FI SYSTEM 4-41
OUTPUT VOLTAGE (VCC VOLTAGE 4.5 – 5.0 V, AMBIENT
TEMP. 20 – 30 °C, 68 – 86 °F)
ALTITUDE
(Reference)
ATMOSPHERIC
PRESSURE
OUTPUT
VOLTAGE
(ft) (m) (mmHg) kPa (V)
0

2 000
0

610
760

707
100

94
3.4 – 4.0
2 001

5 000
611

1 524
707

634
94

85
3.0 – 3.7
5 001

8 000
1 525

2 438
634

567
85

76
2.6 – 3.4
8 001

10 000
2 439

3 048
567

526
76

70
2.4 – 3.1
3
Ye s
No
If check result is not satisfactory,
replace AP sensor with a new one.
Red, G/Y or B/Br wire open or shorted to ground, or poor
0
,
G
or
X
connection. (
:
4-22)
If wire and connection are OK, intermittent trouble or faulty
ECM.
Recheck each terminal and wire harness for open circuit and
poor connection. (
:
4-5)
Remove the AP sensor.
Connect the vacuum pump gauge to the air passage port
of the AP sensor.
Arrange 3 new 1.5 V batteries in series (check that total
voltage is 4.5 – 5.0 V) and connect
-
terminal to the
ground terminal and
+
terminal to the Vcc terminal.
Check the voltage between vout and ground. Also, check
if voltage reduces when vacuum is applied up to 40 cmHg
by using vacuum pump gauge. (See table below.)
z
09917-47010: Vacuum pump gauge
09900-25008: Multi circuit tester
u
Tester knob indication: Voltage (
-
)
Replace the ECM with a new
one, and inspect it again.
ECM coupler
3
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