DTC P0646 A/C Clutch Relay Control Circuit Low: DTC Detecting Condition

DTC DETECTING CONDITION AND POSSIBLE CAUSES

Item	Detecting Condition	Possible Cause
DTC Strategy	Circuit continuity check, low	Poor connection short to ground in control circuit A/C relay ECM/PCM
Enable Conditions
Threshold Value	Short circuit to ground
Diagnostic Time	Continuous
MIL ON Condition	DTC only