P1312 00

Ionization Signals Implausible, Sooted Sparkplugs

SDI CGM SVG Version 1.58 Date:2018-12-07 J3 6 5 8 9 B 2 2 1 3 1 4 2 7 7 4 0 2 1 5 1 6 9 7 1 0 8 1 J3 5 4 3 J3 8 J4 3 4 3 4 3 4 3 F74006 050508 CPU CPU CPU CPU B + B + B + B + 3 2 0 b 3 2 0 c 3 2 0 d 3 2 0 a

Fault symptom

Fault indicator lamp (for further information see WIS Fault diagnosis, general)

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)