RM3660EC _51 Engine / Hybrid System _080777 NR Series ENGINE CONTROL _0392339 MASS AIR FLOW METER G

NR Series ENGINE CONTROL  MASS AIR FLOW METER  INSPECTION  


PROCEDURE

Hide 22204 1.INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

a.

Check the output voltage.

i.
A357485
2.74,1.698 2.833,1.25 2.833,1.25 2.917,1.25 true 2.25,2.333 2.25,2.167 2.25,2.167 2.573,1.75 true 1.75,1.417 1.917,1.417 1.917,1.417 2.438,1.729 true 2.958,1.156 3.406,1.385 0.448,0.229 10 false 1 (+B) 2.031,2.375 2.604,2.635 0.573,0.26 10 false 2 (E2G) 1.313,1.302 1.76,1.531 0.448,0.229 10 false 3 (VG) 0.083,0.094 0.396,0.292 0.313,0.198 10 false *a
*a Component without harness connected
(Mass Air Flow Meter Sub-assembly)
V100135

Air


Connect a battery positive (+) lead to terminal 1 (+B) and negative (-) lead to terminal 2 (E2G).

NOTICE:

While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur.



ii.

Connect the positive (+) tester probe to terminal 3 (VG) and negative (-) tester probe to terminal 2 (E2G).


iii.

Blow air into the mass air flow meter sub-assembly and check that the voltage fluctuates.

OK:

The voltage changes.


If the result is not as specified, replace the mass air flow meter sub-assembly.



b.
A354279
1.729,2.26 2.188,2.26 true 2.469,2.229 2.813,2.229 true 1.563,2.156 1.875,2.313 0.313,0.156 10 false *a 2.854,2.146 3.167,2.302 0.313,0.156 10 false *b
*a Platinum Hot Wire (Heater)
*b Intake Air Temperature Sensor (Thermistor)


Perform a visual check for any foreign matter on the platinum hot wire (heater) and intake air temperature sensor (thermistor) of the mass air flow meter sub-assembly shown in the illustration.

OK:

There is no foreign matter.


If the result is not as specified, clean the mass air flow meter sub-assembly.


c.
A487341
1.698,2.615 1.344,2.615 true 1.427,1.052 1.073,1.052 true 1.167,2.531 1.479,2.688 0.313,0.156 10 false *a 1.458,0.979 1.771,1.135 0.313,0.156 10 false *c 2.354,4.385 2.667,4.542 0.313,0.156 10 false *b
*a Air Blow Gun
*b 10 mm (0.394 in.)
*c Airflow Hole


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.



i.
A398469C01
0.125,0.125 0.365,0.302 0.24,0.177 10 false *a 1.313,0.24 1.552,0.406 0.24,0.167 10 false *b 1.563,0.573 1.792,0.74 0.229,0.167 10 false *c 0.688,0.906 0.927,1.083 0.24,0.177 10 false *d 0.677,1.708 0.917,1.885 0.24,0.177 10 false *e
*a Air Blow Duration
*b 3 to 6 Seconds
*c 1 Second
*d Air Blowing
*e Air Stopped


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:

After performing cleaning, read the value of Data List item "Mass Air Flow Sensor" using the GTS and if the value is not as specified, replace the mass air flow meter sub-assembly.




d.
A167890
0.802,0.958 1.063,0.958 1.063,0.958 1.333,1.458 true 1.594,1.469 1.823,0.958 1.823,0.958 2.146,0.958 true 1.344,1.448 1.448,1.594 0.104,0.146 10 false 5 1.5,1.448 1.604,1.594 0.104,0.146 10 false 4 1.656,1.448 1.76,1.594 0.104,0.146 10 false 3 1.958,1.448 2.063,1.594 0.104,0.146 10 false 1 1.802,1.448 1.906,1.594 0.104,0.146 10 false 2 2.188,0.875 2.604,1.073 0.417,0.198 10 false THA 0.594,0.875 0.854,1.052 0.26,0.177 10 false E2 0.063,0.052 0.24,0.219 0.177,0.167 10 false *a
*a Component without harness connected
(Mass Air Flow Meter Sub-assembly)


Check the intake air temperature sensor (thermistor) resistance.

i.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
4 (THA) - 5 (E2) Always 0.48 to 17.7 kΩ


If the result is not as specified, replace the mass air flow meter sub-assembly.