Air-heater Relay which is controled by ECM supplies and cut electrical power to Air-heater. ECM activates or deactivates Air-heater Relay based on inputted signal such as Engine coolant temperature signal.
P0542 is set when excessive current is detected in Aircon relay control circuit for more than 1 sec.. This code is due to short to battery in Aircon relay control circuit or internal short in relay component.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy |
•
Voltage monitoring |
•
Air-heater relay circuit
•
Air-heater component | ||
Enable Conditions |
•
IG KEY "ON" | |||
Threshold Value |
•
Short to battery | |||
Diagnostic Time |
•
1.0 sec. | |||
Fail Safe | Fuel cut | NO | ||
EGR Off | NO | |||
Fuel Limit | NO | |||
MIL | NO | |||
