- Vibration depends on the engine speed.
- Vibration may depend on the load of auxiliary units.
Diagnostic information
Engine vibration may be caused by auxiliary drive components. It is recommended to pay attention to the following - excessive refrigerant charge in the air conditioning system, sticking in the power steering system or filling the system with the wrong fluid, additional load on the generator. To help identify intermittent or false situations, change the loads on the auxiliary drive components.
Description of the test
The numbers below refer to the operations in the diagnostic table:
2. This test is performed to check for the presence of vibration during diagnostics. Other components of the vehicle, such as the exhaust system or transmission, can also cause a similar symptom.
3. This test helps determine if the vibration is coming from the drive belt or accessory drive components. Removing the drive belt and running the engine for a few seconds will help determine if the vibration is coming from the drive belt or not. Without the drive belt, the water pump will not operate and the engine may overheat. Diagnostic trouble codes (DTCs) may also be set if the engine is running without the drive belt.
4. The cause of vibration may be the drive belt. Removing the drive belt provides the best conditions for inspecting its condition.
6. Inspecting the fasteners will help eliminate the possibility of an improperly installed bolt, nut, gasket or washer.
8. This step should only be performed if the fan is belt driven. Inspect the engine cooling fan for bent, warped, loose or cracked blades. Inspect the fan clutch for smooth rotation. Inspect the fan shaft or mounting flange for bending.
9. Check the water pump drive shaft for bending. Also check the water pump bearings for smooth rotation and excessive play. Compare the water pump with a known good water pump.
10. Auxiliary unit drive brackets that are bent, cracked, or loosened can cause additional stress on the auxiliary unit drive, causing it to vibrate.
| Step | Operation | Values | Yes | No |
| 1 |
Have you reviewed the diagnostic information Symptoms - Engine Mechanical and performed the necessary inspections?
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-
|
Jump to operations 2
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Go to item Symptoms - Engine Mechanical
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| 2 |
Make sure that the vibration is caused by the engine.
Does the engine vibrate when running?
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-
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Jump to operations 3
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Go to Diagnostic Information
|
| 3 |
Does the vibration still continue when the engine is running?
|
-
|
Go to Start Diagnosis - Diagnose and Troubleshoot Vibration in Diagnose and Troubleshoot Vibration
|
Jump to operations 4
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| 4 |
Inspect the drive belt for wear, damage, dirt buildup and missing ribs.
Were any of these conditions detected?
|
-
|
Jump to operations 5
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Jump to operations 6
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| 5 |
Install a new drive belt. See. Section 1C1, Engine Mechanical - FAM II 2.4D.
Has the replacement been made?
|
-
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Jump to operations 11
|
-
|
| 6 |
Inspect for proper installation, looseness and/or missing fasteners.
Were any of these conditions detected?
|
-
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Jump to operations 7
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Jump to operations 8
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| 7 |
Replace incorrect and/or missing fasteners. Tighten loose fasteners. See "Technical characteristics of fastener tightening" in this section.
Have the fasteners been replaced and/or tightened?
|
-
|
Jump to operations 11
|
-
|
| 8 |
Check if the fan blade is damaged or if the fan clutch shaft is bent.
Has the problem been detected and corrected?
|
-
|
Jump to operations 11
|
Jump to operations 9
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| 9 |
Check if the water pump shaft is bent.
Has the problem been detected and corrected?
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-
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Jump to operations 11
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Jump to operations 10
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| 10 |
Inspect the accessory drive bracket for cracks or bends.
Has the problem been detected and corrected?
|
-
|
Jump to operations 11
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-
|
| 11 |
Is the vibration still present?
|
-
|
-
|
The system is normal
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