Toyota Tundra (2015 year). Manual — part 1887
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000000PF40E3X
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0101; Mass Air Flow Circuit Range / Performance
Problem; 2015 MY Tundra [08/2014 - ]
DTC
P0101
Mass Air Flow Circuit Range / Performance Problem
DESCRIPTION
Refer to DTC P0102
.
DTC
CODE
DTC DETECTION CONDITION
TROUBLE AREA
P0101
Conditions (a), (b), (c), (d) and (e) continue for more than 10
seconds (2 trip detection logic):
(a) Engine running
(b) Engine coolant temperature 70°C (158°F) or higher
(c) Throttle Position (TP) sensor voltage 0.2 V or more and less than
3.6 V
(d) Average engine load value ratio less than 0.85, or more than
1.29 (varies with estimated engine load)
Average engine load value ratio = Average engine load based on
MAF meter output / Average engine load estimated from driving
conditions
(e) Average air-fuel ratio less than -15%, or more than 15%
Mass Air Flow
(MAF) meter
Air induction
system
PCV hose
connections
MONITOR DESCRIPTION
the wire and an internal thermistor, affecting their resistance. To maintain a constant current value, the ECM
varies the voltage applied to the wire and internal thermistor. The voltage level is proportional to the airflow
through the sensor, and the ECM uses it to calculate the intake air volume.
The ECM monitors the average engine load value ratio to check the MAF meter for malfunctions. The average
engine load value ratio is obtained by comparing the average engine load calculated from the MAF meter
output to the average engine load estimated from the driving conditions, such as the engine speed and the
throttle opening angle. If the average engine load value ratio is below the threshold value, the ECM
determines that the intake air volume is low, and if the average engine load value ratio is above the threshold
value, the ECM determines that the intake air volume is high.
If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is stored.
MONITOR STRATEGY
Related DTCs
P0101: Mass air flow meter rationality
Required Sensors/Components
(Main)
Mass air flow meter
Required Sensors/Components
(Related)
Crankshaft Position (CKP) sensor, Engine Coolant Temperature (ECT)
sensor and Throttle Position (TP) sensor
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0101; Mass A...
Duration
10 times
MIL Operation
2 driving cycles
TYPICAL ENABLING CONDITIONS
Monitor runs whenever following DTCs not present
None
Throttle position (TP sensor voltage)
0.2 V or more and less than 3.6
V
Time after engine start
5 seconds or more
Battery voltage
10.5 V or more
Engine coolant temperature
70°C (158°F) or more
Estimated load
30 to 100%
MAF sensor circuit fail (P0102, P0103)
Not detected
IAT sensor circuit fail (P0112, P0113)
Not detected
ECT sensor circuit fail (P0115, P0117, P0118)
Not detected
CKP sensor circuit fail (P0335, P0337, P0338)
Not detected
TP sensor circuit fail (P0120, P0121, P0122, P0123, P0220, P0222, P0223,
P2135)
Not detected
Canister pressure sensor circuit fail (P0452, P0453)
Not detected
EVAP leak detection pump fail (P2401, P2402)
Not detected
EVAP vent valve fail (P2419, P2420)
Not detected
TYPICAL MALFUNCTION THRESHOLDS
-
1. Averaged engine load value ratio
Less than 0.85, or more than 1.29 (varies with estimated engine
load)
2. Averaged air-fuel ratio
Less than -15%, or more than 15%
WIRING DIAGRAM
Refer to DTC P0102
.
CONFIRMATION DRIVING PATTERN
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0101; Mass A...
Connect the Techstream to the DLC3.
1.
Turn the ignition switch to ON.
2.
Turn the Techstream on.
3.
Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
4.
Turn the ignition switch off and wait for at least 30 seconds.
5.
Turn the ignition switch to ON and turn the Techstream on.
6.
Start the engine and warm it up until the engine coolant temperature reaches 70°C (158°F) or
higher [A].
7.
Drive the vehicle at approximately 80 km/h (50 mph) to 112 km/h (70 mph) for 5 minutes or more
[B].
HINT:
Drive while keeping the engine load as stable as possible.
8.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
9.
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.
10.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11.
Input the DTC: P0101.
12.
Check the DTC judgment result.
TESTER
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
13.
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0101; Mass A...
A
TESTER
DISPLAY
DESCRIPTION
N/A
Unable to perform DTC judgment
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [B] and [C] again.
If 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.
14.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. 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 P0101)
(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 and ECT / Trouble Codes.
(e) Read DTCs.
Result
RESULT
PROCEED TO
P0101 is output
A
P0101 and other DTCs are output
B
HINT:
If any DTCs other than P0101 are output, troubleshoot those DTCs first.
B
GO TO DTC CHART
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0101; Mass A...
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