Read 2008_natef_steer_suspens_brake_tasks.xls text version

2008 Automobile NATEF Task List 4 - SUSPENSION AND STEERING

For every task in Suspension and Steering, the following safety requirement must be strictly enforced: Comply with personal and environmental safety practices associated with clothing; eye protection; hand tools; power equipment; proper ventilation; and the handling, storage, and disposal of chemicals/materials in accordance with local, state, and federal safety and environmental regulations.

4 A. General Suspension and Steering Systems Diagnosis Complete work order to include customer information, vehicle identifying information, customer concern, A1 related service history, cause, and correction. A2 Identify and interpret suspension and steering system concerns; determine necessary action. Research applicable vehicle and service information, such as suspension and steering system operation, A3 vehicle service history, service precautions, and technical service bulletins. A4 Locate and interpret vehicle and major component identification numbers. 4 B. Steering Systems Diagnosis and Repair B1 Disable and enable supplemental restraint system (SRS). B2 Remove and replace steering wheel; center/time supplemental restraint system (SRS) coil (clock spring). Diagnose steering column noises, looseness, and binding concerns (including tilt mechanisms); determine B3 necessary action. Diagnose power steering gear (non-rack and pinion) binding, uneven turning effort, looseness, hard steering, B4 and noise, concerns; determine necessary action. Diagnose power steering gear (rack and pinion) binding, uneven turning effort, looseness, hard steering, and B5 noise concerns; determine necessary action. Inspect steering shaft universal-joint(s), flexible coupling(s), collapsible column, lock cylinder mechanism, B6 and steering wheel; perform necessary action. B7 Adjust non-rack and pinion worm bearing preload and sector lash. B8 Remove and replace rack and pinion steering gear; inspect mounting bushings and brackets. B9 Inspect and replace rack and pinion steering gear inner tie rod ends (sockets) and bellows boots. B10 Determine proper power steering fluid type; inspect fluid level and condition. B11 Flush, fill, and bleed power steering system. B12 Diagnose power steering fluid leakage; determine necessary action. B13 Remove, inspect, replace, and adjust power steering pump belt. B14 Remove and reinstall power steering pump. B15 Remove and reinstall press fit power steering pump pulley; check pulley and belt alignment. B16 Inspect and replace power steering hoses and fittings. Inspect and replace pitman arm, relay (centerlink/intermediate) rod, idler arm and mountings, and steering B17 linkage damper. B18 Inspect, replace, and adjust tie rod ends (sockets), tie rod sleeves, and clamps. Test and diagnose components of electronically controlled steering systems using a scan tool; determine B19 necessary action. B20 Inspect and test electric power assist steering. B21 Identify hybrid vehicle power steering system electrical circuits, service and safety precautions.

