C22" Ap Sensor Circuit Malfunction - Suzuki DL1000 Service Manual

4-40 FI SYSTEM

"C22" AP SENSOR CIRCUIT MALFUNCTION

DETECTED CONDITION
Low pressure and low voltage.
High pressure and high voltage.
0.10 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 volt-
age.
INSPECTION :
• Remove the seat. (
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.
Disconnect the AP sensor coupler.
Turn the ignition switch ON.
Measure the voltage between Red wire and ground.
If OK, then measure the voltage between Red wire and
;
B/Br wire terminal.
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. 4.0 V
z
09900-25008: Multi circuit tester
u
Tester knob indication: Voltage (
Yes
<
4.80 V
)
6-4)
+ -
+ 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.
• Red wire circuit open or shorted to ground.
• B/Br or G/Y wire circuit shorted to ground.
• AP sensor malfunction.
• ECM malfunction.
)
1
V
1
V
2
B/Br
Red
V
G/Y