Diagnostic trouble code (DTC) information
WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
Condition
Diagnostic trouble code (DTC) ECM- 4D is stored if the control module registers misfiring of such severity that the three-way catalytic converter (TWC) will be damaged.
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.
- Altitude compensation disabled.
Possible Source
- Fuel stoppage.
- Repeated cold starting where the engine coolant temperature (ECT) has not reached normal operating temperature between starts.
- Water in spark plug wells.
- Defective spark plugs, ignition cables, distributor cap, rotor, 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 cooling system and cylinder.
- 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.