DTC P0401 Exhaust Gas Recirculation (EGR) Flow Insufficient Detected (4JJ3 with DPD)

1. DTC P0401 description

A microprocessor is built into the EGR valve. The internal microprocessor controls the EGR motor according to the commands from the ECM. The ECM calculates the desired EGR position based on the driving condition of the engine, and sends it to the EGR valve via CAN. The EGR valve lift amount is calculated by the microprocessor inside the EGR valve, and is sent to the ECM via CAN. Also, the ECM calculates the desired oxygen concentration of the intake air according to the engine speed and fuel injection quantity, and calculates the actual oxygen concentration of the intake air from each sensor value. When the EGR is ON, in response to the desired oxygen concentration of the intake air, this control adjusts the actual oxygen concentration of the intake air by changing the EGR valve position based on the engine operating conditions. The EGR valve has the following circuits.

  • Ignition power supply circuit
  • CAN High circuit
  • CAN Low circuit
  • Ground circuit

If the ECM detects that the difference between the actual oxygen concentration of the intake air and the desired oxygen concentration of the intake air is more than or equal to the predetermined value, the DTC is set.

2. Condition for setting DTC P0401

Condition for running the DTC

  • The battery voltage is 9 to 16 V.
  • The ignition switch is ON.

Also, the following are met for 4 seconds or more:

  • The engine speed is within the predetermined range and does not change by 20 rpm or more.
  • The fuel injection quantity is within the predetermined range and does not change by 1.7 mm3/st or more.
  • The engine coolant temperature is 68 to 99°C {154 to 210°F}.
  • The intake air temperature is -11 to 68°C {12 to 154°F}.
  • The barometric pressure is 70 to 120 kPa {10 to 17 psi}.
  • EGR feedback mode is active.
  • The heated oxygen sensor is valid.
  • DPD regeneration is stopped.
  • DTCs P0030, P0053, P007C, P007D, P0101, P0102, P0103, P0112, P0113, P0130, P0241, P0242, P041C, P041D, P0472, P0473, P0560, P0606, P060B, P064D, P0651, P0697, P06A3, P06D2, P06D6, P2228, and P2229 are not set.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0030 Lambda Sensor Temperature Error".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0053 Lambda Sensor Heater Line Error".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P007C CAC Outlet Temperature Sensor Circuit Low".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P007D CAC Outlet Temperature Sensor Circuit High".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0101 Mass Air Flow Circuit Range/Performance".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0102 Mass Air Flow Circuit Low Input".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0103 Mass Air Flow Circuit High Input".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0112 Intake Air Temperature Sensor Circuit Low".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0113 Intake Air Temperature Sensor Circuit High".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0130 Lambda Sensor Circuit Failure".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0241 Turbocharger Boost Sensor Circuit Low".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0242 Turbocharger Boost Sensor Circuit High".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P041C Exhaust Gas Recirculation (EGR) Temperature Sensor Circuit Low".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P041D Exhaust Gas Recirculation (EGR) Temperature Sensor Circuit High".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0472 EGR Gas Pressure Sensor Circuit Low".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0473 EGR Gas Pressure Sensor Circuit High".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0560 System Voltage".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0606 ECM/PCM Processor".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P060B Internal Control Module A/D Processing Performance".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P064D Lambda Sensor Control IC Error".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0651 Sensor Reference Voltage 2 Circuit".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0697 Sensor Reference Voltage 3 Circuit".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P06A3 Sensor Reference Voltage 4 Circuit".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P06D2 Sensor Reference Voltage 5 Circuit".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P06D6 Sensor Reference Voltage 6 Circuit".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P2228 Barometric Pressure Circuit Low".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P2229 Barometric Pressure Circuit High".

Condition for setting the DTC

  • The ECM detects that the actual oxygen concentration of the intake air is higher than the desired oxygen concentration of the intake air by more than or equal to the predetermined value.

3. Action taken when DTC P0401 sets

  • The ECM illuminates the MIL. Refer to Action taken when DTC sets - Type B.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC type definitions".

4. Condition for clearing DTC P0401

  • Refer to Conditions for clearing the MIL/DTC - Type A or Type B.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC type definitions".

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