| NATEF
Tasks |
Description |
Priority
designation |
| A |
General
Engine Diagnosis |
|
| VIII.A.1 |
Identify
and interpret engine performance concern; determine necessary action. |
P-1 |
| VIII.A.2 |
Research
applicable vehicle and service information, such as engine management
system operation, vehicle service history, service precautions,
and technical service bulletins. |
P-1 |
| VIII.A.3 |
Locate
and interpret vehicle and major component identification numbers
(VIN, vehicle certification labels, and calibration decals). |
P-1 |
| VIII.A.4 |
Inspect
engine assembly for fuel, oil, coolant, and other leaks; determine
necessary action. |
P-2 |
| VIII.A.5 |
Diagnose
abnormal engine noise or vibration concerns; determine necessary
action. |
P-2 |
| VIII.A.6 |
Diagnose
abnormal exhaust color, odor, and sound; determine necessary action.
|
P-2 |
| VIII.A.7 |
Perform
engine absolute (vacuum/boost) manifold pressure tests; determine
necessary action. |
P-1 |
| VIII.A.8 |
Perform
cylinder power balance test; determine necessary action. |
P-1 |
| VIII.A.9 |
Perform
cylinder compression test; determine necessary action. |
P-1 |
| VIII.A.10 |
Perform
cylinder leakage test; determine necessary action. |
P-1 |
| VIII.A.11 |
Diagnose
engine mechanical, electrical, electronic, fuel, and ignition concerns
with an oscilloscope and/or engine diagnostic equipment; determine
necessary action. |
P-1 |
| VIII.A.12 |
Prepare
4 or 5 gas analyzer; inspect and prepare vehicle for test, and obtain
exhaust readings; interpret readings, and determine necessary action. |
P-1 |
| VIII.A.13 |
Verify
engine operating temperature; determine necessary action. |
P-1 |
| VIII.A.14 |
Perform
cooling system pressure tests; check coolant condition; inspect
and test radiator, pressure cap, coolant recovery tank, and hoses;
perform necessary action. |
P-1 |
| VIII.A.15 |
Verify
correct camshaft timing. |
P-2 |
| B |
Computerized
Engine Controls Diagnosis and Repair |
|
| VIII.B.1 |
Retrieve
and record stored OBD I diagnostic trouble codes; clear codes. |
P-2 |
| VIII.B.2 |
Retrieve
and record stored OBD II diagnostic trouble codes; clear codes.
|
P-1 |
| VIII.B.3 |
Diagnose
the causes of emissions or drivability concerns resulting from malfunctions
in the computerized engine control system with stored diagnostic
trouble codes. |
P-1 |
| VIII.B.4 |
Diagnose
emissions or drivability concerns resulting from malfunctions in
the computerized engine control system with no stored diagnostic
trouble codes; determine necessary action. |
P-1 |
| VIII.B.5 |
Check
for module communication errors using a scan tool. |
P-2 |
| VIII.B.6 |
Inspect
and test computerized engine control system sensors, power train
control module (PCM), actuators, and circuits using a graphing multimeter
(GMM)/digital storage oscilloscope (DSO); perform necessary action.
|
P-1 |
| VIII.B.7 |
Obtain
and interpret scan tool data. |
P-1 |
| VIII.B.8 |
Access
and use service information to perform step-by-step diagnosis. |
P-1 |
| VIII.B.9 |
Diagnose
drivability and emissions problems resulting from malfunctions of
interrelated systems (cruise control, security alarms, suspension
controls, traction controls, A/C, automatic transmissions, non-OEM-installed
accessories, and similar systems); determine necessary action. |
P-3 |
| C |
Ignition
System Diagnosis and Repair |
|
| VIII.C.1 |
Diagnose
ignition system related problems such as no-starting, hard starting,
engine misfire, poor drivability, spark knock, power loss, poor
mileage, and emissions concerns on vehicles with electronic ignition
(distributor-less) systems; determine necessary action. |
P-1 |
| VIII.C.2 |
Diagnose
ignition system related problems such as no-starting, hard starting,
engine misfire, poor drivability, spark knock, power loss, poor
mileage, and emissions concerns on vehicles with distributor ignition
(DI) systems; determine necessary action. |
P-1 |
| VIII.C.3 |
Inspect
and test ignition primary circuit wiring and solid state components;
perform necessary action. |
P-2 |
| VIII.C.4 |
Inspect,
test and service distributor. |
P-3 |
| VIII.C.5 |
Inspect
and test ignition secondary circuit wiring and components; perform
necessary action. |
P-2 |
| VIII.C.6 |
Inspect
and test ignition coil(s); perform necessary action. |
P-1 |
| VIII.C.7 |
Check
and adjust ignition system timing and timing advance/retard (where
applicable). |
P-3 |
| VIII.C.8 |
Inspect
and test ignition system pick-up sensor or triggering devices; perform
necessary action. |
P-1 |
| D |
Fuel,
Air Induction, and Exhaust Systems Diagnosis and Repair |
|
| VIII.D.1 |
Diagnose
hot or cold no-starting, hard starting, poor drivability, incorrect
idle speed, poor idle, flooding, hesitation, surging, engine misfire,
