DTC P2251 is set when 'Voltage nernst' circuit / 'Current pump' circuit is short to battery. DTC "P2238" or "P2251" is retrieved together or P2238, P2239" and "P2251" is set by abnormal signal is detected at 'Current adjust' and 'Ground'.If ECM detects 'Voltage nernst' or 'Current pump' is faulty.DTC Detecting Condition
Item | Detecting Condition | Possible Cause | ||
DTC Strategy |
•
Voltage monitoring | 1. λ sensor circuit. 2. λ sensor component. | ||
Enable Conditions |
•
Engine Running (After lambda sensor is completely warmed up) | |||
Threshold Value |
•
'Voltage nernst' is short to battery.
•
'Current pump' voltage is short to battery. | |||
Diagnostic Time |
•
2 sec. | |||
Fail Safe | Fuel cut | NO |
•
- | |
EGR Off | NO | |||
Fuel Limit | NO | |||
Check Lamp | OFF | |||
