P1108

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE. Engine speed drops slower than normal when accelerator pedal released.

P1108

Fault symptoms

•	CHECK ENGINE.

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

On-Board Diagnostics

Type of diagnosis:

-	Continuous. However, it is interrupted once the fault criteria have been fulfilled and does not restart until the next driving cycle.

Enable criteria: (Conditions that must be fulfilled for diagnostics to be performed.)

-	Engine running.

Fault criteria: (When enable criteria have been fulfilled, diagnostics will check if the fault criteria have been fulfilled.)

-	Voltage higher than 4.815 V for more than 10s.

Dependents: (Once fault criteria have been fulfilled, a number of other diagnostics must report OK before the diagnostic trouble code can finally be generated.)

-

None.

System reaction to a fault: (Once the fault criteria have been fulfilled, certain measures will sometimes be taken.)

-	Density compensation of the throttle angle is blocked.

OK report: (This diagnosis may be included as a dependent to another diagnosis and must therefore report OK even if it is continuous. The OK report is also used in fault handling to count down the fault counter.)

-	Fault criteria for P1106, P1107 or P1108 not fulfilled.

Fault handling: (Refer to section “Fault diagnosis, general” for more information.)

-

Type III.

Diagnostic help

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

Diagnostic tool functions related to this fault:

•	Pressure sensor reading, unit kPa.

When the engine is stationary, the value should correspond with that of the other two pressure sensors. Permissible difference is 10 kPa.

Refer also to the description of readings under ”Fault diagnosis, general” for more information

Check the wiring

Jiggle the wiring harness at several points and in different directions to check if there are intermittent breaks and short-circuits in the leads. Observe the multimeter, test lamp or diagnostic instrument during the test.

See .