Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-310C

Condition
The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects misfires in more than one cylinder which could damage the catalytic converter. The diagnostic trouble code (DTC) can be diagnosed when the engine is running.
This diagnostic trouble code (DTC) is stored together with other diagnostic trouble codes (DTCs) which indicate which cylinders are misfiring.

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

Possible source
- Low fuel level
- Engine does not reach normal operating temperature between several cold starts
- Water in the spark plug wells
- Damaged spark plug
- Contaminated or incorrect fuel
- Poor fuel quality (summer fuel in winter).
- Air leakage
- Blocked crankcase ventilation.
- Damaged VVT-unit.
- Blocked / leaking injector
- Faulty fuel pressure
- Uneven compression

Fault symptom[s]
- Malfunction indicator lamp (MIL) lit
- The engine misfires
- The engine is difficult to start
- Deterioration in performance
- Uneven idle
- The engine is not firing on all cylinders.