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. When the ignition switch is turned ON, the PCM learns the EGR learned minimum position. The PCM compares the EGR learned minimum position to the EGR position sensor 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, this DTC will set.

CONDITIONS FOR RUNNING THE DTC
^ The system voltage is greater than 10 volts.
^ The EGR valve is enabled.

CONDITIONS FOR SETTING THE DTC
^ EGR position sensor is 0.2 volts more than the EGR learned minimum position when the Desired EGR Position is commanded to 0 percent.
^ The above condition is present for 80 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The MIL is turned ON.
^ A DTC is stored in memory.
^ The Freeze Frame/Failure Records are stored.
^ The Failure Records are updated after the first failure of each ignition cycle.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The control module turns OFF the malfunction indicator lamp (MIL) after the third consecutive trip the diagnostic has run and passed.
^ The history DTC will clear if the fault conditions have not been detected for 40 warm-up cycles.
^ A scan tool can be used to clear DTC information.

DIAGNOSTIC AIDS
Inspect for the following condition:

Excessive deposits on the EGR valve pintle or seat- Remove the EGR valve and check for deposits that may interfere with the EGR valve pintle extending completely or cause the pintle to stick.

If the problem is intermittent, refer to Intermittent Conditions. Intermittent Conditions

TEST DESCRIPTION

Steps 1-10:

Steps 11-18:

The numbers below refer to the step numbers on the diagnostic table.
2. This step verifies that the malfunction is present.
4. If DTC P1404 will only set under certain conditions, the malfunction may be intermittent. Refer to Diagnostic Aids. If an intermittent wiring problem is not present, test for a faulty connection at the PCM or the EGR valve. If the connections are OK and DTC P1404 continues to set, replace the EGR valve.