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.
Analog Volt-Ohmmeter (VOM)
1) Turn engine off and allow it to cool. Turn all accessories off. Disconnect STI jumper from ground. Place shift lever in Park (A/T) or Neutral (M/T).
2) Using a jumper wire, connect self-test connector STI terminal to ground. See Figure and Figure . Using an analog VOM, connect positive (+) lead to self-test connector SML terminal. See Figure and Figure . Connect negative (-) lead to engine ground.
3) Turn ignition on. Test EEC input devices individually. See SWITCH MONITOR TEST SPECIFICATIONS . Ensure input device is deactivated after test. Leaving device on while testing another device may produce false results and cause misdiagnosis.
4) If input device fails test (reading on VOM is not as indicated), perform related CIRCUIT TEST. See SWITCH MONITOR TEST SPECIFICATIONS . If all input devices test okay and no code is stored in ECA memory, EEC system test is complete.
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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.