Diagnostic Case Studies
Evidence-driven case studies with full workflows — complaint, initial evidence, working differential, tests performed, confirmed root cause, repair, verification, and lessons. Every case is a separately reviewed publication object; private workshop and customer data is never exposed.
- Educational / DemonstrationAudi 2.0 TFSI — P0087 Low Rail Pressure Diagnostic PathEducational case: Audi 2.0 TFSI (EA888 family), direct-injection petrol. Synthetic/demo scenario constructed for methodology training.Long crank when hot, occasional stumble on acceleration, MIL on with P0087 stored.
- Educational / DemonstrationShared 5V Reference — Multiple Sensor Faults from One Shorted SensorEducational case: generic direct-injection engine, shared 5V reference across MAP, IAT, FRP and tank-pressure sensors. Synthetic/demo scenario for electrical methodology training.MIL on, rough idle, multiple sensor codes with no single obvious cause.
- Educational / DemonstrationCAN Branch Short — Multiple Modules Offline from One Harness FaultEducational case: generic vehicle with drive-train CAN bus. Synthetic/demo scenario for network-fault methodology training.Multiple warning lamps (ABS, airbag, transmission), instrument cluster errors, vehicle drives but with limited function.
- Educational / DemonstrationSingle-Cylinder Misfire — Ignition & Fuel Ruled Out, Compression Fault ConfirmedEducational case: 4-cylinder naturally-aspirated petrol. Synthetic/demo scenario for misfire methodology training.Rough idle, MIL flashing under load, P0303 stored (cylinder 3 misfire).
- Educational / DemonstrationTurbo Underboost — Requested vs Actual Low, Charge-Air Leak FoundEducational case: 2.0 turbocharged petrol (TFSI-style). Synthetic/demo scenario for boost-fault methodology training.Low power under motorway acceleration, occasional limp mode, MIL on with P0299.