P0238

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE. Loss of performance.

P0238

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.

-	1636 or 1637 should not be detected.

Fault criteria:

-	Voltage on input exceeds 4.90V for more than 2.1s.

Dependents:

-

None.

System reaction to a fault:

-	The control module will continue to use a substitute value for the fuel pressure that is the same as the calculated. The following limitations apply: Boost pressure control switched off.

OK report:

-	Voltage on input falls below 4.90V for more than 2.1s.

Fault handling: (See section Fault handling III, other emissions-related components and functions 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:

-	Read value: Requested VNT Position, Actual VNT Position, Charge Air Absolute Pressure

See also description of read value under "Read Values" menu 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.