Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-220B

Condition




The engine control module (ECM) continuously detects the rear heated oxygen sensor (HO2S) voltage. The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects that the voltage exceeds or is below a certain value and it is interpreted as a fault.
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.