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4·30
FI
SYSTEM
DIAGNOSIS
"C13" lAP SENSOR CIRCUIT MALFUNCTION
DETECTED
CONDITION
POSSIBLE
CAUSE
lAP
sensor
voltage low or high. • Clogged
vacuum
passage between throttle
body
0.5 V ~
Sensor
voltage < 4.85 V
and
lAP
sensor.
(without the above range.) • Air being drawn from
vacuum
passage between
NOTE:
throttle body and lAP sensor.
Note that atmospheric pressure varies depending on
•
lAP
sensor
circuit open or shorted to ground.
weather conditions
as
well as altitude.
•
lAP
sensor
malfunction.
Take that into consideration when inspecting volt- •
ECM malfunction.
age.
INSPECTION
Step 1
1) Lift and support the fuel
tank
with its prop stay.
(C75-5)
2) Turn the ignition switch OFF.
3)
Check
the
lAP
sensor
coupler for loose or
poor
contacts.
If OK, then measure the lAP
sensor
input voltage.
4) Disconnect the
lAP
sensor coupler.
5) Turn the ignition switch ON.
6) Measure the voltage at the Red wire and ground.
If OK, then measure the voltage at the Red wire and B/Br
wire.
_ lAP
sensor
input
voltage: 4.5 - 5.5 V
(0
Red - 8 Ground)
(0
Red - 8 B/Br)
!T'{%t!
09900-25008: Multi
circuit
tester set
~
Tester
knob
indication: Voltage
(=-=-::)
Is the voltage OK?
YES
Go to Step 2.
•
Loose or
poor
contacts on the ECM coupler.
NO
•
Open
or short circuit in the Red wire or B/Br
wire.