A
General Diagnosis
12 scored · 24%- A.1Verify driver's complaint, perform visual inspection, and/or road test vehicle; determine needed action.
- A.2Research applicable vehicle and service information, such as: engine management system operation, vehicle service history, service precautions, technical service bulletins, and service campaigns/recalls.
- A.3Diagnose base engine mechanical problems; determine needed action.
- A.4Diagnose noise and/or vibration problems; determine needed action.
- A.5Diagnose the cause of unusual exhaust color, odor, and sound; determine needed action.
- A.6Perform engine manifold vacuum or pressure tests; determine needed action.
- A.7Perform cylinder power balance test; determine needed action.
- A.8Perform cylinder cranking, relative, and running compression tests; interpret test results; determine needed action.
- A.9Perform cylinder leakage/leak-down test; determine needed action.
- A.10Diagnose engine mechanical, electrical, electronic, fuel, and ignition problems with an oscilloscope, engine analyzer, and/or scan tool; determine needed action.
- A.11Verify valve adjustment on engines with mechanical or hydraulic lifters.
- A.12Verify camshaft timing; verify operation of camshaft timing components, including engines equipped with variable valve timing (VVT) and variable valve lift (VVL); determine needed action.
- A.13Diagnose emissions or driveability problems caused by oil-related issues such as: incorrect pressure, poor quality, incorrect level, or incorrect type used for the application.
- A.14Verify engine operating temperature; check coolant level and condition; perform cooling system pressure test; determine needed action.
- A.15Inspect and test mechanically/hydraulically/electronically operated fans, fan clutch, fan shroud/ducting, active grille air flow control systems, and fan control devices; determine needed action.
- A.16Read and interpret electrical schematic diagrams and symbols.
- A.17Test and diagnose emissions or driveability problems caused by battery condition, connections, or excessive key-off battery drain; determine needed action.
- A.18Test and diagnose engine performance problems resulting from starting system failures; determine needed action.
- A.19Perform starter current draw test; determine needed action.
- A.20Perform starter and charging circuit voltage drop tests; determine needed action.
- A.21Test and diagnose engine performance problems resulting from charging system failures; determine needed action.
- A.22Inspect, adjust, and replace alternator (generator) drive belts, pulleys, clutches, tensioners, and/or fans.
- A.23Inspect, test, and repair or replace components, connectors, and wires in the starter and charging control circuits.