DTC P1521: Variable Resonance Induction System No. 1 (VRIS1), Open Or Short Circuit: Condition

DTC is set when Powertrain Control Module (PCM) detects open or short circuit in VRIS No. 1 solenoid valve system with ignition switch on. Possible causes are:

• VRIS solenoid No. 1 malfunction.
• Open or short of Red/Black wire between terminal "A" on VRIS solenoid valve No. 1 and main relay.
• Open or short of Light Green wire between terminal "B" on VRIS solenoid valve No. 1 and terminal No. 1AA on Powertrain Control Module (PCM). See Figure .