MANUALSCHEVROLET2025EQUINOX ACTIV, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS AND FUEL - 1.5L (LSD) - SPECIFICATIONSSPECIFICATIONSOSCILLOSCOPE WAVEFORM LIBRARYDESCRIPTION
2025 Chevrolet Equinox ACTIV, 4WD

Oscilloscope Waveform Library: Description

2025 Chevrolet Equinox ACTIV, 4WDSECTION Description

The figures in the tables below are reference waveforms collected from known-good vehicles and faulted vehicles. Each figure is accompanied by a description. 

Starting - Diesel Engines

Normal Abnormal
GM5700729Courtesy of GENERAL MOTORS COMPANY
  1. 8 Cylinder Engine
  2. 4 Cylinder Engine
  3. 6 Cylinder Engine
GM5700733Courtesy of GENERAL MOTORS COMPANY
  1. 3 Cylinder Engine - Low Compression
  2. Low Compression - The waveform repeats every 3 compression strokes, indicating a current and repeatable compression fault.
  3. 8 Cylinder Engine - High Starter Load
  4. Exhaust Valve = Stuck Closed - The waveform repeats every 8 compression strokes, indicating a current and repeatable compression fault. When one cylinder displays double the relative compression, this is an indication of a stuck closed exhaust valve on the companion cylinder.
NOTE:
  • An engine with little to no compression variance between cylinders will have waveform valleys that are even.
  • If the engine compression is equally low across all cylinders, the oscilloscope pattern will appear good.
  • The total amplitude (range from highest to lowest point of the waveform) is NOT an indicator of good compression.
Operating Conditions: 
  1. Fuel System - Disabled
  2. { Automatic Transmission } Apply & Hold - Brake Pedal

    { Manual Transmission } Apply & Hold - Clutch Pedal

  3. Engine - Cranking - For 5 - 10 s
Starting - Gasoline Engines

Normal Abnormal
GM5700730Courtesy of GENERAL MOTORS COMPANY
  1. 8 Cylinder Engine
  2. 6 Cylinder Engine
  3. 4 Cylinder Engine
  4. 3 Cylinder Engine
GM5700733Courtesy of GENERAL MOTORS COMPANY
  1. 3 Cylinder Engine - Low Compression
  2. Low Compression - The waveform repeats every 3 compression strokes, indicating a current and repeatable compression fault.
  3. 8 Cylinder Engine - High Starter Load
  4. Exhaust Valve = Stuck Closed - The waveform repeats every 8 compression strokes, indicating a current and repeatable compression fault. When one cylinder displays double the relative compression, this is an indication of a stuck closed exhaust valve on the companion cylinder.
NOTE:
  • An engine with little to no compression variance between cylinders will have waveform valleys that are even.
  • If the engine compression is equally low across all cylinders, the oscilloscope pattern will appear good.
  • The total amplitude (range from highest to lowest point of the waveform) is NOT an indicator of good compression.
Operating Conditions: 
  1. Fully Applied - Accelerator Pedal @ Wide Open Throttle
  2. { Automatic Transmission } Apply & Hold - Brake Pedal

    { Manual Transmission } Apply & Hold - Clutch Pedal

  3. Engine - Cranking - For 5 - 10 s
RENDER: 1.0x

NO RELATED

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  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.