Diagnostic Trouble Code (DTC) Information

ECM-2810 FRONT HEATED OXYGEN SENSOR (HO2S), PREHEATING
DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION




Condition
The control module controls preheating by pulsing the current to the PTC-element. Pulse lengths are dependent on Heated Oxygen Sensor (HO2S) temperature. Diagnostic Trouble Code (DTC) ECM-2810 is stored if the control module registers that the signal is constantly 2.5 V, higher than 3.5 V at current pulse or lower than 2.3 V at no pulse. Diagnostic Trouble Code (DTC) ECM-2810 is stored if the control module registers that heated oxygen sensor pre-heating does not function within 17 seconds of dew (condensation) point in the exhaust system being reached.

Condition
- fuel trim shut off.

Possible source

Signal too high:
- short-circuit to supply voltage in the signal cable
- defective Heated Oxygen Sensor (HO2S).

Signal too low:
- short-circuit to ground in the signal cable
- defective Heated Oxygen Sensor (HO2S).

Signal missing:
- contact resistance and oxidation
- open-circuit in power supply from system relay.

Faulty signal:
- defective Heated Oxygen Sensor (HO2S).

Condition
- Malfunction Indicator Lamp (MIL) lit.