Toyota Tundra 2005 Service - Repair - Maintenance page 1912

SF−38
Air
30
20
10
5
3
2
1
0.5
0.3
Acceptable
0.2
0.1
−20 0 20
(−4) (32) (68)
TEMPERATURE_C(_F)
Air
ECM
VG
E2G
SFI (1GR−FE)
E2 VG +B
THA E2G
5 4 3 2 1
40 60 80 100
(104) (140) (176) (212)
A23219
A23220
Voltmeter
A23441
− MASS AIR FLOW (MAF) METER
MASS AIR FLOW (MAF) METER
INSPECTION
1. INSPECT OUTPUT VOLTAGE
(a) Apply battery voltage across terminals 1 (+B) and 2
(E2G).
(b) Connect the positive (+) tester probe to terminal 3 (VG),
and the negative (−) tester prove to terminal 2 (E2G).
(c) Blow air into the MAF meter, and check if the voltage fluc-
tuates.
2. INSPECT RESISTANCE
Using an ohmmeter, measure the resistance between terminals
4 (THA) and 5 (E2).
Resistance:
13.6 to 18.4 kΩ at −20_C (−4_F)
2.21 to 2.69 kΩ at 20_C (68_F)
0.49 to 0.67 kΩ at 60_C (140_F)
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-
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.
If operation is not as specified, check the MAF meter (see page
DI−98) as well as the wiring and the 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
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.
If operation is not as specified, check the MAF meter (see page
DI−98), the wiring and the ECM.
SF1YQ−01