Diagnostic Trouble Code (DTC) Information ECM-2A0A

Condition 

The engine control module (ECM) checks that there are no faults in the probe or the wiring. Diagnostic trouble code (DTC) ECM-2A0A is stored if the control module registers that the signal deviates from the permitted operating range.

Substitute Value 

• twin heated oxygen sensor (HO2S) control is disabled
• Three-way catalytic converter (TWC) diagnostics are disabled.

Possible Source 

Signal too high: 

• Short-circuit to supply voltage in the signal cable
• Short-circuit to supply voltage in the ground lead
• Defective heated oxygen sensor (HO2S).

Signal too low: 

• Short-circuit to ground in the signal cable
• Short-circuit to ground in the ground lead
• Defective heated oxygen sensor (HO2S).

Faulty signal: 

• Short-circuit in the signal cable for the pre-heating circuit
• Short-circuit in the ground lead for the preheating circuit
• Defective heated oxygen sensor (HO2S).

Signal missing: 

• Contact resistance or oxidation in the connectors
• Open-circuit in the signal cable
• Open-circuit in the ground lead
• Defective heated oxygen sensor (HO2S).

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit.