NATEF Task Area A6 - Grafton School District · NATEF Task Area A6 Electrical & Electronic Systems A. General Electrical System Diagnosis Locate shorts, grounds, opens, and resistance

NATEF Task Area A6 Electrical & Electronic Systems

• A. General Electrical System Diagnosis

• B. Battery Diagnosis & Service

• C. Starting System Diagnosis & Repair

• D. Charging System Diagnosis & Repair

• E. Lighting System Diagnosis & Repair

• F. Gauges, Warning Devices, Instrument Cluster D & R

• G. Horn, Wiper and Washer Diagnosis & Repair

• H. Accessory Diagnosis & Repair

NATEF Task Area A6 Electrical & Electronic Systems A. General Electrical System Diagnosis

Complete work order to include customer information, vehicle identifying information, verify customer concern, related service history, cause, & correction.

A6.A.1


Identify & interpret electrical/electronic system concern; determine necessary action.

A6.A.2


Research applicable vehicle and service information, such as brake system operation, vehicle service history, service precautions, and technical service bulletins.

A6.A.3

http://www.rsandas.com/

Amazing Automotive Electrical Site


Locate and interpret vehicle and major component identification numbers (VIN, vehicle certification labels, calibration decals)

A6.A.4


Diagnose electrical/electronic integrity of series, parallel, and seriesparallel circuits using principles of electricity (Ohm's law).

A6.A.5


Use wiring diagrams during diagnosis of electrical circuit problems A6.A.6


Demonstrate proper use of digital multimeter (DMM) during diagnosis of electrical circuit problems.

A6.A.7

Open Circuit Voltage

Voltage Available

Voltage Drop

DC Amps In Series

DC Amps Inductive

Resistance Ω

Capacitance

Continuity

Diode Tests

Relay Tests


Check electrical circuits with a test light; determine necessary action. A6.A.8

12volt

Continuity

Logic Probe


Check electrical/electronic circuit waveforms; compare to waveform library knowngood images, interpret readings and determine needed repairs.

A6.A.9


Check electrical circuits using fused jumper wires; determine necessary action. A6.A.10


Locate shorts, grounds, opens, and resistance problems in electrical/electronic circuits; determine necessary action.

A6.A.11

A short circuit is simply a low resistance connection between the two conductors supplying electrical power to any circuit. This results in excessive current flow in the power source through the 'short,' and may even cause the power source to be destroyed. If a fuse is in the supply circuit, it will do its job and blow out, opening the circuit and

stopping the current flow.


Measure and diagnose the cause(s) of excessive (keyoff battery drain) parasitic draw; determine necessary action.

A6.A.12

PARASITIC DRAIN Check for excessive battery drain or parasitic loads using an ammeter. Make sure all electrical loads are off in the car, doors closed, and the key is out of the ignition switch . Disconnect one of the battery cables from the battery, placing an ammeter in series between the battery post and cable clamp. The current draw reading should be less than 35 milliamps. A reading higher than this (or manufacturer specifications) would indicate excessive battery drain. Something is "on", allowing current to flow running down the battery. Vehicles today typically will draw less than .020 amps (20 milliamps) of current to maintain electronic memories and circuits.


Inspect & test fusible links, circuit breakers, & fuses; determine necessary action. A6.A.13


Inspect and test switches, connectors, relays, solenoid solid state devices, and wires of electrical/electronic circuits; perform necessary action.

A6.A.14

If the control coil is energized, Then the motor feed contacts close.


Remove and replace terminal end from connector; replace connectors and terminal ends.

A6.A.15


Repair wiring harness (including CAN/BUS systems & twisted pairs). A6.A.16


Perform (rosin core) solder repair of electrical wiring. (including heat shrink) A6.A.17

Heat Sink

Heat Shrink

Rosin Core Solder


Identify location of hybrid vehicle high voltage circuit disconnect (service plug) location and safety procedures.

A6.A.18

NATEF Task Area A6 Electrical & Electronic Systems B. Battery Diagnosis & Service

Perform battery stateofcharge test; determine needed service A6.B.1


Perform battery capacity test (or conductance test); confirm proper battery capacity for vehicle application; determine necessary action.

A6.B.2

2 CCA per Cubic Inch

2 CCA per 16 cc’s


Maintain or restore electronic memory functions A6.B.3


Inspect, clean, fill, and replace battery A6.B.4


Perform slow/fast battery charge. A6.B.5


Inspect & clean battery cables, connectors, clamps, and holddownsrepair/replace as needed

A6.B.6

Voltage Drop of Negative Cable End


Start a vehicle using jumper cables and a battery or auxiliary power supply to mfgr. procedures

A6.B.7


Identify high voltage circuits of electric or hybrid vehicles and related safety precautions.

