C22" (P1450-H/L) Ap Sensor Circuit Malfunction - Suzuki GSX-R750 Service Manual

"C22" (P1450-H/L) AP SENSOR CIRCUIT MALFUNCTION

DETECTED CONDITION
C22 AP sensor voltage is not within the fol-
lowing range.
0.5 V Sensor voltage < 4.85 V
NOTE:
Note that atmospheric pressure varies
depending on weather conditions as
well as altitude.
Take that into consideration when
inspecting voltage.
P1450 Sensor voltage is higher than specified
H
value.
Sensor voltage is lower than specified
L
value.
AP sensor
INSPECTION
Step 1 (When indicating C22:)
1) Turn the ignition switch OFF.
2) Remove the front seat. (8-7)
3) Check the AP sensor coupler for loose or poor contacts.
If OK, then measure the AP sensor input voltage.
POSSIBLE CAUSE
• Clogged air passage with dust
• AP sensor circuit open or shorted to ground
• AP sensor malfunction
• ECM malfunction
• AP sensor circuit shorted to VCC or ground circuit
open
• AP sensor circuit open or shorted to ground or
VCC circuit open
G/Y
B/Br
R
1
FI SYSTEM DIAGNOSIS 4-57
ECM
AP
E2
VCC