Circuit Description

PCM monitors EGR valve pintle position input to ensure that valve responds properly to commands from PCM. The EGR (linear) valve is controlled by using an ignition positive driver and ground circuit within the PCM. The driver has the ability to detect an electrical malfunction in the ignition voltage or ground circuit, then signal the PCM to set the DTC.

Conditions for setting this DTC are: system voltage at 9-18 volts, engine speed greater than 80 RPM, PCM driver transitions from on to off or from off to on, there is a short to ground, open in circuit or short to battery voltage detected on control circuit and conditions are present for at least 30 seconds.