C24" (P0351), "C25" (P0352), "C26" (P0353) Or "C27" (P0354) Ignition System Malfunction - Suzuki GSX-R750 Service Manual

4-66 FI SYSTEM DIAGNOSIS
Step 2
1) Connect the TO sensor coupler and ECM coupler.
2) Insert the needle pointed probes to the lead wire coupler.
3) Turn the ignition switch ON.
4) Measure the voltage between B and B/Br wires.
 TO sensor voltage (Normal): 0.4 – 1.4 V
Also, measure the voltage as the motorcycle is leaned.
5) Dismount the TO sensor from its bracket and 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 pointed probe set
 Tester knob indication: Voltage ()
Is the voltage OK?
• R, B or B/Br wire open or shorted to ground, or
poor A, L or S 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.

When using the multi-circuit tester, do not storongly
touch the terminal of the ECM coupler with a needle
pointed tester probe to prevent the terminal damage
or terminal bend.
6) After repairing the trouble, clear the DTC using SDS tool.
(4-27)
"C24" (P0351), "C25" (P0352), "C26" (P0353) or "C27" (P0354) IGNITION
SYSTEM MALFUNCTION
* Refer to the IGNITION SYSTEM for details. (9-20)
(+ B – - B/Br)
(+ B – - B/Br)
2
2
65˚
2
ECM couplers (Harness side)
(Black)
V
V
(Gray)