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4 C. Suspension Systems Diagnosis and Repair Diagnose short and long arm suspension system noises, body sway, and uneven ride height concerns; C1 P-1 determine necessary action. Diagnose strut suspension system noises, body sway, and uneven ride height concerns; determine necessary C2 P-1 action. P-2 C3 Remove, inspect, and install upper and lower control arms, bushings, shafts, and rebound bumpers. C4 Remove, inspect and install strut rods and bushings. P-2 C5 Remove, inspect, and install upper and/or lower ball joints. P-1 C6 Remove, inspect, and install steering knuckle assemblies. P-2 C7 Remove, inspect, and install short and long arm suspension system coil springs and spring insulators. P-3 C8 Remove, inspect, install, and adjust suspension system torsion bars; inspect mounts. P-3 C9 Remove, inspect, and install stabilizer bar bushings, brackets, and links. P-2 Remove, inspect, and install strut cartridge or assembly, strut coil spring, insulators (silencers), and upper C10 P-1 strut bearing mount. Remove, inspect, and install leaf springs, leaf spring insulators (silencers), shackles, brackets, bushings, and C11 P-3 mounts. 4 D. Related Suspension and Steering Service D1 Inspect, remove, and replace shock absorbers. P-1 D2 Remove, inspect, and service or replace front and rear wheel bearings. P-1 Test and diagnose components of electronically controlled suspension systems using a scan tool; determine D3 P-3 necessary action. Diagnose, inspect, adjust, repair or replace components of electronically controlled steering systems D4 P-3 (including sensors, switches, and actuators); initialize system as required. P-3 D5 Describe the function of the idle speed compensation switch. D6 Lubricate suspension and steering systems. P-2 4 E. Wheel Alignment Diagnosis, Adjustment, and Repair Diagnose vehicle wander, drift, pull, hard steering, bump steer, memory steer, torque steer, and steering return E1 P-1 concerns; determine necessary action. P-1 E2 Perform prealignment inspection and measure vehicle ride height; perform necessary action. Prepare vehicle for wheel alignment on the alignment machine; perform four wheel alignment by checking E3 P-1 and adjusting front and rear wheel caster, camber; and toe as required; center steering wheel. P-2 E4 Check toe-out-on-turns (turning radius); determine necessary action. E5 Check SAI (steering axis inclination) and included angle; determine necessary action. P-2 E6 Check rear wheel thrust angle; determine necessary action. P-1 E7 Check for front wheel setback; determine necessary action. P-2 E8 Check front and/or rear cradle (subframe) alignment; determine necessary action. P-3 4 F. Wheel and Tire Diagnosis and Repair F1 Inspect tire condition; identify tire wear patterns; check and adjust air pressure; determine necessary action. P-1 F2 Diagnose wheel/tire vibration, shimmy, and noise; determine necessary action. P-2 F3 Rotate tires according to manufacturer's recommendations. P-1 F4 Measure wheel, tire, axle flange, and hub runout; determine necessary action. P-2 F5 Diagnose tire pull problems; determine necessary action. P-2 F6 Dismount, inspect, and remount tire on wheel; balance wheel and tire assembly (static and dynamic). P-1 F7 Dismount, inspect, and remount tire on wheel equipped with tire pressure monitoring system sensor. P-2 F8 Reinstall wheel; torque lug nuts. P-1 F9 Inspect tire and wheel assembly for air loss; perform necessary action. P-1 F10 Repair tire using internal patch. P-1 F11 Inspect, diagnose, and calibrate tire pressure monitoring system. P-2

5 - BRAKES

For every task in Brakes, the following safety requirement must be strictly enforced: Comply with personal and environmental safety practices associated with clothing; eye protection; hand tools; power equipment; proper ventilation; and the handling, storage, and disposal of chemicals/materials in accordance with local, state, and federal safety and environmental regulations

5 A. General Brake Systems Diagnosis Complete work order to include customer information, vehicle identifying information, customer concern, A1 related service history, cause, and correction. A2 Identify and interpret brake system concern; determine necessary action. Research applicable vehicle and service information, such as brake system operation, vehicle service history, A3 service precautions, and technical service bulletins. A4 Locate and interpret vehicle and major component identification numbers. 5 B. Hydraulic System Diagnosis and Repair B1 Diagnose pressure concerns in the brake system using hydraulic principles (Pascal's Law). B2 Measure brake pedal height, travel, and free play (as applicable); determine necessary action. B3 Check master cylinder for internal/external leaks and proper operation; determine necessary action. B4 Remove, bench bleed, and reinstall master cylinder. Diagnose poor stopping, pulling, or dragging concerns caused by malfunctions in the hydraulic system; B5 determine necessary action. Inspect brake lines, flexible hoses, and fittings for leaks, dents, kinks, rust, cracks, bulging or wear; tighten B6 loose fittings and supports; determine necessary action. B7 Replace brake lines, hoses, fittings, and supports. B8 Fabricate brake lines using proper material and flaring procedures (double flare and ISO types). B9 Select, handle, store, and fill brake fluids to proper level. Inspect, test, and/or replace metering (hold-off), proportioning (balance), pressure differential, and B10 combination valves. B11 Inspect, test, and/or replace components of brake warning light system. B12 Bleed and/or flush brake system. B13 Test brake fluid for contamination. 5 C. Drum Brake Diagnosis and Repair Diagnose poor stopping, noise, vibration, pulling, grabbing, dragging or pedal pulsation concerns; determine C1 necessary action. C2 Remove, clean, inspect, and measure brake drums; determine necessary action. C3 Refinish brake drum; measure final drum diameter. Remove, clean, and inspect brake shoes, springs, pins, clips, levers, adjusters/self-adjusters, other related C4 brake hardware, and backing support plates; lubricate and reassemble. C5 Inspect and install wheel cylinders. C6 Pre-adjust brake shoes and parking brake; install brake drums or drum/hub assemblies and wheel bearings. C7 Install wheel, torque lug nuts, and make final checks and adjustments.

