P1404

Steps 1 - 5:

Steps 6 - 10:

DTC P1404 EGR Stuck Closed




Circuit Description
The powertrain control module (PCM) monitors the EGR valve pintle position input to ensure that the valve responds properly to commands from the PCM, and to detect a fault if current pintle zero position is different from the learned zero position. If the PCM detects a pintle position signal indicates more than 30% different between current zero position and the learned zero position for more than 5 seconds, and this condition exists 3 times during trip, then the PCM will set DTC P1404.

Conditions for Setting the DTC
- Ignition voltage is between 11 and 16 volts.
- Intake Air temp is more than 3 °C.
- Desired EGR position is 0.
- Difference of EGR pintle position between current and the learned zero is more than 30 % for more than 5 seconds, and exist three time to the above condition during a trip the PCM will set DTC 1404. Then it trigger the PCM lights on.

Action Taken When the DTC Sets
- The PCM will illuminate the malfunction indicator lamp (MIL) after consecutive 2nd trip in which the fault is detected.
- The PCM will store conditions which were present when the DTC was set as Freeze Frame and in Failure Records data.

Conditions for Clearing the MIL/DTC
- The PCM will turn the MIL OFF on the third consecutive trip cycle during which the diagnostic has been run and the fault condition is no longer present.
- A history DTC P1404 will clear after 40 consecutive warm-up cycles have occurred without a fault.
- DTC P1404 can be cleared by using the scan tool Clear Info function or by disconnecting the PCM battery feed.

Diagnostic Aids
Check for the following conditions:
- Excessive carbon deposit on EGR valve shaft and/or foreign material may cause the EGR valve not to fully seated. The carbon deposit may occur by unusual port operation. Remove foreign material and/or excessive carbon deposit on EGR valve shaft may allow the EGR valve to be fully seated.
- Poor connection or damaged harness - Inspect the wiring harness for damage.

Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.