Toyota Tundra (2015 year). Manual — part 1166
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000003Q3501WX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0401; Exhaust Gas Recirculation Flow Insufficient
Detected; 2015 MY Tundra [08/2014 - ]
DTC
P0401
Exhaust Gas Recirculation Flow Insufficient Detected
DESCRIPTION
signals such as engine speed, coolant temperature, electric load, and vehicle speed. When the EGR permission
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
P0401
Change in intake manifold pressure is small when the EGR valve is
opened and closed during idle fuel cut operation
(2 trip detection logic)
EGR valve assembly
EGR passages
EGR cooler assembly
Manifold absolute
pressure sensor
Intake system
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 in the EGR valve assembly, illuminates the MIL and stores the DTC (2 trip detection logic).
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, vehicle speed sensor
Duration
3 seconds
MIL operation
2 driving cycles
TYPICAL ENABLING CONDITIONS
Monitor runs whenever following DTCs are not present
None
Time after engine started
3 seconds or more
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0401; Exhaus...
Time after engine fuel cut
1 second or more
Engine speed
1200 to 1800 rpm
Vehicle speed
20 km/h (12.5 mph) or more
Engine speed change (per 65 msec.)
-40 to 10 rpm
Time after engine load becomes stable (Brake, lock-up)
More than 1 sec
Shift position
Except "P" or "N" range
Engine coolant temperature
75°C (167°F) or more
Battery voltage
11 V or more
Intake air temperature
-10°C (14°F) or more
Atmospheric pressure
76 kPa (570 mmHg) or more
TYPICAL MALFUNCTION THRESHOLDS
Manifold pressure change
Less than 1.8125 kPa (14 mmHg)
Engine speed
1400 rpm
CONFIRMATION DRIVING PATTERN
Connect the Techstream to the DLC3.
1.
Turn the ignition switch ON and turn the Techstream on.
2.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure)
.
3.
Turn the ignition switch off and wait for 30 seconds.
4.
Turn the ignition switch ON and turn the Techstream on [A].
5.
Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more
[B].
HINT:
The A/C switch and all accessory switches should be off and the shift lever should be in P or N.
6.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0401; Exhaus...
Drive the vehicle at 60 km/h (37 mph) for 5 minutes or more [C].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
7.
Idle the engine for 30 seconds or more [D].
8.
Drive the vehicle at 60 km/h (37 mph) and select the S4 range with the shift lever in S [E].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
9.
Perform fuel cut operation for 5 seconds or more with the accelerator pedal fully released [F].
HINT:
When "Idle Fuel Cut" in the Data List is ON, fuel cut is operating.
10.
Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor / Exhaust Gas
Recirculation/VVT / Current [G].
11.
Check that the Exhaust Gas Recirculation/VVT / Current monitor is Complete.
HINT:
If the monitor is Incomplete, perform the driving pattern again.
12.
Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor / Exhaust Gas
Recirculation/VVT / Details / EGR FLOW INSUFFICIENCY / Details.
13.
Check the test Details (EGR FLOW INSUFFICIENCY).
HINT:
Make sure that the values are between MIN and MAX.
14.
If the monitor is still Incomplete, perform the following procedure.
15.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
16.
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.
17.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
18.
Input the DTC: P0401.
19.
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
20.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0401; Exhaus...
TECHSTREAM
DISPLAY
DESCRIPTION
N/A
Unable to perform DTC judgment
HINT:
If the judgment result shows ABNORMAL, the system has a malfunction.
If the DTC judgment result is INCOMPLETE or N/A and no pending DTC is output, drive the
vehicle again at 60 km/h (37 mph) and select the S4 range with the shift lever in S, perform
fuel cut operation for 5 seconds or more with the accelerator pedal fully released, and then
check the DTC judgment result.
If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and
check for permanent DTCs
.
HINT:
If a permanent DTC is output, the system is malfunctioning.
If no permanent DTC is output, the system is normal.
21.
WIRING DIAGRAM
INSPECTION PROCEDURE
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0401; Exhaus...
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