DTC U0284 00: Lin Communication System: Communication Error Between Active Air Shutter And Pcm: Notes

DTC U0284 00 DETECTION CONDITIONS AND POSSIBLE CAUSES (SKYACTIV-G 2.0, SKYACTIV-G 2.5)

DTC U0284:00	LIN communication system: Communication error between active air shutter and PCM
DETECTION CONDITION	PCM detects a communication error between the PCM and active air shutter. Diagnostic support note  This is a continuous monitor (other). The check engine light does not illuminate. FREEZE FRAME DATA (Mode 2) is not available. Snapshot data is available. DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Stops active air shutter control.
POSSIBLE CAUSE	LIN communication line malfunction between active air shutter and PCM Active air shutter connector or terminals malfunction Short to ground or open circuit in active air shutter power supply circuit Short to ground in wiring harness between ENGINE3 15 A fuse and active air shutter terminal A ENGINE3 15 A fuse malfunction Open circuit in wiring harness between main relay terminal D and active air shutter terminal A Open circuit in wiring harness between active air shutter terminal D and body ground PCM connector or terminals malfunction Short to ground in wiring harness between active air shutter terminal C and PCM terminal 2Z Short to power supply in wiring harness between active air shutter terminal C and PCM terminal 2Z Open circuit in wiring harness between active air shutter terminal C and PCM terminal 2Z Active air shutter malfunction PCM malfunction
Courtesy of MAZDA MOTORS CORP.