DTC ECM-35X3

Condition







Diagnostic trouble code (DTC) ECM-35X3 is stored if the engine control module (ECM) registers that the engine misfires so badly that there is a risk of damaging the three-way catalytic converter (TWC).

The diagnostic trouble code (DTC) indicates which cylinder(s) has/have misfired.

Substitute value
- Three-way catalytic converter (TWC) diagnosis shut off
- Leakage diagnosis shut off
- Rear heated oxygen sensor control shut off
- Fuel trim switched off.

Possible source
- Defective spark plug
- Blocked/leaking injector
- Uneven compression
- Air leakage
- Faulty fuel pressure
- Low fuel level
- Water in the spark plug wells
- Contaminated or incorrect fuel
- Repeated cold starting where the engine coolant temperature (ECT) has reached normal operating temperature between starts

Fault symptom[s]
- malfunction indicator lamp (MIL) flashes
- engine misfires
- engine is difficult to start
- poor performance
- Uneven idle
- engine is not firing on all cylinders.