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.
1985 Toyota 4Runner Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Diagnostic Code Output
- To obtain an output of diagnostic codes, ensure battery voltage is above 11 volts, throttle valve is fully closed, transmission is in "P" or "NEUTRAL" positions, all accessory switches are in "OFF" position, and engine is at normal operating temperature.
- Turn ignition switch to "ON" position. DO NOT start engine. Using a sub-wire, short terminals T - E1 of "CHECK ENGINE" connector. See Figure.
- Read diagnostic code as indicated by number of flashes of "CHECK ENGINE" warning light. Diagnose codes by referring to the TCCS TROUBLE CODE IDENTIFICATION table.
- The "CHECK ENGINE" warning light will blink a number of times equal to malfunction code indication with a 2.5 second delay between each indication. The diagnostic code series will be repeated as long as "CHECK ENGINE" connector terminals T - E1 are shorted.NOTE: In event of a number of trouble codes, indication will begin from the smaller value and continue to the larger in order.
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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