4 Wheel Alignment Steering and Suspension Diagnosis

Transcription

1 JOB SHEET A4E1: Diagnose Tire Wear Problems Start Date: Name: End Date: Make: Model: Year: VIN: Mileage: Learning Objective/NATEF Task Diagnose vehicle wander, drift, pull, hard steering, bump steer, memory steer, torque steer, steering return, tire wear patterns, wheel/tire vibration, shimmy, and noise problems. o NATEF task A4/E1, P1. ICS 156, ICS 167 Tools and Materials Classroom vehicle(s) and/or components OEM service manual Safety glasses Procedure 1. You must understand and observe all State/Federal Regulations and personal safety procedures when carrying out the following task(s). Wear safety glasses for this entire procedure. 2. Review Diagnosing Steering and Suspension and Wheel Alignment Concerns in Lesson 2 of Unit 14 of the A4 course. 3. In the OEM service manual for your classroom vehicle, locate the procedure for diagnosing vehicle wander, drift, pull, hard steering, bump steer, memory steer, torque steer, steering return, tire wear patterns, wheel/tire vibration, shimmy, and noise problems. Submit this procedure to your instructor or mentor for approval and then answer the following questions. Your instructor must stamp or initial the box to the right before you can proceed with this job sheet. 1

2 1. Road test vehicle with your instructor or mentor using a variety of driving conditions from slow speed driving and cornering to normal cruising speed driving on a straight, level road surface. Check for the following abnormal steering conditions and note all abnormal behavior of the steering system. After the road test, answer the following questions: Always have your instructor or mentor accompany you when conducting a road test. Do not attempt to drive the vehicle unless instructed to do so. Conduct the road test in an area with little or no traffic. Never exceed the legal speed limit during the road test. Always wear safety belts. You should record all observations made during the road test. a. Vertical chassis oscillations: Did the vehicle's behavior seem normal? If it was not b. Chassis lateral waddle: Did the vehicle's behavior seem normal? If it was not c. Steering pull to right: Did the vehicle's behavior seem normal? If it was not d. Steering pull to left: Did the vehicle's behavior seem normal? If it was not 2

3 e. Steering effort: Did the vehicle's behavior seem normal? If it was not f. Tire squeal while cornering: Did the vehicle's behavior seem normal? If it was not g. Bump steer: Did the vehicle's behavior seem normal? If it was not normal, identify the problem. h. Torque steer: Did the vehicle's behavior seem normal? If it was not i. Memory steer: Did the vehicle's behavior seem normal? If it was not j. Steering wheel return: Did the vehicle's behavior seem normal? If it was not 3

4 k. Steering wheel freeplay: Did the vehicle's behavior seem normal? If it was not 2. Return the vehicle to the shop and inspect suspension and steering to determine the cause of all abnormal conditions. List the necessary repairs and/or adjustments to correct all abnormal conditions that occurred during the road test. Task Summary Now that you have completed this NATEF task, can you think of anything (tools, information, knowledge etc.) that would have made this task easier? 4

5 List a customer complaint together with the cause determined by this diagnostic/ inspection task that might appear on a work order, and then list the NATEF task correction you would use to resolve the complaint. Use this rubric to rate the completion of job sheet 1 = Demonstrates exposure/observation of the competency 2 = Applies the competency but only mastered a few essential attributes of the competency 3 = Capable of the competency but needs further practice 4 = Performs the competency satisfactorily 5 = Masters the competency Instructor Mentor 5