2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: P040000-P04029B; Exhaust Gas Recirculation "A" Flow; 2020 MY Corolla Corolla HV [01/2019

Based on the driving conditions, the ECM regulates the volume of exhaust gas that is recirculated to each engine cylinder in order to lower the combustion temperature and reduce NOx emissions. The ECM monitors signals such as engine speed, engine coolant temperature, electric load, and vehicle speed. When the EGR permission conditions are met, the ECM controls the opening of the EGR valve linearly through signals to the EGR step motor.

DTC P04019C or DTC P04029B will only be stored when DTC P040000 is stored in the second trip.

MONITOR DESCRIPTION

except Mexico Models

P040000
During fuel cut (vehicle being driven with idle ON), when the change in intake manifold pressure when the EGR valve assembly is operating and not operating is insufficient, the ECM determines that the EGR valve is stuck and stores DTC P040000 and illuminates the MIL.
P04019C
During fuel cut (vehicle being driven with idle ON), when the change in intake manifold pressure when the EGR valve assembly is operating and not operating is insufficient, the intake manifold pressure is less than the threshold when the EGR valve assembly is not operating, the ECM determines that the flow through the EGR valve is hindered and stores DTC P04019C and illuminates the MIL.
P04029B
During fuel cut (vehicle being driven with idle ON), when the change in intake manifold pressure when the EGR valve assembly is operating and not operating is insufficient, the intake manifold pressure is more than the threshold when the EGR valve assembly is not operating, the ECM determines that the flow through the EGR valve is excessive and stores DTC P04029B and illuminates the MIL.

for Mexico Models

MONITOR STRATEGY

P0400 (except Mexico Models)

P0401, P0402 (except Mexico Models)

P0401 (for Mexico Models)

TYPICAL ENABLING CONDITIONS

P0400, P0402 (except Mexico Models)

P0401 (except Mexico Models)

P0401 (for Mexico Models)

TYPICAL MALFUNCTION THRESHOLDS

P0400 (except Mexico Models)

P0401 (except Mexico Models)

P0402 (except Mexico Models)

P0401 (for Mexico Models)

MONITOR RESULT

P0400: Exhaust Gas Recirculation / VVT / EGR FLOW

P0401: Exhaust Gas Recirculation / VVT / EGR FLOW INSUFFICIENCY

P0402: Exhaust Gas Recirculation / VVT / EGR FLOW EXCESS

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for at least 30 seconds.
Turn the power switch on (IG).
Turn the Techstream on.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].
With the engine running, accelerate the vehicle at 60 km/h (37 mph) or more for 5 minutes or more [B].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

When accelerating the vehicle, depress the accelerator pedal more than normal to start the engine.
Idle the engine for 30 seconds or more [C].
With brake (B) selected and the engine running, accelerate the vehicle to 80 km/h (50 mph) or more [D].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

If the engine stops, further depress the accelerator pedal to restart the engine.
Perform the fuel cut operation for 5 seconds or more, with the accelerator pedal fully released [E].
Repeat steps [D] through [E] above 3 times in one driving cycle.
Enter the following menus: Powertrain / Engine / Trouble Codes [F].
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC P040000, P04019C or P04029B.

Check the DTC judgment result.

Techstream Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions

HINT:

If the judgment result is NORMAL, the system is normal.
If the judgment result is ABNORMAL, the system has a malfunction.
If the judgment result is INCOMPLETE, perform steps [D] through [F] again.
[A] to [F]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

By using the Control the EGR Step Position Active Test, the operation of the EGR valve can be checked.

If the EGR valve is normal and is opened using the Active Test, the Data List value changes as follows.

Data List Item	Change in Data List when Number of Steps is Increased Using Control the EGR Step Position Active Test
Intake Manifold Absolute Pressure	Pressure rises

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

Powertrain > Engine > Trouble Codes

If any DTCs other than P040000, P04019C or P04029B are output, troubleshoot those DTCs first.

(d) Enter the following menus: Powertrain / Engine / Data List / Intake Manifold Absolute Pressure.

Powertrain > Engine > Data List

Powertrain > Hybrid Control > Utility

(e) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

(f) Enter the following menus: Powertrain / Engine / Active Test / Control the EGR Step Position / Data List / Engine Speed, Intake Manifold Absolute Pressure, Coolant Temperature and Engine Independent.

Powertrain > Engine > Active Test

(g) According to the display on the Techstream, compare the values of Data List item Intake Manifold Absolute Pressure before and while performing the Active Test.

The value of Intake Manifold Absolute Pressure changes according to the EGR valve step set by the Active Test.

HINT:

If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

Perform "Inspection After Repair" after repairing or replacing the intake system.

Powertrain > Engine > Clear DTCs

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Powertrain > Engine > Utility

Powertrain > Engine > Clear DTCs

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Powertrain > Engine > Utility

Powertrain > Engine > Clear DTCs

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.