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Theory of Operation When all criteria has been met, power is supplied to each MDS Solenoid when the engine is making a transition • When Monitored: • Set Condition: Possible Causes (K452) MDS SOLENOID NO.4 CONTROL SHORT TO GROUND (K452) MDS SOLENOID NO.4 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 9 - ENGINE - Diagnostic Test 1. ACTIVE DTC Ignition on, engine not running. With a scan tool, read DTCs. Is the DTC active at this time? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 924 ENGINE ELECTRICAL DIAGNOSTICS LX |