|
Step
|
Action
|
Values
|
Yes
|
No
|
DEFINITION: The Power Steering System Test procedure will perform the following functions:
|
•
|
Test the operation of the hydraulic power steering system.
|
|
•
|
Test the operation of the power steering pump and the steering gear.
|
|
•
|
Identify restrictions in the system.
|
|
1
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Inspect the power steering fluid for the following indications of contamination:
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•
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Debris in fluid - plastic or dirt
|
Is the fluid free of contamination?
|
-
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Go to
Step 3
|
Go to
Step 2
|
2
|
Flush the power steering system. Refer to
Power Steering System Flushing
.
Did you complete the operation?
|
-
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Go to
Step 3
|
-
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3
|
|
Note
|
|
In order to accurately diagnose the system, the malfunction must be present during the test procedure.
|
Attempt to duplicate the condition.
Is the condition still present?
|
-
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Go to
Step 4
|
System OK
|
4
|
|
1.
|
Turn the ignition switch to the OFF position.
|
|
2.
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Place a drain pan under the vehicle in order to catch any power steering fluid.
|
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3.
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Disconnect the power steering pressure pipe/hose from the power steering pump or the steering gear as necessary.
|
|
4.
|
Install the
CH-44721
analyzer
|
Did you complete the installation?
|
-
|
Go to
Step 5
|
-
|
5
|
|
1.
|
Fully open the
CH-44721
analyzer valve.
|
|
3.
|
Warning
|
|
Do not hold the steering wheel in the full turn position longer than 5 seconds, as damage to the steering pump may result.
|
|
|
|
|
|
Turn the steering wheel and BRIEFLY hold the steering wheel against the steering stop in order to release any trapped air from the system.
|
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4.
|
Inspect and ensure that all of the power steering pipe/hose connections are not leaking.
|
|
5.
|
With the steering wheel OFF of the steering stop, observe the pressure reading.
|
Is the pressure reading greater than the specified value?
|
1379 kPa
(200 psi)
|
Go to
Step 6
|
Go to
Step 7
|
6
|
|
Note
|
|
A restriction may be present in the power steering system. Turn OFF the engine IMMEDIATELY.
|
Locate and repair the restriction.
Did you complete the repair?
|
-
|
Go to
Step 15
|
-
|
7
|
|
1.
|
Allow the engine to run until the engine reaches full operating temperature.
|
|
2.
|
Record the pressure reading and flow reading.
|
|
3.
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Partially close the
CH-44721
analyzer valve until the system pressure reaches the specified value, then record the FLOW reading.
|
|
4.
|
Subtract the second flow reading from the first flow reading.
|
Is the flow DECREASE greater than 3.8 L (1 gal) per minute?
|
4827 kPa
(700 psi)
|
Go to
Step 11
|
Go to
Step 8
|
8
|
|
Note
|
|
Do not leave the valve closed for more than 5 seconds, or internal pump damage could accrue.
|
Fully close then open the
CH-44721
analyzer valve 3 times. Record all of the high pressure readings. Refer to
Power Steering Pump Specifications
for the power steering system pressure relief specifications.
Are the 3 high pressure readings within specifications?
|
-
|
Go to
Step 9
|
Go to
Step 13
|
9
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Are the three high pressure readings within 245 kPa (50 psi) of each other?
|
-
|
Go to
Step 10
|
Go to
Step 13
|
10
|
|
1.
|
Increase the engine speed to approximately 1,500 RPM.
|
Is the actual flow reading within specifications?
|
-
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Go to
Step 11
|
Go to
Step 13
|
11
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Is the difference between the actual flow reading and the maximum flow specification more than 3.8 L (1 gal) per minute?
|
-
|
Go to
Step 13
|
Go to
Step 12
|
12
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Turn the steering wheel from steering stop to steering stop and record the FLOW readings at each stop.
Is the flow LOWER than 3.8 L (1 gal) per minute?
|
-
|
Go to
Step 15
|
Go to
Step 14
|
13
|
Replace the power steering pump. Refer to
Power Steering Pump Replacement (LAU)
Power Steering Pump Replacement (LF1)
.
Did you complete the replacement?
|
-
|
Go to
Step 15
|
-
|
14
|
The steering gear is leaking across the piston or bypassing the valve circuit. Replace the steering gear. Refer to
Steering Gear Replacement
.
Did you complete the replacement?
|
-
|
Go to
Step 15
|
-
|
15
|
Test the power steering system for the original condition.
Does the original condition still exist?
|
-
|
Go to
Step 5
|
Go to
Step 16
|
16
|
|
1.
|
Disconnect and remove the
CH-44721
analyzer from the vehicle.
|
|
2.
|
Connect the vehicle power steering pipes/hoses.
|
Did you complete the operation?
|
-
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System OK
|
-
|
