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.
Power & Ground Circuits
For testing of Engine Control Module (ECM) power and ground circuits, see appropriate J - PIN VOLTAGE CHARTS article. Refer to ECM LOCATION (TABLE 1) for identifying ECM mounting locations.
| Model | Location |
|---|---|
| Camry | Behind Glove Box |
| Celica | Below Passenger's Side Of Instrument Panel, Underneath Carpet Near Center Console |
| Corolla | Behind Stereo On Instrument Panel, Just In Front Of Center Console |
| RAV4 | Behind Instrument Panel, Near Front Of Center Console |
| Tacoma & Tercel | Behind Glove Box |
| T100 | Behind Passenger's Side Kick Panel |
| 4Runner | Behind Glove Box |
Use the Manual With the Right Hardware
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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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