P0406
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
EGR Position Sensor Circuit. Short to B+.
Fault symptoms
On-Board Diagnostics
Type of diagnosis:
Enable criteria:
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Battery voltage should be 10.2-15.8 V.
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P1636 or P1637 should not be detected.
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Fault criteria:
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Voltage on input exceeds 4.7 V for more than 2 s.
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Dependents:
System reaction to a fault:
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EGR control is disengaged.
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OK report:
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Voltage on input falls below 4.7 V for more than 2 s.
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Fault handling:
(See section
Fault handling III, other emissions-related components and functions
for more information)
Diagnostic help
Fault diagnosis concerns an electrical fault in connecting leads or in the sensor.
Functions in the diagnostic tool related to the fault:
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Read value:
EGR Valve Position Sensor
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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.
