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.
2003 Chevrolet Tracker 2D Utility, RWD, AutomaticFACTORY OEM SERVICE PROCEDURE
Test Description
The following list gives a description for appropriate step numbers in diagnostic procedure.
- 1 - The DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS, prompts technician to complete some basic checks and store "Freeze Frame" data on scan tool if applicable. This creates an electronic copy of data taken when fault occurred. Information is then stored in scan tool for later reference.
- 3 - This step checks for an EGR valve that is leaking, stuck open, or turned on at idle. A normal engine operating temperature is specified as 176°F (80°C) or more.
- 4 - This step checks operation of EGR valve. EGR duty cycle output control is disabled by PCM when any DTCs are stored and when engine temperature is less than 176°F (80°C).
- 8 - This step checks for a physically stuck EGR valve or plugged EGR passages.
- 9 - This step checks Ignition Positive Voltage supply to EGR coils.
- 10 - This step determines whether an electrical fault is cause of EGR valve staying open. An EGR Valve Control circuit that becomes shorted or open when EGR valve is open, can cause valve to remain open at all times.
- 12 - This step checks for an EGR Valve Control circuit that is shorted to ground. If circuit wiring is okay, a faulty PCM with an internally shorted circuit can cause EGR valve to be open.
Factory Service Tools
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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.