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Draw on sleeper light circuit means switch or relay stuck on. Alternator (B) affects charging, not draw. Sulfation (C) result, not cause. Ground strap (D) affects voltage, not continuous draw. ASE T6 stresses isolating parasitic draw by fuse pulling.

Normal parasitic draw is ~50 mA or less. 400 mA suggests a stuck relay feeding a circuit after key-off (blower, lights, ECM). Alternator brushes (C) affect charging, not draw. Starter solenoid (D) only energizes on start. ASE T6 stresses systematic isolation: pulling fuses until draw drops, then inspecting for stuck relays or modules.

If return flow is high across injectors and rail pressure lags, the pressure relief valve is stuck open, bleeding pressure to return. Worn nozzles (B) would not cause uniform high return. Turbo actuator (C) and EGR (D) impact air, not rail pressure. ASE T2 emphasizes performing return flow and relief valve tests when rail pressure cannot be maintained.

Low boost with excessive shaft play confirms turbo failure. Injector (B) causes smoke but boost would be normal. DPF (C) restricts exhaust, not intake boost. DEF (D) affects NOx, not smoke. ASE T2 stresses turbo inspection when smoke and low boost coincide.

Leaking injector causes rich mixture, trims negative, O₂ high. Exhaust leaks (B) cause lean, MAP (C) alters load, knock sensor (D) timing, not fuel. ASE T1 stresses linking O₂ data with trims to diagnose fuel system leaks.