Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
With Scan Tool
2019 Chevrolet Trax LS, FWDSECTION With Scan Tool
WARNING: This page is about a different car, the 2019 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition - On / Vehicle - In Service Mode
- Select:Module Diagnostics
- Select:Engine Control Module
- Select:Configuration/Reset Functions
- Select:Reset Functions
- Select:Throttle Body Idle Air Flow Compensation Reset
- Follow the instructions on the scan tool.
- Verify the scan tool parameter:Throttle Body Idle Air Flow Compensation = 0%
- If greater than 0
Repeat step 1
- Go to next step: If 0
- If greater than 0
- Engine - Idling - At normal operating temperature
- Verify the scan tool parameter:Engine Speed = -100 to +200 RPM of the Desired Idle Speed
- {Test failed 1 time (s) }If not in the specified range
- Engine idling. - For greater than 3 min
- Ignition/Vehicle - Off - For greater than 1 min
- Engine idling. - For greater than 3 min
- Repeat step 9
- {Test failed 2 time (s) }If not in the specified range
- Perform the following action:Road test the vehicle.
- Vehicle Speed - Greater than 70 km (44 mi)
- Decelerate - For 2 s
- Repeat step 10.2 - 3 times
- Engine idling. - For greater than 3 min
- Repeat step 9
- {Test failed 3 time (s) }If not in the specified range
Refer to:Diagnostic System Check - Vehicle
- Go to next step: If in the specified range
- All OK.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • 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.