Engine General Information and Diagnosis: 1A-36
5 1) Turn the ignition switch OFF.
2) Remove the IAP sensor (No.1). Refer to “IAP Sensor
(No.1) Removal and Installation in Section 1C (Page 1C-
2)”.
3) Connect the vacuum pump gauge to the vacuum port of
the IAP sensor (No.1).
4) Arrange 3 new 1.5 V batteries in series (1) (check that
total voltage is 4.5 – 5.0 V) and connect (–) terminal to
the ground terminal “B” and (+) terminal to the Vcc
terminal “A”.
5) Check the voltage between Vout terminal “C” and
ground. Also, check if voltage reduces when vacuum is
applied by using vacuum pump gauge.
Special tool
(A): 09917–47011 (Vacuum pump gauge)
(B): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Voltage ( )
Is the voltage OK?
• B, W/Bl or B/Br wire
open or shorted to
the ground, or poor
“11”, “26” or “29”
connection.
• If wire and
connection are OK,
intermittent trouble or
faulty ECM.
• Recheck each
terminal and wire
harness for open
circuit and poor
connection.
• Replace the ECM
with a known good
one, and inspect it
again. Refer to “ECM
Removal and
Installation in Section
1C (Page 1C-1)”.
If check result is not
satisfactory, replace the
IAP sensor (No.1) with a
new one. Refer to “IAP
Sensor (No.1) Removal
and Installation in
Section 1C (Page 1C-
2)”.
Step Action Yes No
1
(A)
“C”
“A”
“B”
(B)
I718H1110030-02
0 – 2 000
2 001 – 5 000
5 001 – 8 000
8 001 – 10 000
0 – 610
611 – 1 524
1 525 – 2 438
2 439 – 3 048
760 – 707
707 – 634
634 – 567
567 – 526
100 – 94
94 – 85
85 – 76
76 – 70
3.4 – 4.0
3.0 – 3.7
2.6 – 3.4
2.4 – 3.1
ALTITUDE (Reference)
ATOMOSPHERIC
PRESSURE
OUTPUT
VOLTAGE
ft m
mmHg
kPa V
I718H1110167-02
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