Diagnostic Trouble Code (DTC) Information ECM-2200

Condition

Fig 1: Identifying Rear Heated Oxygen Sensor

Courtesy of VOLVO CARS CORPORATION

The engine control module (ECM) assumes two initial values for probe voltage, 0 V and 5 V. If probe preheating is active and at least one fuel shut-off has been made, the heated oxygen sensor (HO2S) maximum value must have exceeded 0.6 V and the minimum value must have been below 0.3 V. The diagnostic trouble code (DTC) is stored and the engine control module (ECM) interprets it as a fault if these limit values are not achieved after approximately 5 minutes and both the accumulated and actual heated oxygen sensor preheating have reached certain limit values.

The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute Value

Rear heated oxygen sensor (HO2S) control shut off.

Possible Source

Signal too high

Short-circuit to supply voltage in the signal cable
Damaged rear heated oxygen sensor (HO2S).

Signal too low

Short-circuit to ground in the signal cable
Open-circuit in the signal cable
Damaged rear heated oxygen sensor (HO2S).

Fault symptom[s]

Malfunction indicator lamp (MIL) lit.