Suzuki AN650 2002 - C22 Ap Sensor Circuit Malfunction

FI SYSTEM/ CVT SYSTEM 6-37
“C22” AP SENSOR CIRCUIT MALFUNCTION
INSPECTION
DETECTED CONDITION POSSIBLE CAUSE
Output voltage low or high.
NOTE:
Note that atmospheric pressure caries depending on
weather conditions as well as altitude.
Take that into consideration when inspecting voltage.
• Clogged air passage with dust.
• AP sensor circuit open or short.
• AP sensor malfunction.
• ECM malfunction.
()
0.50 V Sensor voltage
4.85 V
<
without the above range.
1
1
V
V
2
V
; AP sensor input voltage: 4.5 – 5.5 V
+ Red – - Ground
+ Red – - B/Br
z 09900-25008: Multi circuit tester
u Tester knob indication: Voltage ( - )
( )
• Remove the front box. ( : 9-18)
1
2
Ye s
Ye s
No
No
Loose or poor contacts on
the ECM coupler.
Open or short circuit in the
Red wire or B/Br wire.
; AP sensor output voltage: Approx. 3.6 V
at 760 mmHg (100 kPa)
( + G/Y – - B/Br)
z 09900-25008: Multi circuit tester
u Tester knob indication: Voltage ( - )
Check the air passage
for clogging.
Open or short circuit in the
G/Y wire.
Replace the AP sensor
with a new one.
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.
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.
Red
B/Br
Red