Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-220B

Condition




The engine control module (ECM) continuously monitors the voltage of the rear heated oxygen sensor (HO2S). A diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects that the voltage does not drop below a certain value or exceeds a certain value.
The diagnostic trouble code (DTC) can be diagnosed after approximately 3-5 minutes when the engine is running.

Substitute value
- Rear heated oxygen sensor (HO2S) control is disabled.

Possible source

Signal too high
- Short-circuit to supply voltage in the signal cable.

Signal too low
- Contact resistance and oxidation in the terminals
- 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.