T8 / P1312 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Fault indicator lamp (for further information see WIS Fault diagnosis, general) Uneven running and misfiring.

P1312 00

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)