P0404
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
EGR Valve PWM Signal Circuit. Short to B+.
Fault symptoms
On-Board Diagnostics
Type of diagnosis:
Enable criteria:
Fault criteria:
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Voltage on input exceeds 80% of battery voltage for more than 0.3s.
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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 the input exceeds or falls below 80 % for more than TBD 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 Control Signal
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Activate:
EGR Control Valve
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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.
