DJA1: Linear Sensor Error - Pump A

System does not detect the pump A (DJA1) or pump B (DJB1) linear position sensor, or has an invalid position reading.

Verify that sensor is plugged in. Verify that sensor and AFCM are operational. Verify cable connections. Replace any malfunctioning component.

Replace magnet and holder on top side of air motor piston.

Verify that the sensor is threaded down completely.