C22" Ap Sensor Circuit Malfunction - Suzuki AN650 2002 Service Manual

"C22" AP SENSOR CIRCUIT MALFUNCTION

DETECTED CONDITION
Output voltage low or high.
0.50 V Sensor voltage
(
without the above range.
NOTE:
Note that atmospheric pressure caries depending on
weather conditions as well as altitude.
Take that into consideration when inspecting voltage.
INSPECTION
• Remove the front box. (
1 Turn the ignition switch OFF.
Check the AP sensor coupler for loose or poor contacts.
If OK, then measure the AP sensor input voltage.
Turn the ignition switch ON.
Disconnect the AP sensor coupler.
Measure the voltage between Red wire and ground.
If OK, then measure the voltage between Red wire and
; B/Br wire.
AP sensor input voltage: 4.5 – 5.5 V
z
09900-25008: Multi circuit tester
u
Tester knob indication: Voltage (
Yes
2
Connect the AP sensor coupler.
Insert the copper wires to the lead wire coupler.
Turn the ignition switch ON.
Measure the AP sensor output voltage at the wire side
; coupler between G/Y and B/Br wires.
AP sensor output voltage: Approx. 3.6 V
z
09900-25008: Multi circuit tester
u
Tester knob indication: Voltage (
Yes
<
4.85 V
)
:
9-18)
+ -
( + Red – - Ground
Red – B/Br
-
)
Loose or poor contacts on
No
the ECM coupler.
Open or short circuit in the
Red wire or B/Br wire.
at 760 mmHg (100 kPa) + -
( G/Y – B/Br)
-
)
Check the air passage
No
for clogging.
Open or short circuit in the
G/Y wire.
Replace the AP sensor
with a new one.
POSSIBLE CAUSE
• Clogged air passage with dust.
• AP sensor circuit open or short.
• AP sensor malfunction.
• ECM malfunction.
)
1
V
1
V
2
V
FI SYSTEM/ CVT SYSTEM 6-37
Red
B/Br
Red