- Open or short in mass air flow meter circuit
- Mass air flow meter
- ECM
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VIAK |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 08/2016] |
| Title: 2GR-FE (ENGINE CONTROL): SFI SYSTEM: P0102,P0103; Mass Air Flow Circuit Low; 2016 MY Sienna [12/2015 - 08/2016] | ||
|
DTC |
P0102 |
Mass Air Flow Circuit Low |
|
DTC |
P0103 |
Mass Air Flow Circuit High |
DESCRIPTION
The mass air flow meter is a sensor that measures the amount of air flowing through the throttle valve.
The ECM uses this information to determine the fuel injection time and to provide the appropriate air fuel ratio.
Inside the mass air flow meter, there is a heated platinum wire which is exposed to the flow of intake air.
By applying a specific electrical current to the wire, the ECM heats it to a given temperature. The flow of incoming air cools both the wire and an internal thermistor, affecting their resistance. To maintain a constant current value, the ECM varies the voltage applied to these components in the mass air flow meter. The voltage level is proportional to the air flow through the sensor, and the ECM uses it to calculate the intake air volume.
The circuit is constructed so that the platinum hot wire and the temperature sensor create a bridge circuit, and the power transistor is controlled so that the potentials of A and B remain equal to maintain the predetermined temperature.
HINT:
When any of these DTCs are stored, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is calculated by the ECM, according to the engine speed and throttle valve position. Fail-safe mode continues until a pass condition is detected.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P0102 |
Mass air flow meter voltage is less than 0.2 V for 3 seconds (1 trip detection logic: Engine speed less than 4000 rpm) (2 trip detection logic: Engine speed 4000 rpm or more) |
|
|
P0103 |
Mass air flow meter voltage is more than 4.9 V for 3 seconds (1 trip detection logic: Engine speed less than 4000 rpm) (2 trip detection logic: Engine speed 4000 rpm or more) |
|
HINT:
When any of these DTCs are stored, check the air flow rate by entering the following menus on the Techstream: Powertrain / Engine / Data List / MAF.
|
Mass Air Flow Rate (gm/sec) |
Malfunction |
|---|---|
|
Approximately 0.0 |
|
|
271.0 or more |
|
MONITOR DESCRIPTION
If there is a defect in the mass air flow 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 mass air flow meter and stores a DTC.
Example:
When the sensor output voltage remains 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: Mass air flow meter range check (Low voltage) P0103: Mass air flow meter range check (High voltage) |
|
Required Sensors/Components (Main) |
Mass air flow meter |
|
Required Sensors/Components (Related) |
Crankshaft position sensor |
|
Frequency of Operation |
Continuous |
|
Duration |
3 seconds |
|
MIL Operation |
Immediately: Engine speed less than 4000 rpm 2 driving cycles: Engine speed 4000 rpm or more |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
|
Monitor runs whenever following DTCs are not present |
None |
TYPICAL MALFUNCTION THRESHOLDS
P0102
|
Mass air flow meter voltage |
Less than 0.2 V |
P0103
|
Mass air flow meter voltage |
Higher than 4.9 V |
COMPONENT OPERATING RANGE
|
Mass air flow meter voltage |
0.2 V or higher, and 4.9 V or less |
CONFIRMATION DRIVING PATTERN
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on.
-
Clear DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page
![2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON and turn the Techstream on [A].
- Start the engine.
- Idle the engine for 5 seconds [B].
- Enter the following menus: Powertrain / Engine / Trouble Codes [C].
-
Read pending DTC.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- Run the engine at an engine speed of 4000 rpm for 5 seconds [D].
- Enter the following menus: Powertrain / Engine / Trouble Codes [E].
-
Read pending DTC.
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: P0102 or P0103.
-
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
- Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit
HINT:
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [E] again.
-
If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (See page
).
HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
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. |
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 / Trouble Codes.
(e) Read the DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
DTC P0102 is output |
A |
|
DTC P0103 is output |
B |
| B |
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE) |
|
(a) Disconnect the mass air flow meter connector. |
|
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
B4-3 (+B) - Body ground |
Ignition switch ON |
11 to 14 V |
Text in Illustration
|
*a |
Front view of wire harness connector (to Mass Air Flow Meter) |
| NG |
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) |
(a) Disconnect the B4 mass air flow meter connector.
(b) Disconnect the B1 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
B4-5 (VG) - B1-74 (VG) |
Always |
Below 1 Ω |
|
B4-4 (E2G) - B1-75 (E2G) |
Always |
Below 1 Ω |
|
B4-5 (VG) or B1-74 (VG) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
INSPECT MASS AIR FLOW METER |
(a) Inspect the mass air flow meter, referring to the On-vehicle Inspection for Mass Air Flow Meter (See page
).
(b) Inspect the mass air flow meter, referring to the Inspection for Mass Air Flow Meter (See page
).
(c) Inspect the function of the mass air flow meter.
(1) Connect the Techstream to the DLC3.
(2) Turn the ignition switch to ON.
(3) Turn the Techstream on.
(4) Enter the following menus: Powertrain / Engine / Data List / MAF.
(5) Start the engine.
(6) Check that the reading of the mass air flow meter changes when the engine is raced.
OK:
The reading changes.
HINT:
Perform "Inspection After Repair" after replacing the mass air flow meter (See page
).
| OK |
|
| NG |
|
|
5. |
CHECK HARNESS AND CONNECTOR (SENSOR GROUND) |
(a) Disconnect the mass air flow meter connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
B4-4 (E2G) - Body ground |
Always |
Below 1 Ω |
HINT:
Perform "Inspection After Repair" after replacing the mass air flow meter (See page
).
| OK |
|
|
|
6. |
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) |
(a) Disconnect the B4 mass air flow meter connector.
(b) Disconnect the B1 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
B4-4 (E2G) - B1-75 (E2G) |
Always |
Below 1 Ω |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
7. |
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - EFI MAIN RELAY) |
(a) Disconnect the B4 mass air flow meter connector.
(b) Remove the EFI MAIN relay from the engine room relay block.
(c) Remove the A/F HTR relay from the engine room relay block.
HINT:
Remove the A/F HTR relay connected between the checked terminals as the coil inside the relay influences the measurement value.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
B4-3 (+B) - 3 (EFI MAIN relay holder) |
Always |
Below 1 Ω |
|
B4-3 (+B) or 3 (EFI MAIN relay holder) - Body ground |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|