P1658

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE. Possible noise when throttle pedal released.

P1658

Fault symptoms

•	CHECK ENGINE.

•	Possible noise when throttle pedal released.

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. Main relay voltage exceeding 10V. Output not active.

Fault criteria:

-	Output voltage below 2V for more than 1 s.

Dependents:

-

None.

System reaction to a fault:

-

None.

OK report:

-	As for P1110: Enable criteria fulfilled and amplitude below 1 kPa. Criteria must be fulfilled on three consecutive occasions during the same driving cycle.

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 the connecting leads or in the valve.

Functions in the diagnostic tool related to the fault:

•	Activate valve output.

See also description on activating under "Activate" menu for more information.

Check the wiring

Jiggle the leads and in-line connectors at various points and in different directions to detect any intermittent breaks or short circuits in the wiring. Observe the multimeter, test lamp or diagnostic tool while doing this.