DTC P1518: IMRC Shutter Valve Stuck Open: Condition

PCM monitors intake manifold runner control (IMRC) circuit voltage. DTC is set when PCM terminal No. 3 voltage is less than 1.6 volt for 3.2 seconds when IMRC valve changes from open to closed position. Possible causes are:

• Short circuit.
• Connector or terminal malfunction.
• IMRC malfunction.
• PCM malfunction.