- DTC judgment completed
- System normal
| Last Modified: 11-20-2023 | 6.11:8.1.0 | Doc ID: RM10000000138AA |
| Model Year Start: 2018 | Model: Camry | Prod Date Range: [03/2017 - 06/2017] |
| Title: A25A-FKS (ENGINE CONTROL): SFI SYSTEM: P04019C; Exhaust Gas Recirculation "A" Low / Insufficient Flow; 2018 MY Camry [03/2017 - 06/2017] | ||
|
DTC |
P04019C |
Exhaust Gas Recirculation "A" Low / Insufficient Flow |
DESCRIPTION
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 No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Memory |
Note |
|---|---|---|---|---|---|---|
|
P04019C |
Exhaust Gas Recirculation "A" Low / Insufficient Flow |
Change in intake manifold pressure is small when the EGR valve opened and closed during fuel cut operation (2 trip detection logic). |
|
Comes on |
DTC stored |
SAE Code: P0401 |
MONITOR DESCRIPTION
The ECM monitors the pressure inside the intake manifold while opening and closing the EGR valve during fuel cut operation. If there is no change in the manifold absolute pressure sensor value, the ECM interprets this as a malfunction of the EGR valve assembly, illuminates the MIL and stores this DTC.
MONITOR STRATEGY
|
Related DTC |
P0401: EGR valve high flow rate/low flow rate |
|
Required Sensors/Components (Main) |
EGR valve assembly Manifold absolute pressure sensor |
|
Required Sensors/Components (Related) |
Engine coolant temperature sensor |
|
Frequency of Operation |
Once per driving cycle |
|
Duration |
Within 3 seconds |
|
MIL operation |
2 driving cycles |
|
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
|
Monitor runs whenever the following DTCs are not stored |
P0010, P1360, P1362, P1364, P1366, P2614 (Motor drive VVT system control module) P0011 (VVT system - advance) P0012 (VVT system - retard) P0013 (Exhaust VVT oil control solenoid) P0014 (Exhaust VVT system - advance) P0015 (Exhaust VVT system - retard) P0016 (VVT system - misalignment) P0017 (Exhaust VVT system - misalignment) P0031, P0032, P101D (Air fuel ratio sensor (sensor 1) heater) P0101, P0102, P0103 (Mass air flow meter) P0106, P0107, P0108 (Manifold absolute pressure) P0111, P0112, P0113 (Intake air temperature sensor) P0116, P0117, P0118 (Engine coolant temperature sensor) P011B (Engine coolant temperature/intake air temperature sensor correlation) P0121, P0122, P0123, P0222, P0223, P2135 (Throttle position sensor) P0125 (Insufficient coolant temperature for closed loop fuel control) P014C, P014D, P015A, P015B, P2195, P2196, P2237, P2238, P2239, P2252, P2253 (Air fuel ratio sensor (sensor 1)) P0171, P0172 (Fuel system) P0327, P0328 (Knock control sensor) P0335, P0337, P0338 (Crankshaft position sensor) P0340, P0342, P0343 (Camshaft position sensor) P0365, P0367, P0368 (Exhaust camshaft position sensor) P0489, P0490 (EGR control circuit) P0500 (Vehicle speed sensor) P0657, P2102, P2103, P2111, P2112, P2119 (Throttle actuator) P106A (Evaporative emission control system pressure sensor - manifold pressure sensor correlation) P11EA, P11EC, P11ED, P11EE, P11EF, P219A, P219C, P219D, P219E, P219F (Air-fuel ratio imbalance) P2228, P2229 (Atmospheric pressure sensor) |
|
Time after engine started |
3 seconds or more |
|
Time after engine fuel cut |
2499 msec or more |
|
Engine speed |
1000 to 1800 rpm |
|
Vehicle speed |
45 km/h (28 mph) or more |
|
Shift position |
Except P or N |
|
Engine coolant temperature |
75°C (167°F) or higher |
|
Battery voltage |
11 V or higher |
|
Intake air temperature |
-10°C (14°F) or higher |
|
Atmospheric pressure |
76 kPa(abs) [11 psi(abs)] or higher |
TYPICAL MALFUNCTION THRESHOLDS
|
Manifold pressure change |
Less than 2.03 kPa [2.94 psi] |
|
At engine speed |
1400 rpm |
MONITOR RESULT
Refer to detailed information in Checking Monitor Status.
