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.
Component Testing: Computer
Raise and support vehicle. Remove glove box or console. DO NOT disconnect computer connector. Start engine. Using a voltmeter, check computer voltage as indicated in COMPUTER VOLTAGE SPECIFICATIONS table. See Fig 1. If voltage is not as specified, replace computer.
| Test Between | Vehicle Speed - MPH (km/h) | Volts | |||
|---|---|---|---|---|---|
| SOL (-) & Ground | |||||
| Cressida | 37 (60) | .12-.24 | |||
| Pickup, 4Runner & Supra | 31 (50) | .09-.23 | |||
| SOL (+) & SOL (-) | |||||
| Cressida, Pickup & 4Runner | (1) | 0-.05 | |||
| Supra | (1) | .32-.44 | |||
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NO RELATED
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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.