Possible Causes
| Possible Causes |
|---|
| (K451) MDS SOLENOID NO.1 CONTROL SHORT TO GROUND |
| (K451) MDS SOLENOID NO.1 CONTROL OPEN |
| (Z904) GROUND CIRCUIT OPEN |
| INSUFFICIENT OIL PRESSURE ACTING ON THE LIFTER LOCKING PINS |
| OIL PASSAGES RESTRICTED |
| LIFTER |
| MDS SOLENOID |
| PCM |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to *PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .