DTC P1487: EGR Boost Sensor Solenoid Valve Circuit Malfunction: Condition

WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.

DTC is set when Powertrain Control Module (PCM) detects input voltage from EGR boost sensor solenoid valve is out of range. Possible causes are:

EGR boost sensor solenoid valve malfunction.
Short or open circuit between EGR boost sensor solenoid valve and PCM.
Open circuit between main relay and EGR boost sensor solenoid valve .
PCM malfunction.