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ASE A9 stresses boost/fuel balance. Low boost with normal fuel leads to excessive smoke and low power, pointing to turbo failure. Glow plugs affect starting. Timing issues affect combustion, but not boost. Fuel filters would drop fuel pressure, not boost. ASE requires turbo inspection.

ASE A6 stresses indicator diagnosis. If alternator output is correct but the warning light stays on, the indicator circuit or sense wire is faulty. Batteries and starters don’t affect the light circuit. Headlight fuses are unrelated. ASE requires circuit continuity testing.

ASE A2 stresses gear-specific faults. Slipping in one gear means the band or clutch pack for that gear is worn or hydraulically weak. Engine oil pressure, ignition, or driveshaft problems would not cause gear-specific slipping. ASE requires line pressure testing and transmission teardown for confirmation.

ASE A2 stresses engine and transmission communication. Erratic shifting without transmission codes often results from incorrect load signals from the engine, such as faulty TPS or mass airflow sensor data. Transmission modules rely on these inputs to determine shift timing. Brake fluid, spark plugs, and power steering fluid are unrelated to shifting. ASE objectives emphasize checking engine data inputs before suspecting internal transmission faults.

ASE A6 covers parasitic draw testing. Even with correct charging, excessive current draw from accessories or modules when the car is off can drain the battery. Voltage regulators affect charging, not overnight discharge. Ignition coils and starters only draw power when operating. ASE requires measuring parasitic draw with an ammeter and isolating circuits by pulling fuses.