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 10 s.

Dependents:

-

None.

System reaction to a fault:

-	Purging is blocked. Correction of air mass/combustion for fuel calculation is blocked. Charge air adaptation is blocked and reset.

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 “Fault diagnosis, general” 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 value, unit kPa. The value should correspond with the other two pressure sensors when the engine is stationary. Accepted difference is 10 kPa.

See also the description of test values under ”Fault diagnosis, general” 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.