P1312

P1312 00

Ionization Signals Implausible, Sooted Sparkplugs







Fault symptom
- Check Engine (OBDII, EOBD).
- Uneven running and misfiring.

On-board diagnosis

Type of diagnosis:
- Continuous

Enable criteria:
- Engine running.

Fault criteria:
- Combustion detected in several cylinders simultaneously. Camshaft position can still be synchronised.

Dependent:
P1315

System reaction to a fault:
- None

OK report:
- Ignition synchronised with plausible signals from 4 cylinders.

Fault handling:
Type III
(See section Fault handling III, "Other emission-related components and functions" for more information.)

Diagnostic help

Diagnosis regards:
- Carbonised spark plug.
- Electrical fault in connected leads or in ignition coils and CDM.

Functions in the diagnostic tool related to the fault:

Test value:
- Combustion Signal cyl 1+3
- Combustion Signal cyl 2+4
- Camshaft Position Syncronized
(See also description of readings/activations in diagnostic tool)