P1404
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Abnormal idling.
EGR position sensor, High. Performance Problem.
Fault symptom
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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Coolant temperature between 59°C - 110°C
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Requested EGR flow less than 45% and that 5 consecutive measurements do not differ by more than 5%.
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These conditions must be fulfilled for 3 seconds before diagnostics run.
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Fault criteria:
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EGR position is 3.5 mm higher than desired for 33 sec.
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Dependents:
System reaction to a fault:
OK report:
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Fault criteria not fulfilled.
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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 values:
Target EGR Valve Position,
EGR Valve Position EGR PWM signal
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The EGR function is switched off after 1 minute of idling (EGR valve closed). As soon as the accelerator pedal is touched, EGR control is reactivated.
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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.
