Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-35X3

Condition
The diagnostic trouble code (DTC) for start up problems is stored at start up if the engine control module (ECM) detects that a cylinder misfires during the first 1000 revs after engine start.
The diagnostic trouble code (DTC) for emission effect or three-way catalytic converter (TWC) damage is stored (depending on the seriousness of the misfire) if the engine control module (ECM) detects misfiring after the first 1000 revs after engine start up.
The diagnostic trouble code (DTC) indicates which cylinder is misfiring.

Substitute value
- Fuel shut-off for the misfiring cylinder when a misfire is detected
- 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
- Repeated cold starting where the engine coolant temperature (ECT) has not reached normal operating temperature between starts
- Water in the spark plug wells
- Damaged spark plug
- Contaminated or incorrect fuel
- Incorrect fuel quality (summer fuel in winter, certain markets).
- Air leakage
- Blocked crankcase ventilation.
- Damaged VVT-unit.
- Blocked / leaking injector
- Faulty fuel pressure
- Uneven compression

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