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5 D. Disc Brake Diagnosis and Repair D1 Diagnose poor stopping, noise, vibration, pulling, grabbing, dragging or pulsation; determine necessary action D2 Remove caliper assembly; inspect for leaks and damage to caliper housing; determine necessary action. D3 Clean/inspect caliper mounting and slides/pins for operation, wear, and damage; determine necessary action D4 Remove, inspect and replace pads and retaining hardware; determine necessary action. Disassemble and clean caliper assembly; inspect parts for wear, rust, scoring, and damage; replace seal, boot, D5 and damaged or worn parts. D6 Reassemble, lubricate, and reinstall caliper, pads, and related hardware; seat pads, and inspect for leaks. D7 Clean, inspect, measure rotor thickness, lateral runout, and thickness variation; determine necessary action D8 Remove and reinstall rotor. D9 Refinish rotor on vehicle; measure final rotor thickness. D10 Refinish rotor off vehicle; measure final rotor thickness. D11 Retract caliper piston on an integrated parking brake system. D12 Install wheel, torque lug nuts, and make final checks and adjustments. D13 Check brake pad wear indicator system operation; determine necessary action. 5 E. Power Assist Units Diagnosis and Repair E1 Test pedal free travel; check power assist operation. E2 Check vacuum supply to vacuum-type power booster. E3 Inspect vacuum powerbooster for leaks; inspect check valve for proper operation; determine necessary action E4 Inspect-test hydraulically assisted power brake system for leaks and operation; determine necessary action E5 Measure and adjust master cylinder pushrod length. 5 F. Miscellaneous (Wheel Bearings, Parking Brakes, Electrical, Etc.) Diagnosis and Repair F1 Diagnose wheel bearing noises, wheel shimmy, and vibration concerns; determine necessary action. F2 Remove, clean, inspect, repack, and install wheel bearings and replace seals; install hub and adjust bearings. Check parking brake cables and components for wear, binding, and corrosion; clean, lubricate, adjust or F3 replace as needed. F4 Check parking brake and indicator light system operation; determine necessary action. F5 Check operation of brake stop light system; determine necessary action. F6 Replace wheel bearing and race. F7 Inspect and replace wheel studs. F8 Remove and reinstall sealed wheel bearing assembly. 5 G. Electronic Brake, Traction and Stability Control Systems Diagnosis and Repair G1 Identify and inspect electronic brake control system components; determine necessary action. Diagnose poor stopping, wheel lock-up, abnormal pedal feel, unwanted application,and noise concerns G2 associated with the electronic brake control system; determine necessary action. Diagnose electronic brake control system electronic control(s) and components by retrieving diagnostic G3 trouble codes, and/or using recommended test equipment; determine necessary action. G4 Depressurize high-pressure components of the electronic brake control system. G5 Bleed the electronic brake control system hydraulic circuits. G6 Remove and install electronic brake control system electrical/electronic and hydraulic components. Test, diagnose and service electronic brake control system speed sensors (digital and analog), toothed ring G7 (tone wheel), and circuits using a graphing multimeter (GMM)/digital storage oscilloscope (DSO) (includes output signal, resistance, shorts to voltage/ground, and frequency data). Diagnose electronic brake control system braking concerns caused by vehicle modifications (tire size, curb G8 height, final drive ratio, etc.). G9 Identify traction control/vehicle stability control system components. G10 Describe the operation of a regenerative braking system.

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