P0403, P0404, P1404
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE lamp on.
Inferior performance.
Limp home.
P0403
EGR Valve PWM Signal Circuit. Short to Ground.
P0404
EGR Valve PWM Signal Circuit. Short to B+.
P1404
EGR Valve PWM Signal Circuit. Open Circuit.
Fault symptom
Conditions
The following conditions apply for the DTC in question:
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P0403:
EGR circuit shorting to ground for more than 0.6 seconds.
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P0404:
EGR circuit shorting to B+ for more than 0.6 seconds.
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P1404:
Break in EGR circuit for more than 0.6 seconds.
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Diagnostic help
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P0403:
The diagnostic trouble code indicates an electrical fault in the EGR circuit. The control module uses 50% PWM signal as a substitute value for the EGR valve. The control module uses 2% PWM signal to regulate the boot pressure. The diagnostic tool reading is the same as the substitute value.
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P0404:
The diagnostic trouble code indicates an electrical fault in the EGR circuit. The control unit uses 50% PWM signal as a substitute value for EGR. The diagnostic tool reading is the same as the substitute value.
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P1404:
The diagnostic trouble code indicates an electrical fault in the EGR circuit. The control unit uses 50% PWM signal as a substitute value for EGR. The diagnostic tool reading is the same as the substitute value.
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