P1404

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. The PCM compares the EGR position sensor parameter to the Desired EGR position parameter when the EGR valve is commanded closed. If the EGR position sensor indicates that the EGR valve is still open when the PCM is commanding the EGR valve closed, DTC P1404 will set.

CONDITIONS FOR RUNNING THE DTC
- The ignition 1 signed parameter is between 11-18 volts.
- The PCM has enabled the EGR valve.
- The above conditions are met 3 times.

CONDITIONS FOR SETTING THE DTC
- The EGR position sensor parameter is 0.29 volts more than the EGR learned minimum position when the desired EGR position parameter is commanded to 0 percent for more than 2 seconds.
- The EGR position sensor parameter is more than 30 percent and is steady for 2 seconds after a test failure and before the next test will be run.
- The condition must be present 3 times.

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

TEST DESCRIPTION

Step 1:

Steps 2-5:

Steps 6-11:

Steps 12-17:

Steps 18-19:

The number below refers to the step number on the diagnostic table.
2. This step verifies that the malfunction is present.