Lexus ES: On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY
HINT:
Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.
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(a) Read the value of Data List item "Mass Air Flow Sensor" using the Techstream.
NOTICE:
Perform the inspection of the mass air flow meter sub-assembly while it is installed to the air cleaner cap sub-assembly (installed to the vehicle).
(1) Check and ensure the following conditions:
- Turn off all electrical loads, such as the air conditioning, etc.
- Check that the coolant temperature is 75°C (167°F) or more.
- Put the shift lever in the N position.
(2) Connect the Techstream to the DLC3.
(3) Start the engine.
(4) Turn the Techstream on.
(5) Enter the following menus: Powertrain / Engine / Data List / Mass Air Flow Sensor.
Powertrain > Engine > Data List| Tester Display |
|---|
| Mass Air Flow Sensor |
(6) According to the display on the Techstream, read the Data List when the engine is running.
Standard Condition:
| Techstream Display | Condition | Specified Condition |
|---|---|---|
| Mass Air Flow Sensor | Idling (engine warmed up) | 1.2 to 3.2 gm/sec |
| 3000 rpm (with out load) | 7.5 to 12.5 gm/sec |
If the result is not as specified, clean the mass air flow meter sub-assembly.
If the result is within the specified range, check the intake air temperature sensor (thermistor) resistance.
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2. CLEAN MASS AIR FLOW METER SUB-ASSEMBLY
NOTICE:
If the mass air flow meter sub-assembly is removed and installed 10 times or more, the thread of the hole of the mass air flow meter sub-assembly may be damaged. Therefore, do not loosen the screws of the mass air flow meter sub-assembly.
(a) Remove the air cleaner cap sub-assembly.
(b) Clean the mass air flow meter sub-assembly.
NOTICE:
- Do not contact the mass air flow meter sub-assembly with the nozzle of the air blow gun.
- Do not insert the nozzle of the air blow gun into the airflow hole.
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| *1 | Mass Air Flow Meter Sub-assembly |
| *a | Air Blow Gun |
| *b | 10 mm (0.394 in.) |
| *c | Airflow Hole |
| (1) Using an air blow gun, clean the hole of the mass air flow meter sub-assembly by applying approximately 10 intermittent bursts of air to the airflow hole at a pressure of approximately 392 to 981 kPa (4.0 to 10.0 kgf/cm2, 57 to 142 psi). HINT: Apply 5 intermittent bursts of air to the airflow hole at 2 locations. |
|
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(c) Install the air cleaner cap sub-assembly.
3. PERFORM INITIALIZATION
(a) Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.
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