DTC P049D (2018 2019)
DTC P049D: Exhaust Gas Recirculation (EGR) Control Position Exceeded Learning Limit
General Description
The powertrain control module (PCM) controls the exhaust gas recirculation (EGR) valve opening. The system includes the EGR actuator, the EGR valve, the EGR lift sensor and the PCM. The EGR lift sensor is a semiconductor type, and it is attached to the EGR valve and shaft to determine EGR valve position. The EGR valve position signal from EGR lift sensor is transmitted to the PCM for target position feedback control. The PCM transmits a signal to the EGR actuator and moves the EGR valve to the fully closed position to register the EGR valve fully closed position after the vehicle ON mode or the EGR valve controls off. When the registration of the EGR valve fully closed position is not completed within a predetermined time or the registered value is out of predetermined range after the registration start of the EGR valve fully closed position, the PCM detects a malfunction in the EGR actuator control system and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Once per driving cycle |
| Sequence | None |
| Duration | 3.0 second or more |
| DTC Type | Two drive cycles, MIL on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| 12 volt battery voltage | 10.0 V | - |
| Vehicle | ON mode | |
| Other | EGR actuator control system is stopped | |
Malfunction Threshold
One of these conditions is met for at least 3.0 second:
- The registration of the EGR valve fully closed position is not completed within a predetermined time after the registration start of the EGR valve fully closed position.
- The registered value of the EGR valve fully closed position is 2.36 mm or more, -2.11 mm or less.
Possible Cause
- EGR actuator EEGR line failure
- EGR actuator GND line failure
- EGR actuator failure
- EGR valve position sensor failure
- EGR valve failure
- PCM failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.