Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

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 shut off

Possible source
- defective spark plugs
- blocked/leaking injector
- uneven compression
- air leakage
- faulty fuel pressure
- low fuel level
- water in spark plug wells
- contaminated or faulty fuel
- repeated cold starting where the engine coolant temperature (ECT) has not reached normal operating temperature between starts

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