Suzuki VL1500K5 Supplementary Service Manual page 54

"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.
0.1 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) Remove the right frame upper cover.
(!VL1500 Service Manual 6-3)
2) Turn the ignition switch OFF.
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 Red wire B and ground.
7) Also, measure the voltage at the Red wire B and B/Br wire C.
" TP sensor input voltage: 4.5 – 5.5 V
# 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
(terminal 6 or D).
NO
• Open or short circuit in the Red wire or B/Br
wire.
R
BI/B
B/Br
(+ Red – - Ground)
(+ Red – - B/Br)
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.
1
1
VL1500K5 ('05-MODEL) 53
ECM
VCC
TP
E2
V