P1312

P1312 00

Ionization Signals Implausible, Sooted Sparkplugs







Fault symptom
Check Engine (OBD II, 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 synchronized.

Dependent
P1315

System reaction to a fault:
None

OK report:
Ignition synchronized with plausible signals from 4 cylinders.

Fault handling:
Type III
(See Description of On-Board Diagnostics/Fault handling III, "Other emission-related components and functions" for more information.)

Diagnostic help

Diagnosis regards:
Carbonized spark plug.
Electrical fault in connecting leads or in the 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 Synchronized