Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition
The control module checks for misfiring during the first 1000 engine revolutions after starting. Diagnostic trouble code (DTC) ECM-44 is stored if the control module registers a misfire which causes increased emissions.

Substitute value
- Fuel trim disabled
- Three-way catalytic converter (TWC) diagnostic disabled
- Knock retardation disabled
- Idle air trim adaptation is disabled
- Evaporative emission (EVAP) system operates at minimum.

Possible source
- Fuel stoppage
- Repeated cold starting where the engine coolant temperature (ECT) has not reached normal operating temperature between starts.
- Water in the spark plug wells
- Defective spark plugs, ignition cables, ignition coil or flywheel / pulse wheel
- Contaminated fuel or incorrect fuel type
- Blocked / leaking injector
- Intermittent open-circuit, intermittent short-circuit to ground, intermittent short-circuit to voltage supply, contact resistance or loose connection in the ignition system low-tension side, in the injector circuit or fuel pump (FP) circuit
- Blocked crankcase ventilation.
- Damaged VVT-unit.
- Moisture, flashover in the ignition system on HT side
- Leakage between the cooling system and cylinders
- Uneven compression

Fault symptom[s]
- Engine difficult to start
- The engine runs unevenly at idle or there are marked jerks in engine response when driving
- Poor performance
- High emissions.