P0406

Read the instructions below then start the fault diagnostic procedure.

Symptom: None.

P0406

Fault symptom

•

None.

On-Board Diagnostics

Type of diagnosis:

-	Continuous.

Enable criteria:

-	Turn Ignition On.

-	Battery voltage should be 10.2-15.8 V.

-	P1636 or P1637 should not be detected.

Fault criteria:

-	Voltage on the input exceeds 4.7 V for more than 2s.

Dependents:

-

None.

System reaction to a fault:

-	EGR control is disengaged.

OK report:

-	Voltage on the input falls below 4.7 V for more than 2s.

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 Position Sensor

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.