P1633

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE.

P1633

Fault symptoms

•	CHECK ENGINE.

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 from atmosphere absolute pressure sensor higher than 4.920 V for more than 1 s.

Dependents:

-

None.

System reaction to a fault:

-	Starting charge air pressure value used as substitute value. Purge blocked.

OK report:

-	Fault criteria for P1631, P1632 or P1633 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 internal control module fault as the sensor is mounted in the control module.

Functions in the diagnostic tool related to the fault:

•	Pressure sensor reading, in kPa.

With the engine switched off, the reading should correspond with those of the other two pressure sensors. Permissible difference: 10 kPa.

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