P0108

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE. Engine speed drops slower than normal when accelerator pedal is released. Misfiring can occur before trouble code is generated.

P0108

Fault symptoms

•	CHECK ENGINE.

•	Engine speed drops slower than normal when accelerator pedal is released.

•	Misfiring can occur before trouble code is generated.

On-Board Diagnostics

Type of diagnosis:

-	Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.

Enable criteria:

-	Engine running.

Fault criteria:

-	Voltage higher than 4.815 V for more than 1 s.

Dependents:

-

None.

System reaction to a fault: :

-	Purging blocked. Correction of air mass/combustion for fuel calculation blocked.

OK report:

-	P0106 Test 1 and Test 2 performed once and fault criteria not fulfilled. Fault criteria for P0107 or P0108 not fulfilled.

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

-

Type III.

Diagnostic help

Fault diagnosis concerns an electrical fault in connecting leads or in the sensor.

Functions in the diagnostic tool related to the fault:

•	Pressure sensor reading, in kPa. With the engine switched off, this reading should be the same as those for the other two pressure sensors. Permissible variance is 10 kPa.

See also description of readings under "Read Values" menu for more information.

Checking the wiring

Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Observe the multimeter, diagnostic tool or test lamp during the check.