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.
Test N - Dynamic Response Test
Code 77. This code appeared because the system failed to recognize a brief wide open throttle. Repeat KEY ON-ENGINE RUNNING (KOER) SELF-TEST . After Dynamic Response Code is received, perform a wide open throttle. If code 77 is still present, replace ECA and repeat QUICK TEST . If no code 77, Dynamic Response Test is passed. Repair any service codes received as required.
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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.