P0404

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE.

P0404

Fault symptoms

•	CHECK ENGINE.

On-Board Diagnostics

Type of diagnosis:

-	Continuous.

Enable criteria:

-	Ignition ON.

-	EGR control active.

Fault criteria:

-	Voltage on input exceeds 80% of battery voltage for more than 0.3s.

Dependents:

-

None.

System reaction to a fault:

-	EGR control is disengaged.

OK report:

-	Voltage on the input exceeds or falls below 80 % for more than TBD s.

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: EGR Valve Control Signal

-	Activate: EGR Control Valve

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

See also the description of activations under "Activate" 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.