24" (P0351) Ignition System Malfunction - Suzuki TU250X Service Manual

4-52 FI SYSTEM DIAGNOSIS
Step 2
1) Remove the TO sensor. (4-71)
2) Connect the TO sensor coupler and ECM coupler.
3) Insert the needle-point probes to the lead wire coupler.
4) Turn the ignition switch ON.
5) Measure the voltage at the wire side coupler between Br and
B/Br wires.
 TO sensor voltage (Normal): 0.4 – 1.4 V
6) Also, measure the voltage when leaning the motorcycle.
7) Measure the voltage when it is leaned 65° and more, left and
right, from the horizontal level.
 TO sensor voltage (Leaning): 3.7 – 4.4 V
 09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set
 Tester knob indication: Voltage ()
Is the voltage OK?
• R, Br or B/Br wire open or shorted to ground, or
poor 4, 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.
• Loose or poor contacts on the ECM coupler
NO • Open or short circuit
• Replace the TO sensor with a new one.

"24" (P0351) IGNITION SYSTEM MALFUNCTION

* Refer to the IGNITION SYSTEM for details. (9-22)
NOTE:
After repairing the trouble, clear the DTC using SDS tool. (4-24)
(+ Br – - B/Br)
(+ Br – - B/Br)
2
V
2
V
2
ECM coupler (Harness side)