Click here
![2018 - 2024 MY Camry [03/2017 - ]; A25A-FKS (ENGINE CONTROL): SFI SYSTEM: CHECKING MONITOR STATUS](/t3Portal/stylegraphics/info.gif)
P0401: Exhaust Gas Recirculation / VVT / EGR FLOW INSUFFICIENCY
|
Monitor ID |
Test ID |
Scaling |
Unit |
Description |
|---|---|---|---|---|
|
$31 |
$BD |
Multiply by 0.01 |
kPa |
Delta manifold absolute pressure |
CONFIRMATION DRIVING PATTERN
HINT:
-
After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON.
- Turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON.
- Turn the Techstream on.
- Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [A].
-
Drive 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.
- Idle the engine for 30 seconds or more [C].
-
With the shift lever in S, 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.
- Perform the fuel cut operation for 5 seconds or more, with the accelerator pedal fully released [E].
- Enter the following menus: Powertrain / Engine / Monitor / Current Monitor [F].
-
Check that Exhaust Gas Recirculation/VVT / Current is Complete.
HINT:
If the monitor item Exhaust Gas Recirculation/VVT / Current is Incomplete, perform the driving pattern again.
- Enter the following menus: Powertrain / Engine / Monitor / Current Monitor / Exhaust Gas Recirculation/VVT / Details.
-
Check the Details (EGR FLOW INSUFFICIENCY).
HINT:
Make sure that the value is between MIN and MAX.
- If the monitor item Exhaust Gas Recirculation/VVT / Current is still Incomplete, perform the following procedure.
- Enter the following menus: Powertrain / Engine / Trouble Codes.
-
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 P04019C.
-
Check the DTC judgment result.
Techstream Display
Description
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.
-
[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 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
Refer to DTC P040318.
Click here
CAUTION / NOTICE / HINT
HINT:
- By using the Control the EGR Step Position Active Test, the operation of the EGR valve can be checked.
-
When the engine is idling steadily with the EGR valve fully closed, if the EGR valve is normal and it 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
Engine Speed
Idle becomes rough
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
|
1. |
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P04019C) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes.
(e) Read the DTCs.
Powertrain > Engine > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTC P04019C is output |
A |
|
DTC P04019C and other DTCs are output |
B |
HINT:
If any DTCs other than P04019C are output, troubleshoot those DTCs first.
| B |
|
|
|
2. |
READ VALUE USING TECHSTREAM (INTAKE MANIFOLD ABSOLUTE PRESSURE) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List / Intake Manifold Absolute Pressure.
Powertrain > Engine > Data List
|
Tester Display |
|---|
|
Intake Manifold Absolute Pressure |
(e) Read the value of Intake Manifold Absolute Pressure.
Standard:
|
Techstream Display |
Specified Condition |
|---|---|
|
Intake Manifold Absolute Pressure |
80 to 110 kPa (11.6 to 15.95 psi) |
| NG |
|
|
|
3. |
PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.
HINT:
The A/C switch and all accessories should be off.
(e) Enter the following menus: Powertrain / Engine / Active Test / Control the EGR Step Position / Data List / Intake Manifold Absolute Pressure and Coolant Temperature.
Powertrain > Engine > Active Test
|
Active Test Display |
|---|
|
Control the EGR Step Position |
|
Data List Display |
|---|
|
Intake Manifold Absolute Pressure |
|
Coolant Temperature |
(f) 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.
NOTICE:
- Do not leave the EGR valve open for 10 seconds or more during the Active Test.
- Be sure to return the EGR valve to step 0 when the Active Test is completed.
