P0403, P0404, P1404, P1403
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE lamp on.
Loss of performance.
Limp home.
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P0403, P0404, P1404, P1403
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P0403
EGR Valve PWM Signal Circuit. Short to Ground.
P1403, P0404
EGR Valve PWM Signal Circuit. Short to B+.
P1404
EGR Valve PWM Signal Circuit. Open Circuit.
Fault symptoms
Conditions
The following conditions apply for this DTC:
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P0403:
EGR circuit shorted to ground for more than 1.2 seconds.
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P0404:
EGR circuit shorted to B+ for more than 1.2 seconds.
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P1404:
Break in EGR circuit for more than 1.2 seconds.
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Diagnostic help
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P0403:
This DTC indicates an electrical fault in the EGR circuit. The control module uses a 50% PWM signal as a substitute value for EGR control. The control module uses a 2% PWM signal for boost pressure control. The read value on the diagnostic tool is equal to the substitute value.
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P0404:
This DTC indicates an electrical fault in the EGR circuit. The control module uses a 50% PWM signal as a substitute value for EGR control. The read value on the diagnostic tool is equal to the substitute value.
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P1404:
This DTC indicates an electrical fault in the EGR circuit. The control module uses a 50% PWM signal as a substitute value for EGR control. The read value on the diagnostic tool is equal to the substitute value.
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