P1634 is set when excessive current or "0"A is detected in heater relay control circuit for more than 1.0 sec. at heater relay operating condition. This code is due to 1)open or 2)short to battery or ground in heater relay control circuit or 3)component problem.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy |
•
Voltage monitoring |
•
PTC heater relay #1 control circuit
•
Heater relay component | ||
Enable Conditions |
•
IG KEY "ON" (monitoring only performed at relay operating condition) | |||
Threshold Value |
•
Short to battery | |||
Diagnostic Time |
•
1.0 sec. | |||
Fail Safe | Fuel Cut | NO | ||
EGR Off | NO | |||
Fuel Limit | NO | |||
Check Lamp | NO | |||
