C14" (P0120-H/L) Tp Sensor Circuit Malfunction - Suzuki VZR1800 2007 Service Manual

"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
P0120
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 OFF.
2) Remove the fuel tank. (#6-3)
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 Red wire B and ground.
7) If OK, then 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 A or S).
NO
• Open or short circuit in the Red wire or B/Br
wire.
• TP sensor maladjusted
• TP sensor circuit open or short
• TP sensor malfunction
• ECM malfunction
• TP sensor circuit shorted to VCC or ground circuit
• TP sensor circuit open or shorted to ground or
R
P/B
B/Br
(+ Red – - Ground)
(+ Red – - B/Br)
POSSIBLE CAUSE
open
VCC circuit open
1
1
FI SYSTEM DIAGNOSIS 5-41
ECM
VCC
TP
E2
V