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

DTC DETECTING CONDITION

Item	Detecting Condition	Possible cause
DTC Strategy	Detects circuit short to low voltage	Poor connection Open or short to ground in A/C relay circuit Faulty A/C relay Faulty PCM
Enable Conditions	After 0.5 sec under conditions below No DTC exists Engine works 11V ≤ Battery voltage ≤ 16V
Threshold value	Open or short to ground
Diagnosis Time	Continuous (More than 5 seconds failure for every 10 seconds test)
MIL On Condition	DTC only (NO MIL ON)