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.
Computer Test
Raise vehicle and support on chassis stands. Remove glove box or console. DO NOT disconnect computer connector. Start engine. Using a voltmeter, check that there is no voltage between computer terminals SOL (+) and SOL (-) with engine idling. See Fig 1. Place transmission in gear and raise vehicle speed to test specification. See COMPUTER VOLTAGE SPECIFICATIONS . If voltage is not to specification, replace computer.
| Application | Vehicle Speed MPH (km/h) | Voltage | |
|---|---|---|---|
| Cressida | |||
| SOL (-)-to-Ground | 37 (60) | .12-.23 | |
| Supra, Pickup & 4Runner | |||
| SOL (-)-to-Ground | 31 (50) | .12-.24 | |
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.