CHECK MASS AIR FLOW METER SUB-ASSEMBLY (POWER SOURCE OF MASS AIR FLOW METER SUB-ASSEMBLY)
REPLACE MASS AIR FLOW METER SUB-ASSEMBLY
CHECK IF DTC RECURS (SEE IF DTC P0100 IS OUTPUT AGAIN)
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)
REPAIR OR REPLACE HARNESS OR CONNECTOR
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
DTC P0100 Mass Air Flow Circuit |
DESCRIPTION
The mass air flow meter sub-assembly is a sensor that measures the intake air volume using the following built-in components:- By-pass duct (allows some of the intake air to flow past a silicon chip sensor).
- Silicon chip sensor (uses a heater control bridge circuit and temperature sensor bridge circuit to detect the difference in the temperature of the intake air that passes the sensors positioned before and after the heater).
- Control circuit (converts the difference in temperature into a pulse signal and performs correction).
The ECM calculates the intake air volume based on the pulse signal received from the mass air flow meter sub-assembly.
The heater control bridge circuit has a temperature sensor and power transistor, and maintains the heater temperature at a specific temperature.
| *1 | Mass Air Flow Meter Sub-assembly | - | - |
| *a | Silicon Chip Sensor | *b | By-pass Duct |
| *c | Heater | *d | Heater Thermistor |
| *e | Intake Air | *f | Temperature Sensor (After Heater) |
| *g | Temperature Sensor (Before Heater) | *h | Intake Air Thermistor 1 |
| *i | Intake Air Thermistor 2 | *j | Temperature Sensor (Before Heater) 1 |
| *k | Temperature Sensor (After Heater) 2 | *l | Temperature Sensor (After Heater) 1 |
| *m | Temperature Sensor (Before Heater) 2 | *n | Control Circuit |
| *o | Heater Control Bridge Circuit | *p | Temperature Sensor Bridge Circuit |
| *q | Air Flow | - | - |
| DTC Detection Drive Pattern | DTC Detection Condition | Trouble Area |
| 3 seconds after engine is started | Mass air flow meter sub-assembly signal frequency is less than 0.1 kHz with the engine speed at 400 rpm or more for 3 seconds (1 trip detection logic). |
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| DTC No. | Data List |
| P0100 | MAF |
- HINT:
- If DTC P0100 is stored, the following symptoms may appear (as the ECM mistakenly determines that there is less air than the actual intake air amount, EGR is decreased according to the target EGR):
- Combustion noise worsens
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0AVX.html) and initialization (LandCruiser RM000000TIN08IX.html).
- HINT:
- Read freeze frame data using the GTS. 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, and other data from the time the malfunction occurred.
| 1.CHECK MASS AIR FLOW METER SUB-ASSEMBLY (POWER SOURCE OF MASS AIR FLOW METER SUB-ASSEMBLY) |
Disconnect the mass air flow meter sub-assembly connector.
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Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Switch Condition Specified Condition C33-3 (5V) - Body ground Engine switch on (IG) 4.8 to 5.2 V C33-1 (FG) - C33-2 (E2G) Engine switch on (IG) 4.8 to 5.2 V
Text in Illustration *a Front view of wire harness connector
(to Mass Air Flow Meter Sub-assembly)
Reconnect the mass air flow meter sub-assembly connector.
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| OK | |
| 2.REPLACE MASS AIR FLOW METER SUB-ASSEMBLY |
Replace the mass air flow meter sub-assembly (LandCruiser RM000000VHD05PX.html).
| NEXT | |
| 3.CHECK IF DTC RECURS (SEE IF DTC P0100 IS OUTPUT AGAIN) |
Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS on.
Clear the DTCs (LandCruiser RM000000PDK1ENX.html).
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG) and turn the GTS on.
Start the engine and wait for 3 seconds or more.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the DTCs.
Result Result Proceed to DTC P0100 is output A DTCs are not output B
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| A | |
| 4.REPLACE ECM |
Replace the ECM (LandCruiser RM0000013Z002DX.html).
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| 5.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) |
Disconnect the mass air flow meter sub-assembly connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition C33-3 (5V) - C150-25 (VCVG) Always Below 1 Ω C33-1 (FG) - C150-33 (VG) Always Below 1 Ω C33-2 (E2G) - C150-24 (EVG) Always Below 1 Ω C33-3 (5V) or C150-25 (VCVG) - Body ground and other terminals Always 10 kΩ or higher C33-1 (FG) or C150-33 (VG) - Body ground and other terminals Always 10 kΩ or higher C33-2 (E2G) or C150-24 (EVG) - Body ground and other terminals Always 10 kΩ or higher
Reconnect the mass air flow meter sub-assembly connector.
Reconnect the ECM connector.
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| OK | |
| 6.REPLACE ECM |
Replace the ECM (LandCruiser RM0000013Z002DX.html).
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| 7.REPAIR OR REPLACE HARNESS OR CONNECTOR |
Repair or replace the harness or connector.
| NEXT | |
| 8.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED |
Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS on.
Clear the DTCs (LandCruiser RM000000PDK1ENX.html).
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG) and turn the GTS on.
Start the engine and wait for 3 seconds or more.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Confirm that the DTC is not output again.
| NEXT | ||
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