The purpose of this diagnosis is to monitor the minimum coolant temperature that enables lambda closed loop control after start. Minimum coolant temperature to run lambda control must be reached before the threshold time pre-determined according to intake air temperature at start. If the lambda control is not active because of low engine coolant temperature within pre-determined minimum time after start, the PCM sets DTC P0125.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Coolant Temperature too low for Lambda regulation | 1. Poor Connector Connection 2. Defected Cooling System 3. Open or Short in ECT Sensor Signal Circuit 4. Defected ECT Sensor |
Enable Conditions |
•
ECT at engine start lower than 32℉(0℃)
•
50 sec. elapsed aftet start when difference of Lamda control enable ECT and ECT at start is 32℉(0℃)
•
100 sec. elapsed aftet start when difference of Lamda control enable ECT and ECT at start is 14.4℉(0℃)
•
200 sec. elapsed aftet start when difference of Lamda control enable ECT and ECT at start is 46℉(0℃)
•
300 sec. elapsed aftet start when difference of Lamda control enable ECT and ECT at start is 54℉(0℃)
•
Battery voltage higher than 11V and lower than 16V
•
No relevant DTC present | |
Threshold Value |
•
Coolant Temp. Signal lower than 32℉(0℃) | |
Diagnostic Time |
•
Immediate | |
Mil On Condition |
•
2 Drive Cycles |
