EGR System Monitor
OBD System Description - EGR System MonitorEGR Insufficient Flow
DTC Description / Detecting Condition / Confirmation Procedure
P0401 refer to DTC P0401: Exhaust Gas Recirculation (EGR) Flow Insufficient. P0401
Monitor Strategy Description
This diagnostic will determine if there is a reduction in EGR Flow.
Malfunction Criteria
Filtered MAP change (Expected - Actual) > 0 kPa (passing)
See table.
The associated change in MAP is compared with a threshold from RPM vs Baro table. > -1 kPa (failing)
The results are statistically filtered (EWMA) and compared to a decision limit.
DTC is set when the filtered result exceeds the decision limit.
Enable Conditions
EGR Flow Diag Enable Conditions:
Disabling Faults Present = FALSE boolean
AND EGR Flow test Complete this key cycle = FALSE boolean
AND EGR Flow test abort requested = FALSE boolean
AND EGR Engine Conditions Met = TRUE boolean
AND EGR Flow Transient Conditions Met = TRUE boolean
AND EGR Flow Stability Conditions Met = TRUE boolean
AND Off Board control requested = FALSE boolean
Engine Conditions:
EGR Flow Test Delay = FALSE boolean
AND EGRF Flow test abort = FALSE boolean
AND EGR Hardware Conditions Met = TRUE boolean
AND IAT > 2.75 degrees C
AND IAT < 80 degrees C
AND Vehicle Speed > 18 kph
AND Throttle Position < 1.001%
AND Baro > 72 kPa
AND Engine Speed > 1,200 rpm
Stability Conditions:
EGR Engine Conditions Met = TRUE boolean
AND EGR Flow Transient Conditions Met = TRUE boolean
AND EGR Flow Diag Enabled = TRUE boolean
AND EGR Position < 1.001%
AND Altitude Compensated MAP >= 10 kPa
AND Altitude Compensated MAP <= 36 kPa (For AT), 39 kPa (For MT)
AND Engine Speed >= 1,300 rpm
AND Engine Speed <= 2,900 rpm (For AT), 3,000 rpm (For MT)
AND Delta MAP < 1 kPa
Transient Conditions:
EGR Engine Conditions Met = TRUE boolean
AND DFCO status condition met = TRUE boolean
AND Current AC Clutch state = Previous state enum
AND Torque Fuel Ratio Correction enabled = FALSE boolean
AND Current TCC state = Previous state enum
AND Delta Idle Airflow < 14.9994 g/s
Time required
Time Length and Frequency:
Test runs once per key cycle depending on drive cycle.
EGR Excessive Flow during Crank
DTC Description / Detecting Condition / Confirmation Procedure
P0402 refer to DTC P0402: Exhaust Gas Recirculation (EGR) Flow Excessive. P0402
Monitor Strategy Description
Detects an EGR open to a large open position during crank.
Malfunction Criteria
EGR Raw Position > 70.0012%
Enable Conditions
Engine State = CRANK enum
AND Off Board control requested = FALSE boolean
AND Ignition Voltage >= 10 V
AND Ignition Voltage <= 16 V
Time required
Time Length and Frequency:
Test runs during crank
EGR Open Valve Position Error
DTC Description / Detecting Condition / Confirmation Procedure
P0404 refer to DTC P0404: Exhaust Gas Recirculation (EGR) Open Position Performance. P0404
Monitor Strategy Description
This DTC will detect an open valve position error.
Malfunction Criteria
Current - Commanded > 14.9994%
Enable Conditions
Engine State = RUN enum
AND EGR Flow Conditions Met = TRUE boolean
AND Off Board control requested = FALSE boolean
AND EGR Open Valve Disabling Faults = FALSE boolean
AND IAT > 2.75 degrees C
AND IAT < 80 degrees C
AND IAT >= 3 degrees C
EGR Closed Valve Pintle Error
DTC Description / Detecting Condition / Confirmation Procedure
P042E refer to DTC P042E: Exhaust Gas Recirculation (EGR) Closed Position Performance. P042E
Monitor Strategy Description
This DTC will detect an EGR valve that will not close completely.
Malfunction Criteria
Current - Learned Low > 10.0006%
Raw EGR Position
Enable Conditions
Engine State = RUN enum
AND Off Board control not requested = FALSE boolean
AND Closed Valve Disabling faults not present = FALSE boolean
AND EGR Hardware Conditions Met = TRUE boolean
AND IAT > 2.75 degrees C
AND IAT < 80 degrees C
AND IAT >= 3 degrees C
EGR Pintle Position Sensor Circuit Low
DTC Description / Detecting Condition / Confirmation Procedure
P0405 refer to DTC P0405: Exhaust Gas Recirculation (EGR) Position Sensor Circuit Low Voltage. P0405
Monitor Strategy Description
This DTC will detect open/short low circuit or sensor.
Malfunction Criteria
EGR position signal < 1.9989%
Enable Conditions
Engine State = RUN enum
AND Ignition Voltage >= 11.7002 V
AND Ignition Voltage <= 16 V
Time required
Time Length and Frequency:
10 sec.
EGR Pintle Position High Voltage
DTC Description / Detecting Condition / Confirmation Procedure
P0406 refer to DTC P0406: Exhaust Gas Recirculation (EGR) Position Sensor Circuit High Voltage. P0406
Monitor Strategy Description
This DTC will detect short high circuit or sensor.
Malfunction Criteria
EGR position signal > 98.0011%
Enable Conditions
Engine State = RUN enum
AND Ignition Voltage >= 11.7002 V
AND Ignition Voltage <= 16 V
Time required
Time Length and Frequency:
10 sec.
MODE $06 Data:
MODE $06 Data