Diagnosis And Testing
WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The Multi Displacement System has the following detectable issues:
- Solenoid circuit
- Fail to deactivate a cylinder(s)
- Fail to reactivate a cylinder(s)
- Low oil pressure
| CONDITION | POSSIBLE CAUSES | CORRECTION |
|---|---|---|
| MDS does not activate | 1. Low oil pressure | 1. Check for proper oil pressure |
| 2. Bad oil temp sensor | 2. Replace oil temp sensor | |
| - | 3. Malfunctioning MDS Solenoid | 3. Replace Solenoid |
| - | 4. Malfunctioning MDS Tappet | 4. Replace Tappet |
| MDS Does Not Deactivate | 1. Low oil pressure | 1. Check for proper oil pressure |
| 2. Bad oil temp sensor | 2. Replace oil temp sensor | |
| - | 3. Malfunctioning MDS Solenoid | 3. Replace Solenoid |
| - | 4. Malfunctioning MDS Tappet | 4. Replace Tappet |