P1633

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE. Loss of performance.

P1633

Fault symptoms

•	CHECK ENGINE.

•	Loss of performance.

On-Board Diagnostics

Type of diagnosis:

-	Continuous.

Enable criteria:

-	Ignition ON.

-	Battery voltage should be 10.2-15.8 V.

Fault criteria:

-	Voltage on input exceeds 4.6 V for more than 2.1 s.

Dependents:

-

None.

System reaction to a fault:

-	The control module will continue to work with a substitute value of 100 kPa.

-	The following limitation apply: Pedal position sensor adjustable to max 60 %, fuel quantity max 20 mm 3 /combustion as well as heating function, EGR and boost pressure control switched off.

OK report:

-	Voltage on input falls below 4.6 V for more than 2.1 s.

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

-

Type III.

Diagnostic help

The diagnosis concerns an electrical fault on the internal atmospheric pressure sensor.

Functions in the diagnostic tool related to the fault:

-	Read value: Atmosphere Absoslute Pressure

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.