- Do not open the EGR valve 30 steps or more during the Active Test.
Standard:
The value of Intake Manifold Absolute Pressure changes according to the EGR valve step set by the Active Test.
|
Data List |
Control the EGR Step Position (Active Test) |
||
|---|---|---|---|
|
Before Active Test (Engine idling) |
0 Steps |
0 to 30 Steps (Engine idling) |
|
|
Intake Manifold Absolute Pressure |
20 to 40 kPa (2.9 to 5.8 psi) |
20 to 40 kPa (2.9 to 5.8 psi) (EGR valve is fully closed) |
Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed |
HINT:
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.
|
Result |
Proceed to |
|---|---|
|
Before performing the Active Test (while the engine is idling), the value of Intake Manifold Absolute Pressure is not between 20 to 40 kPa (2.9 to 5.8 psi). |
A |
|
When performing the Active Test to change the EGR valve step between 0 (EGR valve fully closed) and 30, the value of Intake Manifold Absolute Pressure changes less than 10 kPa (1.42 psi). |
B |
|
Other than above |
C |
| B |
|
| C |
|
|
|
4. |
CHECK INTAKE SYSTEM |
(a) Check the intake system for vacuum leaks.
Click here
OK:
No leaks from intake system.
HINT:
Perform "Inspection After Repair" after repairing or replacing the intake system.
Click here
| NG |
|
REPAIR OR REPLACE INTAKE SYSTEM |
|
|
5. |
INSPECT EGR VALVE ASSEMBLY |
(a) Remove the EGR valve assembly.
Click here
(b) Check if the EGR valve is stuck open.
OK:
EGR valve is tightly closed.
HINT:
Perform "Inspection After Repair" after replacing the EGR valve assembly.
Click here
| OK |
|
| NG |
|
|
6. |
REPLACE EGR VALVE ASSEMBLY |
(a) Replace the EGR valve assembly.
Click here
HINT:
Perform "Inspection After Repair" after replacing the EGR valve assembly.
Click here
|
|
7. |
CLEAR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear the DTCs.
Powertrain > Engine > Clear DTCs
(e) Turn the ignition switch off and wait for at least 30 seconds.
|
|
8. |
CHECK WHETHER DTC OUTPUT RECURS (DTC P04019C) |
(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(b) Enter the following menus: Powertrain / Engine / Trouble Codes.
(c) Read the DTCs.
Powertrain > Engine > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTCs are not output |
A |
|
DTC P04019C is output |
B |
| A |
|
END |
|
|
9. |
REPLACE EGR COOLER ASSEMBLY |
(a) Replace the EGR cooler assembly.
Click here
HINT:
- If any of the EGR system related pipes (EGR pipe, exhaust manifold, etc.) are cracked, damaged or clogged, replace them as necessary.
-
Perform "Inspection After Repair" after replacing the EGR system.
Click here
|
|
10. |
CLEAR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear the DTCs.
Powertrain > Engine > Clear DTCs
(e) Turn the ignition switch off and wait for at least 30 seconds.
|
|
11. |
CHECK WHETHER DTC OUTPUT RECURS (DTC P04019C) |
(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(b) Enter the following menus: Powertrain / Engine / Trouble Codes.
(c) Read the DTCs.
Powertrain > Engine > Trouble Codes
OK:
DTCs are not output.
| NEXT |
|
END |
|
12. |
CLEAR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear the DTCs.
Powertrain > Engine > Clear DTCs
(e) Turn the ignition switch off and wait for at least 30 seconds.
|
|
13. |
CHECK WHETHER DTC OUTPUT RECURS (DTC P04019C) |
(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(b) Enter the following menus: Powertrain / Engine / Trouble Codes.
(c) Read the DTCs.
Powertrain > Engine > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTCs are not output |
A |
|
DTC P04019C is output |
B |
HINT:
Perform "Inspection After Repair" after replacing the EGR valve assembly.
Click here
| A |
|
END |
| B |
|
|
|