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.
1984 Toyota 4Runner BaseFACTORY OEM SERVICE PROCEDURE
Diagnostic Code Output
- After entering diagnostic mode, the "CHECK ENGINE" lamp should flash a code. If no trouble codes are stored in memory, the lamp should flash once every 3 seconds. This is the "system normal" code. See Figure.
- If trouble codes are stored in ECU memory, the "CHECK ENGINE" lamp will flash once every second. If code "6" is stored in memory, the lamp will flash 6 times in 6 seconds.
- Trouble codes will be displayed from lowest to highest numbered code. Output of the diagnostic codes will continue as long as the diagnostic mode is activated. A 3-second delay follows display of each code.
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.
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