P0031 is set when open or short to ground in Lambda sensor control circuit is detected for more than 5.0 sec. at Lambda sensor heater control condition. This code is due to 1)open or short to ground in heater control circuit or 2)Lambda sensor heater internal short.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy |
•
Voltage monitoring |
•
Lamda sensor heater circuit
•
Lamda sensor component | ||
Enable Conditions |
•
Engine running | |||
Threshold Value |
•
Short to GND in Lamda sensor heater control circuit
•
Open in Lamda sensor heater control circuit | |||
Diagnostic Time |
•
5.0 sec. | |||
Fail Safe | Fuel cut | NO | ||
EGR Off | NO | |||
Fuel Limit | NO | |||
Check Lamp | NO | |||
