Circuit Description

PCM directly controls the ground for the linear EGR valve when certain conditions have been met. PCM contains a diode feedback circuit which dissipates energy when the valve is cycled off. When PCM grounds the valve, a diagnostic feedback signal can determine is valve had actually moved. This DTC has been defined to monitor the feedback signal. This diagnostic will determine if the position feedback signal properly falls within the correct range under different valve operating conditions.

If this DTC is present, EGR will be disabled for the entire ignition cycle. The malfunction history record will aid in diagnosis. The EGR valve may operate at any engine coolant temperature regardless of loop mode.