System Check

Start engine. Check Variable Resonance Induction System (VRIS) shutter valve actuator rod positions. For 626, see VACUUM DIAGRAMS article. For Millenia, see Figure . On all models, rods should not be pulled. If shutter valve actuator rods are not pulled, go to step 4 . If shutter valve actuator rods are pulled, go to next step.
Turn ignition off. Connect New Generation Star (49 T088 0A0) scan tool to Data Link Connector (DLC). DLC is located under left side of instrument panel, right of steering column. Check for Diagnostic Trouble Codes (DTCs). See appropriate SELF-DIAGNOSTICS - INTRODUCTION article. If any DTCs are present, repair as necessary. If no DTCs are present, go to next step.
Start engine and run at idle. Using scan tool, select SIMULATION TEST and turn both VRIS solenoid valves on. Listen for solenoid clicking noise. If both solenoids click, check shutter valve actuators. If solenoids do not click, check solenoid valves.
Start engine and operate at idle. Check operation of shutter valve actuators No. 1 and 2 at specified engine speed. See VRIS RPM SPECIFICATIONS (MILLENIA 2.5L & 626 2.5L) table. If actuators do not operate as specified, check for DTCs. See appropriate SELF-DIAGNOSTICS - INTRODUCTION article. Repair as necessary. If no DTCs are present, check VRIS components and Throttle Position (TP) sensor.

VRIS RPM SPECIFICATIONS (MILLENIA 2.5L & 626 2.5L)