#wiring
8 posts in Car Diagnostics blog about "wiring" — OBD-II diagnostics, DTC codes, repair. ← All posts
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The rear wiper and tailgate electrics
A tailgate houses several systems, and all of them run through one loom. Why they fail together.
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Aftermarket accessories: why the car started misbehaving after the dash cam went in
Dash cams, alarms, seat heaters, and audio are the most common cause of electrical faults that then get hunted for weeks inside factory systems. How they cause damage and how to avoid it.
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Washing the engine bay: why codes appear afterwards and the car will not start
A clean engine bay looks good and occasionally costs a lot. What actually suffers from pressurised water, why the problems arrive days later, and how to wash without consequences.
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Towbars and electronics: why cheap wiring produces faults across the whole car
The mechanical part of fitting a towbar is simple. The electrical part is not: a modern car has to "know" a trailer is attached, or the stability systems operate on the wrong rules.
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Burning smell in a car: eight sources and how to tell them apart by scent
Burning wiring, a slipping clutch, oil on the manifold, and overheated pads all smell different. Diagnosis by the character of the smell, when it appears, and what diagnostics shows alongside.
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The LIN bus: half the car that never appears at the diagnostic port
Window motors, mirrors, the rain sensor, the alternator, the climate system — all of it lives on a second network, cheaper and slower than CAN. The OBD port cannot see it at all, which is why some faults "cannot be diagnosed".
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P0201–P0206: injector circuit — when the wire is at fault, not the injector
These codes name a specific cylinder, which is why they get read as "the injector died". In fact the module is complaining about an electrical circuit, and the injector is only one of three elements in it.
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U0100: lost communication with the engine module — and why the car still drives
The most common network code. Somebody on the bus stopped hearing the engine control module — and that almost never means the module itself has died. Causes from a voltage sag to a broken bus wire.