P1404

DTC P1404

CIRCUIT DESCRIPTION
The exhaust gas recirculation (EGR) valve position sensor is monitored by the engine control module (ECM). The 5-Volt reference circuit, low reference circuit, and the EGR valve position signal circuit are used by the ECM to determine the EGR valve position. When the ignition switch is turned ON, the ECM records the EGR Learned Minimum Position. The ECM compares the EGR Learned Minimum Position parameter to the EGR Position Sensor parameter. If the ECM detects that the EGR valve is still open when the ECM is commanding the EGR valve closed, DTC P1404 sets.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P1404 Exhaust Gas Recirculation (EGR) Closed Position Performance

CONDITIONS FOR RUNNING THE DTC
- The engine is running.
- The Ignition 1 Signal voltage parameter is between 11-18 volts.
- The EGR flow test is not running.
- DTC P0641 and P0651 are not set.
- The EGR valve is commanded to 0 percent for 1 second.

CONDITIONS FOR SETTING THE DTC
- The EGR Position Sensor parameter is 0.4 volt more than the EGR Learned Minimum Position parameter when the Desired EGR Position parameter is commanded to 0 percent for 24 seconds.
- The EGR Position Sensor parameter is more than 30 percent and is steady for 5 seconds after a test failure and before the next test will be run.
- The above conditions are met 4 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 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 Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics

TEST DESCRIPTION

Step 1 - Step 12:

Step 13 - Step 20:

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