P0031 is set when open or short to ground in lambda sensor control circuit is detected for more than 5 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 | 1. λ sensor heater circuit. 2. λ sensor component. | ||
Enable Conditions |
•
Engine running | |||
Threshold Value |
•
Short to GND in lambda sensor heater control circuit.
•
Open in lambda sensor heater control circuit. | |||
Diagnostic Time |
•
5 sec. | |||
Fail Safe | Fuel cut | NO |
•
- | |
EGR Off | NO | |||
Fuel Limit | NO | |||
Check Lamp | OFF | |||
