C14" (P0120-H/L) Tp Sensor Circuit Malfunction - Suzuki GSX-R750 Service Manual

4-44 FI SYSTEM DIAGNOSIS

"C14" (P0120-H/L) TP SENSOR CIRCUIT MALFUNCTION

DETECTED CONDITION
C14 Output voltage is not within the following
range.
Difference between actual throttle open-
ing and opening calculated by ECM is
larger than specified value.
0.2 V Sensor voltage < 4.8 V
P0120 Sensor voltage is higher than specified
H
value.
Sensor voltage is lower than specified
L
value.
TP sensor
INSPECTION
Step 1 (When indicating C14:)
1) Turn the ignition switch to OFF.
2) Lift and support the fuel tank. (5-3)
3) Check the TP sensor coupler for loose or poor contacts.
If OK, then measure the TP sensor input voltage.
4) Disconnect the TP sensor coupler.
5) Turn the ignition switch ON.
6) Measure the voltage at the R wire B and ground.
7) If OK, then measure the voltage at the R wire B and B/Br
wire C.
POSSIBLE CAUSE
• TP sensor maladjusted
• TP sensor circuit open or short
• TP sensor malfunction
• ECM malfunction
• TP sensor circuit shorted to VCC or ground circuit
open
• TP sensor circuit open or shorted to ground or
VCC circuit open
R
P/B
B/Br
1
ECM
VCC
TP
E2