C22" Ap Sensor Circuit Malfunction - Suzuki GSX-R1000 Service Manual

4·40 FI SYSTEM DIAGNOSIS
"C22"
AP SENSOR CIRCUIT MALFUNCTION
DETECTED CONDITION
POSSIBLE CAUSE
AP sensor voltage low or high.
• Clogged air passage with dust.
0.5 V ;;;;; Sensor voltage
<
4.S5 V
•
Red wire circuit open or shorted to ground .
(without the above range.)
• B/Br or G/Y wire circuit shorted to ground.
NOTE:
• AP sensor malfunction.
Note that atmospheric pressure varies depending on •
ECM malfunction.
weather conditions as well as altitude.
Take that into consideration when inspecting volt-
age.
INSPECTION
Step 1
1)
Remove the front seat.
(CTS-6)
2) Turn the ignition switch OFF.
3) Check the AP sensor coupler for loose or poor contacts.
If OK, then measure the AP sensor input voltage.
4)
Disconnect the AP sensor coupler
CD.
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.
B
AP sensor input voltage: 4.5 - 5.5 V
(CB
Red -
8
Ground)
(CB
Red -
8
B/Br)
,ggt.
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.