Toyota Tundra (2015 year). Manual — part 1118
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
P0102
Mass air flow meter voltage is below 0.2 V for 3
seconds
(1 trip detection logic: Engine speed is less than
4000 rpm)
(2 trip detection logic: Engine speed is 4000 rpm or
more).
Open or short in mass air flow meter
circuit
Mass air flow meter
ECM
P0103
Mass air flow meter voltage is higher than 4.9 V for 3
seconds
(1 trip detection logic: Engine speed is less than
4000 rpm)
(2 trip detection logic: Engine speed is 4000 rpm or
more).
Open or short in mass air flow meter
circuit
Mass air flow meter
ECM
HINT:
MASS AIR FLOW RATE (GM/SEC.)
MALFUNCTION
Approximately 0.0
Open in Mass Air Flow (MAF) meter power source circuit
Open or short in VG circuit
160.0 or more
Open in E2G circuit
MONITOR DESCRIPTION
If there is a defect in the MAF meter or an open or short circuit, the voltage level deviates from the normal
operating range. The ECM interprets this deviation as a malfunction in the MAF meter and stores a DTC.
Example:
When the sensor output voltage remains at less than 0.2 V, or more than 4.9 V for more than 3 seconds, the ECM
stores a DTC.
If the malfunction is not repaired successfully, a DTC is stored 3 seconds after the engine is next started.
MONITOR STRATEGY
Related DTCs
P0102: MAF meter range check (Low voltage)
P0103: MAF meter range check (High voltage)
Required Sensors/Components (Main)
MAF meter
Required Sensors/Components (Related)
Crankshaft position sensor
Duration
3 seconds
MIL Operation
Immediate: Engine speed less than 4000 rpm
2 driving cycles: Engine speed 4000 rpm or more
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0102,P0103;...
TYPICAL ENABLING CONDITIONS
Monitor runs whenever following DTCs not present
None
TYPICAL MALFUNCTION THRESHOLDS
P0102
MAF meter voltage
Less than 0.2 V
P0103
MAF meter voltage
More than 4.9 V
COMPONENT OPERATING RANGE
MAF meter voltage
0.4 V to 2.2 V
CONFIRMATION DRIVING PATTERN
Connect the Techstream to the DLC3.
1.
Turn the ignition switch to ON and turn the Techstream on.
2.
Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
3.
Turn the ignition switch off and wait for at least 30 seconds.
4.
Turn the ignition switch to ON and turn the Techstream on [A].
5.
Start the engine.
6.
Idle the engine for 5 seconds [B].
7.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
8.
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.
9.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0102,P0103;...
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
11.
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.
12.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
13.
Input the DTC: P0102 or P0103.
14.
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
N/A
Unable to perform DTC judgment
HINT:
If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [C] again.
15.
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.
16.
WIRING DIAGRAM
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0102,P0103;...
A
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.
READ DTC OUTPUT
(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
DTC P0102 is output
A
DTC P0103 is output
B
B
GO TO STEP 5
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0102,P0103;...
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