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.
Self-Diagnostic System: Notes
The self-diagnostic system is capable of detecting ECCS malfunctions and storing a related trouble code. Since even intermittent codes are stored, all codes are available for interpretation unless codes have been cleared or ignition has been cycled 50 times since the malfunction last occurred.
Self diagnostic system will be operated in one of 5 modes. Modes are manually changed using screwdriver through access port on ECU (toggling selector slide switch from "OFF" to "ON" position on Pathfinder and Pickup). With screwdriver turned fully clockwise (selector slide switch in "ON" position), inspection lights will begin to flash. When desired mode has been entered, turn screwdriver fully counterclockwise (selector slide switch to "OFF" position). In different modes, Red and Green LED's perform different functions.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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