power loss, stalling, poor mileage, dieseling, and emissions problems
on vehicles with carburetor-type fuel systems; determine necessary
action. |
P-3 |
| VIII.D.2 |
Diagnose
hot or cold no-starting, hard starting, poor drivability, incorrect
idle speed, poor idle, flooding, hesitation, surging, engine misfire,
power loss, stalling, poor mileage, dieseling, and emissions problems
on vehicles with injection-type fuel systems; determine necessary
action. |
P-1 |
| VIII.D.3 |
Check
fuel for contaminants and quality; determine necessary action. |
P-3 |
| VIII.D.4 |
Inspect
and test mechanical and electrical fuel pumps and pump control systems
for pressure, regulation and volume; perform necessary action. |
P-1 |
| VIII.D.5 |
Replace
fuel filters. |
P-1 |
| VIII.D.6 |
Inspect
and test cold enrichment system and components; perform necessary
action. |
P-3 |
| VIII.D.7 |
Inspect
throttle body, air induction system, intake manifold and gaskets
for vacuum leaks and/or unmetered air. |
P-2 |
| VIII.D.8 |
Inspect
and test fuel injectors. |
P-2 |
| VIII.D.9 |
Check
idle speed and fuel mixture. |
P-2 |
| VIII.D.10 |
Adjust
idle speed and fuel mixture. |
P-3 |
| VIII.D.11 |
Inspect
the integrity of the exhaust manifold, exhaust pipes, muffler(s),
catalytic converter(s), resonator(s), tail pipe(s), and heat shield(s);
perform necessary action. |
P-2 |
| VIII.D.12 |
Perform
exhaust system back-pressure test; determine necessary action. |
P-1 |
| VIII.D.13 |
Test
the operation of turbocharger/supercharger systems; determine necessary
action. |
P-3 |
| E |
Emissions
Control Systems Diagnosis and Repair |
|
| |
1.
Positive Crankcase Ventilation |
|
| VIII.E.1.1 |
Diagnosis
oil leaks, emissions, and drivability problems resulting from malfunctions
in the positive crankcase ventilation (PCV) system; determine necessary
action. |
P-2 |
| VIII.E.1.2 |
Inspect,
test, and service positive crankcase ventilation (PCV) filter/breather
cap, valve, tubes, orifices, and hoses; perform necessary action.
|
P-2 |
| |
2.
Exhaust Gas Recirculation |
|
| VIII.E.2.1 |
Diagnose
emissions and drivability problems caused by malfunctions in the
exhaust gas recirculation (EGR) system; determine necessary action.
|
P-1 |
| VIII.E.2.2 |
Inspect,
test, service, and replace components of the EGR system, including
EGR tubing, exhaust passages, vacuum/pressure controls, filters
and hoses; perform necessary action. |
P-2 |
| VIII.E.2.3 |
Inspect
and test electrical/electronic sensors, controls, and wiring of
exhaust gas recirculation (EGR) systems; perform necessary action. |
P-2 |
| |
3.
Exhaust Gas Treatment |
|
| VIII.E.3.1 |
Diagnose
emissions and drivability problems resulting from malfunctions in
the secondary air injection and catalytic converter systems; determine
necessary action. |
P-2 |
| VIII.E.3.2 |
Inspect
and test mechanical components of secondary air injection systems;
perform necessary action. |
P-3 |
| VIII.E.3.3 |
Inspect
and test electrical/electronically-operated components and circuits
of air injection systems; perform necessary action. |
P-3 |
| VIII.E.3.4 |
Inspect
and test catalytic converter performance. |
P-1 |
| |
4.
Intake Air Temperature Controls |
|
| VIII.E.4.1 |
Diagnose
emissions and drivability problems resulting from malfunctions in
the intake air temperature control system; determine necessary action.
|
P-3 |
| VIII.E.4.2 |
Inspect
and test components of intake air temperature control system; perform
necessary action. |
P-3 |
| |
5.
Early Fuel Evaporation (Intake Manifold Temperature) Controls |
|
| VIII.E.5.1 |
Diagnose
emissions and drivability problems resulting from malfunctions in
the early fuel evaporation control system; determine necessary action.
|
P-3 |
| VIII.E.5.2 |
Inspect
and test components of early fuel evaporation control system; perform
necessary action. |
P-3 |
| |
6.
Evaporative Emissions Controls |
|
| VIII.E.6.1 |
Diagnose
emissions and drivability problems resulting from malfunctions in
the evaporative emissions control system; determine necessary action.
|
P-1 |
| VIII.E.6.2 |
Inspect
and test components and hoses of evaporative emissions control system;
perform necessary action. |
P-2 |
| VIII.E.6.3 |
Interpret
evaporative emission related diagnostic trouble codes (DTCs); determine
necessary action. |
P-1 |
| F |
Engine
Related Service |
|
| VIII.F.1 |
Adjust
valves on engines with mechanical or hydraulic lifters. |
P-1 |
| VIII.F.2 |
Remove
and replace timing belt; verify correct camshaft timing. |
P-1 |
| VIII.F.3 |
Remove
and replace thermostat. |
P-2 |
| VIII.F.4 |
Inspect
and test mechanical/electrical fans, fan clutch, fan shroud/ducting,
air dams, and fan control devices; perform necessary action. |
P-1 |
