P0404

DTC P0404

CIRCUIT DESCRIPTION
The engine control module (ECM) monitors the position of the exhaust gas recirculation (EGR) valve through the EGR valve position sensor. The EGR valve position sensor sends a feedback voltage on the signal circuit to the ECM. This voltage varies depending on the position of the EGR valve. The ECM interprets this voltage as the position of the EGR valve. If the ECM detects a difference between the actual EGR position and the commanded EGR position, DTC P0404 sets.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0404 Exhaust Gas Recirculation (EGR) Open Position Performance

CONDITIONS FOR RUNNING THE DTC
- DTCs P0112, P0113, P0405, P0406, and P0502 are not set.
- The ignition voltage is between 11.7-16 volts.
- The ambient air temperature is more than 3°C (37°F).
- The desired EGR position is more than 0 percent and steady within 3 percent.
- DTC P0404 runs continuously every 125 milliseconds when the above conditions are met.

CONDITIONS FOR SETTING THE DTC
- The ECM detects a difference between the actual EGR position and the commanded EGR position of more than 15 percent for more than 30 seconds.
- The above condition occurs 3 times with 5 seconds between each test.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

TEST

Steps 1-2:

Steps 3-5:

Steps 6-10:

Steps 11-15:

Steps 16-18:

Steps 19-23:

Step 24: