Standard

ACR 104 - Mechanical and Electrical Systems

Course Description

Introduces various mechanical and electrical systems requiring repair of damages incurred through automobile collisions. Topics include: engine accessory systems, emission control systems, air conditioning systems, braking systems, steering column damage, engine removal and replacement sequence, lighting systems, engine wiring, power accessories systems, and restraint systems.

Competency Areas		Hours
Engine Accessory Systems		Class	1
Emission Control Systems		D. Lab	0
Air Conditioning Systems		P. Lab/O.B.I.	3
Braking Systems		Credit	2
Steering Column Damage
Engine Removal and Replacement Sequence
Lighting Systems
Engine Wiring
Power Accessories Systems
Restraint Systems
Prerequisite/Corequisite::	Program admission, ACR 100, ACR 101, ACR 102

Course Guide

Competency	After completing this section, the student will:	Hours
		Class	D.Lab	P.Lab/ O.B.I.
ENGINE ACCESSORY SYSTEMS		1	0	3
Tools and equipment	Handle and care for tools and small equipment safely and correctly.
Safety	Demonstrate shop safety.
Estimating	Determine repair costs using estimating, flat rate, collision, parts and manufacturers' manual.
Inspection, removal, and replacement	Raise a car on a hydraulic lift-- use proper shop manual.
	Inspect, remove and replace alternator.
	Inspect, remove and replace fan.
	Inspect, remove and replace fan clutch.
	Inspect, remove and replace water pump.
	Inspect, remove and replace pulley fan belt.
	Inspect, remove and replace fan belt.
	Inspect, remove and replace radiator and hose.
	Inspect, remove and replace starter.
	Inspect, remove and replace battery.
EMISSION CONTROL SYSTEMS		1	0	2
Inspection and testing	Select proper shop manual. Select appropriate tools.
Removal and replacement	Test, remove and replace charcoal canister and filter.
	Test, remove and replace PCV valve.
	Test, remove and replace EGR valve.
	Inspect, remove and replace catalytic converter.
	Test, remove and replace air pump.
	Inspect, remove and replace air filter.
	Inspect, remove and replace fuel tank.
	Inspect, remove and replace mufflers and resonators.
AIR CONDITIONING SYSTEMS		1	0	3
Safety	Practice safety precautions for eye care and handling refrigerants.
Tools	Select tools and proper shop manual.
Inspection, removal, and replacement	Inspect, remove and replace condenser.
	Inspect, remove and replace expansion valve.
	Inspect, remove and replace evaporator.
	Inspect, remove and replace compressor.
	Inspect, remove and replace receiver-drier.
Test and evaluation	Evaluate and charge according to manufacturer's specifications.
	Leak test air conditioning with an electronic detector.
BRAKING SYSTEMS		1	0	2
Safety	Safely operate floor jack or hydraulic hoist. Practice safety precautions.
Tools	Select tools and proper shop manual.
Inspection, removal, and replacement	Inspect, remove and replace drum brake rotor.
	Inspect, remove and replace drum brakes and shoes.
	Inspect, remove and replace disc brake pads.
	Inspect, remove and replace hoses and lines.
	Inspect, remove and replace master cylinder.
	Inspect, remove and replace wheel cylinder.
	Inspect, remove and replace brake boosters (manual and power).
Bleeding brakes	Bleed brake system. Replace brake fluid.
STEERING COLUMN DAMAGE		1	0	3
Types	Identify types of steering columns.
Inspection, removal, and replacement	Remove and replace steering wheel.
	Remove and replace hour button.
	Remove and replace cruise control.
	Remove and replace tilt and telescope column.
	Remove and replace windshield wipers.
	Remove and replace collapsing mesh and canister steering column.
	Remove and replace signal light switch.
ENGINE REMOVAL AND REPLACEMENT SEQUENCE		1	0	5
Tools and manuals	Select proper shop manual and tools.
Safety	Safely operate a floor jack and hydraulic lift.
Inspection, removal, and replacement	Inspect engine for cracks visually. Remove and replace engine.
LIGHTING SYSTEMS		1	0	3
Schematic and codes	Explain wire sizing, color coding schematics and protective devices.
	Trace the headlight circuit on a vehicle.
	Select the proper wiring diagram from the shop manual.
Inspection, removal, and replacement	Disassemble headlight.
	Remove and replace headlights.
	Remove and replace park lights.
	Remove and replace brake lights.
	Repair wiring assembly and plug.
	Replace license plate light.
	Test bulbs and locate fuse panel.
	Remove and replace dome, courtesy and dash light bulbs and hazard flashers.
	Remove and replace corner lights.
	Remove and replace side marker lights.
Testing	Test lighting. Remove and replace tail and signal lights.
ENGINE WIRING		1	0	3
Safety	Demonstrate engine electrical safety precautions.
Procedures	Disconnect and connect choke heater.
	Disconnect and connect starter motor.
	Disconnect and connect battery.
	Remove and replace wire connectors.
	Disconnect and connect distributor.
	Disconnect and connect alternator.
	Disconnect and connect ignition coil.
	Disconnect and connect oil pressure switch.
	Disconnect and connect water temperature sending unit.
	Disconnect and connect fuel cut-off valve solenoid.
POWER ACCESSORIES SYSTEMS		1	0	3
	Inspect and test power accessory systems and determine necessary action.
RESTRAINT SYSTEMS		1	0	3
	Demonstrate safety procedures when working with restraint systems.
	Determine what components should be replaced and take necessary action.

Suggested Resources

Books

Chudy, H. T. (1988). The complete guide to automotive refinishing (2nd ed.). Englewood Cliffs, NJ: Prentice Hall.

Deroche, A. G. (1988). Automotive collision estimating and repair. Englewood Cliffs, NJ: Prentice Hall.

Deroche, A. G. (1988). Automotive refinishing handbook. Englewood Cliffs, NJ: Prentice Hall.

Duenk, L. G., et al. (1984). Auto body repair. Encino, CA: Bennett & McKnight.

I-CAR. (1984). Unibody auto collision repair (Series 1-9). Des Plaines, IL: Author.

Author. (1988). Body and mechanic parts service and repair. San Diego: Mitchell.