P0646 is set when '0A' is detected in A/C relay control circuit for more than 1 sec.. This code is due to open or short to ground in A/C relay control circuit or internal open in relay component.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy |
•
Voltage monitoring | 1. A/C relay circuit 2. A/C relay component | ||
Enable Conditions |
•
IG key ON | |||
Threshold value |
•
Short to ground in A/C relay control circuit. | |||
Diagnosis Time |
•
2.0 sec. | |||
Fail Safe | Fuel cut | NO |
•
- | |
EGR Off | NO | |||
Fuel Limit | NO | |||
Check Lamp | OFF | |||
