Diagnostic Trouble Code (DTC) Information ECM-254D
Condition
The engine control module (ECM) regulates preheating by pulsing the current to the positive temperature coefficient (PTC) element (bank 2) in the front heated oxygen sensor (HO2S). Pulse lengths are dependent on the temperature of the heated oxygen sensor (H02S).
The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that the signal is lower than a certain value when preheating is deactivated.
Substitute Value
- Heated oxygen sensor (HO2S) control is disabled.
Possible Source
- Short-circuit to ground in the signal cable
- Damaged front heated oxygen sensor (HO2S) (bank 2).
Fault symptom[s]
- Malfunction indicator lamp (MIL) lit.