Geely EC715 2009, Workshop Manual

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7.2.7 Diagnostic Information and Procedures
7.2.7.1 Diagnosis Description
Refer to 7.2.2.1 Description and Operation get familiar with the system functions and operation before start system diagnostics, so
that it will help to determine the the correct diagnostic steps, more importantly, it will also help to determine whether the customer
described situation is normal.
7.2.7.2 Visual Inspection
Prior to maintenance, confirm the fault, carry out road test. Consider and visual inspect the following systems:
– Tire and Wheel
a. Check whether the tire pressure is appropriate, whether the wear is even.
b. Whether the tires lose roundness.
c. Whether the tires are unbalanced.
d. Whether the wheel bearings loose or noisy.
– Suspension System
a. Front suspension, rear suspension, whether the connecting rod is loose or damaged.
– Steering System
a. Whether the mechanical steering column and steering gear assembly connection is loose or worn.
b. Whether the power steering pump assembly, steering gear and the pipe are leaking.
c. Whether the power steering fluid surface is correct. Refer to 7.2.8.2 Power Steering Fluid Level Inspection .
7.2.7.3 Fault Symptom Table
During diagnostic process. Refer to the following table. It can help to determine the cause and location of faults. Numbers are in
descending order to indicate the possible causes of faults, check each component. If necessary, repair or Replace these
components.
Symptoms Suspected Parts Measures / Refer to
Steering Effort
Hard
1. Tires (Tire pressure inadequate or tread damage)
Add air or replace the tires. Refer to 4.4 Wheels and
Tires .
2. Power Steering Fluid Level (Low)
Add steering fluid. Refer to 7.2.8.2 Power Steering
Fluid Level Inspection .
3. Drive Belt (Loose)
Adjust or Replace the drive belt. Refer to 7.2.8.1 Drive
Belt Inspection .
4. Front Wheel Positioning (Incorrect)
Adjust the front wheel positioning. Refer to
4.4.3.1 Wheel Alignment .
5. Power Steering Tie Rod Ball Joint (wear)
Replace the Power Steering Tie Rod Ball Joint. Refer
to
7.2.8.11 Steering Bar and Ball Joint Replacement .
6. Lower Control Arm Ball Joint (Wear)
Replace the lower control arm Ball joint. Refer to
4.2.7.7 Lower Control Arm Ball Joint Replacement .
7. Front Shock Absorber Upper Bearing Assembly
(Wear)
Replace the Front shock absorber Upper bearing
assembly. Refer to
4.2.7.4 Front Shock Absorber
Components and Spring Replacement .
7-14 Hydraulic Power Steering System Steering System
EC718/EC718RV EC715/EC715RV 10/2009