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.
1988 Toyota CressidaFACTORY OEM SERVICE PROCEDURE
Retrieving Trouble Codes
- Ensure battery voltage is greater than 11 volts and throttle valve is fully closed. Place transmission or transaxle in Neutral.
- To enter diagnostic mode, turn ignition on. DO NOT start engine. Simultaneously push and hold in "SELECT" key and "INPUT M" keys for at least 3 seconds. See Fig 1. The letters "DIAG" will appear on the screen.
- After a short pause, hold in "SET" key for at least 3 seconds. If system is normal, "ENG -OK" will appear on the screen. If malfunction exists, the trouble code number will appear on the screen. If more than one number exists, there will be a 3 second pause between each number.
- Once trouble code is noted, turn ignition off or push any button except "SET" so that the time appears on the screen. This will exit the diagnostic mode.
- Compare trouble code to that listed to locate probable cause. See appropriate TROUBLE CODE IDENTIFICATION and TROUBLE CODES & PROBABLE CAUSE tables.
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.