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.
1990 Toyota Corolla Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Cold Start Injector Time Switch Test
- Unplug cold start injector time switch connector. For cold start injector time switch location, see the appropriate illustration in the THEORY/OPERATION article.
- Using ohmmeter, check resistance between terminals "STA" & "STJ" at appropriate temperature. Refer to the COLD START INJECTOR TIME SWITCH SPECIFICATIONS table. There should be continuity between terminal "STA" and ground. Replace switch if not within specification.
NOTE:
"STA" terminal is fed current from ignition switch during cranking. "STJ" goes to cold start injector.
COLD START INJECTOR TIME SWITCH SPECIFICATIONS
| Application | Ohms | Condition |
|---|---|---|
| All Engines | 20-40 | Below 86°F (30°C) |
| " | 40-60 | Above 104°F (40°C) |
| " | 20-80 | "STA" To Ground |
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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