Suzuki TU250X Service Manual page 160

6) Disconnect the ECM coupler.
7) Check the continuity between V wire A and terminal 3.
8) Also, check the continuity between R wire B and terminal A.
 TP sensor lead wire continuity: Continuity ()
 09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set
 Tester knob indication: Continuity test ()
Is the continuity OK?
YES Go to Step 1 (4-36) and go to Step 2.
NO R wire or V wire open, or V wire shorted to ground
Step 2
1) Connect the special tool between TP sensor and its coupler.
2) Warm up the engine and keep it running at idling speed.
3) Measure the TP sensor output voltage at the terminals
(between + V and - B/Br).
NOTE:
When measure the TP sensor output voltage, make sure that
the fast idle cam is not contacted to the throttle lever.
4) Turn OFF the ignition switch and ON again.
5) Measure the TP sensor output voltage at the terminals
(between + V and - B/Br) by turning the throttle grip.
 TP sensor output voltage
Throttle valve is closed: Approx. 0.6 V
Throttle valve is opened: Approx. 3.8 V
 09900-25008: Multi circuit tester set
09900-28630: TP Sensor test lead
 Tester knob indication: Voltage ()
Is the voltage OK?
• V, R or B/Br wire open or shorted to ground, or
poor 3, A or T connection
• If wire and connection are OK, intermittent trou-
ble or faulty ECM.
YES
• Recheck each terminal and wire harness for
open circuit and poor connection.
• Replace the ECM with a known good one, and
inspect it again.
• Short circuit in the V wire.
NO • If check result is not satisfactory, replace TP
sensor with a new one.
FI SYSTEM DIAGNOSIS 4-39
1
ECM coupler (Harness side)
2
2
V
R
TPS
B/Br
2
ECM coupler (Harness side)
!
ECM