Diagnostic trouble code (DTC) information ECM-3100

Condition 

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects a certain number of misfires during the first 1000 engine revolutions after the engine is started.

This diagnostic trouble code (DTC) is stored together with other diagnostic trouble codes (DTCs) which indicate which cylinders are misfiring.

Substitute Value 

• 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).
• Blocked / leaking injector
• Air leakage
• Blocked crankcase ventilation.
• Damaged VVT-unit.
• 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.