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Home >> Fiat >> 2021 >> 500X Pop >> Repair and Diagnosis >> Engine Performance >> System >> 1.3L - DTCS P0607 To P1045 >> DTC Troubleshooting >> P0685-ASD/Main Control Circuit >> Possible Causes
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Possible Causes

POSSIBLE CAUSES
ASD RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
ASD RELAY CONTROL CIRCUIT SHORTED TO GROUND
ASD RELAY CONTROL CIRCUIT OPEN/HIGH RESISTANCE
ASD RELAY
POWER DISTRIBUTION CENTER (PDC)
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  .