A6.B.8


Identify electronic modules, security systems and/or radios that require re initialization or code entry following battery disconnect.

A6.B.9


Identify hybrid vehicle auxiliary (12v) battery service, repair and test procedures. A6.B.10

NATEF Task Area A6 Electrical & Electronic Systems C. Starting System Diagnosis & Repair

Perform starter current draw tests; determine necessary action. A6.C.1


Perform starter circuit voltage drop tests; determine necessary action A6.C.2


Inspect and test starter relays and solenoids; determine necessary action. A6.C.3


Remove and install starter in a vehicle. A6.C.4


Inspect and test switches, connectors, and wires of starter control circuits A6.C.5


Differentiate between electrical and engine mechanical problems that cause a slowcrank or a nocrank condition.

A6.C.6

NATEF Task Area A6 Electrical & Electronic Systems D. Charging System Diagnosis & Repair

Perform charging system output test; determine necessary action A6.D.1


Diagnose charging system for the cause of undercharge, nocharge & overcharge conditions

A6.D.2


Inspect and adjust generator (alternator) drive belts, pulleys and tensioners; check pulley and belt alignment.

A6.D.3


Remove, inspect, and install generator (alternator). A6.D.4


Perform charging circuit voltage drop tests; determine necessary action A6.D.5

NATEF Task Area A6 Electrical & Electronic Systems E. Lighting Systems Diagnosis & Repair

Diagnose the cause of brighter than normal, intermittent, dim, or no light operation; determine necessary action

A6.E.1


Inspect, replace, and aim headlights and bulbs A6.E.2


Inspect and diagnose incorrect turn signal, brake, park or hazard light operation; perform necessary action.

A6.E.3


Identify system voltage and safety precautions associated with high intensity discharge headlights.

A6.E.4

NATEF Task Area A6 Electrical & Electronic Systems F. Gauges, Warning Devices, Driver Information Systems, Instrument Clusters Inspect and test gauges and gauge sending units for cause of intermittent, high, low, or no gauge readings; determine necessary action.

A6.F.1

NATEF Task Area A6 Electrical & Electronic Systems F. Gauges, Warning Devices, Driver Information Systems, Instrument Clusters Inspect and test connectors, wires, and printed circuit boards of gauge circuits; determine necessary action.

A6.F.2

NATEF Task Area A6 Electrical & Electronic Systems F. Gauges, Warning Devices, Driver Information Systems, Instrument Clusters Diagnose the cause of incorrect operation of warning devices and other driver information systems; determine necessary action.

A6.F.3

NATEF Task Area A6 Electrical & Electronic Systems F. Gauges, Warning Devices, Driver Information Systems, Instrument Clusters Inspect and test sensors, connectors, and wires of electronic (digital) instrument circuits; determine necessary action.

A6.F.4

NATEF Task Area A6 Electrical & Electronic Systems G. Horn, Wiper and Washer Diagnosis & Repair

Diagnose incorrect horn operation; perform necessary action. A6.G.1


Diagnose incorrect wiper operation; diagnose wiper speed control and park problems; perform necessary action.

A6.G.2


Diagnose incorrect windshield washer operation; perform necessary action A6.G.3

NATEF Task Area A6 Electrical & Electronic Systems H. Accessory Diagnosis & Repair

Diagnose incorrect operation of motordriven accessory circuits; determine necessary action

A6.H.1


Diagnose incorrect heated glass, mirror or seat operation; determine necessary action.

A6.H.2


Diagnose incorrect electric lock operation; determine necessary action. A6.H.3


Diagnose incorrect operation of cruise control systems; repair as needed. A6.H.4


Diagnose supplemental restraint system (SRS) concerns; determine necessary action. (Note: follow manufacturer's safety procedures to prevent accidental deployment)

A6.H.5


Disarm and enable the airbag system for vehicle service. A6.H.6


Diagnose radio static and weak, intermittent, or no radio reception; determine action.

A6.H.7


Remove & reinstall door panel. A6.H.8


Diagnose body electronic system circuits using a scan tool; determine necessary action.

A6.H.9


Check for module communication (including CAN/BUS systems) errors using a scan tool.

A6.H.10


Diagnose the cause of false, intermittent, or no operation of antitheft systems. A6.H.11

Documents

NATEF Task Area A6 - Grafton School District · NATEF Task Area A6 Electrical & Electronic Systems A. General Electrical System Diagnosis Locate shorts, grounds, opens, and resistance