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.