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.
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HOMESERVICE MANUALSTOYOTA19884RUNNER SR5, 3.0 V, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMCOMPUTER CONTROL SYSTEMDIAGNOSIS & TESTINGRETRIEVING TROUBLE CODES
1988 Toyota 4Runner SR5, 3.0 V, Automatic
Retrieving Trouble Codes
1988 Toyota 4Runner SR5, 3.0 V, AutomaticSECTION Retrieving Trouble Codes
- Ensure battery voltage is greater than 11 volts and throttle valve is fully closed. Place transmission or transaxle in Neutral and turn off all accessory switches.
- To enter diagnostic mode, turn ignition on. DO NOT start engine. Install jumper wire between terminals of engine check connector. See Fig 1.
- Count number of flashes from "CHECK ENGINE" light. If system is operating properly (with no codes), "CHECK ENGINE" light will blink continuously and evenly.
- If more than one code is stored, a 2.5 second pause will occur prior to the flashing of the second code. Once all codes have been displayed, a 4.5 second pause will occur and code(s) will repeat.
- On turbo models, count number of flashes to indicate trouble code. A 2.5 second pause will occur between trouble codes only. See Figure. Once all codes have been displayed, a 4.5 second pause will occur and code(s) will repeat.
- On all models, trouble codes are given from smallest value in order to largest value. After code(s) are retrieved, remove jumper wire to exit diagnostic mode.
- Compare trouble code to that listed to locate probable cause. See appropriate TROUBLE CODE IDENTIFICATION and TROUBLE CODES & PROBABLE CAUSE tables.
CAUTION:
Ensure trouble codes are cleared after performing repair. Road test and recheck that trouble code does not exist.
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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.