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SF-38
SFI (1GR-FE) - MASS AIR FLOW (MAF) METER
Air MASS AIR FLOW (MAF) METER SF1YQ-01
INSPECTION
E2 VG +B 1. INSPECT OUTPUT VOLTAGE
THA E2G
(a) Apply battery voltage across terminals 1 (+B) and 2
(E2G).
(b) Connect the positive (+) tester probe to terminal 3 (VG),
5 4 3 2 1 and the negative (-) tester prove to terminal 2 (E2G).
(c) Blow air into the MAF meter, and check if the voltage fluc-
tuates.
30 2. INSPECT RESISTANCE
20
Using an ohmmeter, measure the resistance between terminals
10 4 (THA) and 5 (E2).
5 Resistance:
RESISTANCE k
3 13.6 to 18.4 k at -20_C (-4_F)
2
2.21 to 2.69 k at 20_C (68_F)
1 0.49 to 0.67 k at 60_C (140_F)
0.5
0.3
0.2 Acceptable
0.1
-20 0 20 40 60 80 100
(-4) (32) (68) (104) (140)(176) (212)
TEMPERATURE_C(_F)
A23219
3. INSPECT MASS AIR FLOW METER
(a) If using a hand-held tester:
(1) Connect the hand-held tester to the DLC3.
(2) Turn the ignition switch to the ON position.
(3) Enter the following menus: DIAGNOSIS / EN-
Air HANCED OBD II / DATA LIST / MAF
(4) Blow air into the MAF meter, and check that the air
flow value of the CURRENT DATA changes.
A23220 If operation is not as specified, check the MAF meter (see page
DI-98) as well as the wiring and the ECM.
ECM (b) If not using a hand-held tester:
(1) Turn the ignition switch to the ON position.
(2) Connect the positive tester probe of the voltmeter
to terminal VG of the ECM and the negative tester
VG E2G probe of the voltmeter to terminal E2G of the ECM.
(3) Blow air into the air flow meter, and check if the volt-
age fluctuates.
Voltmeter
If operation is not as specified, check the MAF meter (see page
A23441 DI-98), the wiring and the ECM.
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