ECU Fault Codes
Quick-reference cards for identifying the engine-control system that needs testing.
- Code descriptions
- Diagnostic videos
- Related parts when appropriate
Diagnostics & Electrical
YXZ Addicts Tech
Diagnostics & Electrical
Fault codes, sensor identification, electrical testing, wiring checks, and practical troubleshooting resources.
MCU Codes
Sport Shift MCU clutch, actuator, sensor, and control-system fault codes.
- Complete Sh_ code list
- Actuator and sensor faults
- Future diagnostic videos
Electrical Testing & Troubleshooting
General electrical diagnosis that is useful across multiple fault codes and systems.
- Battery and charging
- Grounds and connectors
- Wiring and signal checks
Approved resource
2024–2025 Charging System Conversion
A practical charging-system conversion explanation with a price-free parts-reference ending.
Approved resource
Starter / One-Way Clutch Explanation
A practical explanation of the starter and one-way clutch components, cross-filed for mechanical and electrical troubleshooting.
Approved resource preview
Diagnosing an Engine Misfire
A practical diagnostic walkthrough for tracking down an engine misfire, cross-filed for mechanical and electrical troubleshooting.
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ECU Code 12 — Crankshaft Position Signal
A diagnostic walkthrough for an abnormal crankshaft-position signal. Test the circuit before replacing parts; Code 12 does not automatically identify a failed starter.
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Tech Tip: YXZ1000R Intercooler Fan Relay Wiring Harness
An electrical Tech Tip covering the intercooler-fan relay wiring harness and related wiring.
View Weller Racing Part 10419