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.
Impulse Counter Readout
Enter self-diagnostics. See ENTERING SELF-DIAGNOSTICS. Start engine, and run at idle. Ensure drive selector is in Park or Neutral. Press START button on impulse counter for 2-4 seconds maximum. (Pressing push button longer than 2-4 seconds will erase code in memory). Impulse counter will now indicate how many code(s) are stored in memory by digital readout display. Record readout displays. Press START button on impulse counter for 2-4 seconds maximum. If no codes are stored in memory, "1" will display. If codes are stored, first code number will be displayed. Record this number, and press START button again for next code number to display. Repeat sequence until No. 1 displays. Run engine at 900 RPM for 5 seconds minimum, and press START button for 2-4 seconds with engine still at 900 RPM. This sequence will check EGR system code. If no code is displayed, EGR system is okay.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.