C13" Lap Sensor Circuit Malfunction - Suzuki GSX-R1000 Service Manual

4·30 FI SYSTEM DIAGNOSIS
"C13" lAP SENSOR CIRCUIT MALFUNCTION
DETECTED CONDITION POSSIBLE CAUSE
lAP sensor voltage low or high. • Clogged vacuum passage between throttle body
0.5 V
~
Sensor voltage < 4.85 V and lAP sensor.
(without the above range.) • Air being drawn from vacuum passage between
NOTE:
throttle body and lAP sensor.
Note that atmospheric pressure varies depending on
•
lAP sensor circuit open or shorted to ground .
weather conditions
as
well
as
altitude.
•
lAP sensor malfunction .
Take that into consideration when inspecting volt- •
ECM malfunction.
age.
INSPECTION
Step 1
1) Lift and support the fuel tank with its prop stay.
(C75-5)
2) Turn the ignition switch OFF.
3) Check the lAP sensor coupler for loose or poor contacts.
If OK, then measure the lAP sensor input voltage.
4) Disconnect the lAP sensor coupler.
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.
_ lAP sensor input voltage: 4.5 - 5.5 V
(0
Red -
8
Ground)
(0
Red -
8
B/Br)
!T' { %t! 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.