P1404

Steps 1 - 5:

Steps 6 - 9:

Steps 10 - 14:

Step 15:

DTC P1404 Exhaust Gas Recirculation (EGR) Closed Valve




Circuit Description
The powertrain control module (PCM) monitors the exhaust gas recirculation (EGR) valve pintle position input to ensure that the valve responds properly to commands from the PCM to detect a fault if the pintle position sensor and control circuits are open or shorted. If the PCM detects a pintle position signal voltage below the normal range of the pintle position sensor, or a signal voltage that is not within a tolerance considered acceptable for proper EGR control system operation, the PCM will set a DTC P1404

Conditions for Setting the DTC
- IAT is above 5 °C (41 °)
- EGR actual position is 16 counts below the EGR low threshold for at least 6.3 seconds.

Action Taken When the DTC Sets
- The PCM will illuminate the malfunction indicator lamp (MIL) after second consecutive 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's "Clear Info" function.

Diagnostic Aids
Check for the following conditions:
- Excessive deposits on EGR valve pintle or seat - check for deposits that may interfere with the EGR valve pintle extending completely or cause the pintle to stick.
- Poor connection or damaged harness - Inspect the wiring harness for damage. If the harness appears to be OK, observe the EGR actual position display on the Tech 2 while moving connectors and wiring harnesses related to the EGR valve. A change in the display will indicate the location of the fault

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.

NOTE: If the EGR valve show signs of excessive heat, check the exhaust system for blockage (possible a plugged catalytic converter) using the "Restricted Exhaust System Check".