P0404

CIRCUIT DESCRIPTION
The powertrain control module (PCM) monitors the EGR position sensor parameter of the exhaust gas recirculation (EGR) valve to ensure that the valve responds properly to commands from the PCM. The PCM compares the EGR position sensor parameter with the desired EGR position parameter when the valve is commanded open. If the PCM detects a difference of 12 percent between the EGR position sensor parameter and desired EGR position parameter for a calibrated amount of time, DTC P0404 will set.

CONDITIONS FOR RUNNING THE DTC
- The ignition 1 signal parameter is between 11-18 volts.
- The EGR valve is commanded open.

CONDITIONS FOR SETTING THE DTC
- The difference between the desired EGR position parameter and the EGR position sensor parameter is more than 12 percent.
- The condition is present for more than 10 seconds.

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.

DIAGNOSTIC AIDS
- Inspect for excessive deposits on the EGR pintle or seat. Remove the EGR valve.
- Inspect for deposits that may interfere with the EGR valve pintle extending completely or may cause the pintle to stick. Refer to Exhaust Gas Recirculation (EGR) System Cleaning.
- If the condition is intermittent, refer to Intermittent Conditions. Intermittent Conditions

TEST

Step 1:

Steps 2-5:

Steps 6-9:

Steps 10-15:

Steps 16-21:

Steps 22-25: