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P3497-MDS RATIONALITY BANK 2 For a complete wiring diagram Refer to Section 8W. 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 INSUFFICIENT OIL PRESSURE ACTING ON THE LIFTER LOCKING PINS OIL PASSAGES RESTRICTED LIFTER MDS SOLENOID 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. NOTE: Diagnose any Deactivation or Oil Pressure DTCs before continuing with this test. 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) 2. MDS SOLENOID 4 Turn the ignition off. Remove the Intake Manifold per Service Information. Turn the ignition on. With the scan tool actuate the MDS Solenoid 4. Can you feel and hear the Solenoid Actuating? Yes >> Go To 3 No >> Remove the Solenoid and check for any debris that may be blocking the oil passages to the Solenoid. If the passages are clogged, clean the passages and replace the MDS Solenoid 4. If the passages are Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 972 ENGINE ELECTRICAL DIAGNOSTICS LX |