DTC P1520: IMRC Drive Circuit Malfunction: Condition

PCM monitors intake manifold runner control (IMRC) circuit voltage. DTC is set when PCM terminal No.42 voltage is less than 3 volts when IMRC valve is not operating. Possible causes are:

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