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 to ground in wiring between IMRC harness connector terminal No. 1 (Black/Red wire) and PCM harness connector terminal No. 42 (Black/Yellow wire) or between IMRC harness connector terminal No. 5 (Black/Blue wire) and PCM harness connector terminal No. 3 (Red wire).
• Connector or terminal malfunction.
• IMRC malfunction.
• PCM malfunction.