Suzuki Boulevard M50 User Manual

5-52 FI SYSTEM
“C23” (P1651-H/L) TO SENSOR CIRCUIT MALFUNCTION
INSPECTION
Step 1 (When indicating C23:)
1) Remove the right frame cover. (8-4)
2) Turn the ignition switch OFF.
3) Check the TO sensor coupler for loose or poor contacts.
If OK, then measure the TO sensor resistance.
4) Disconnect the TO sensor coupler.
5) Measure the resistance between terminal A and terminal C.
 TO sensor resistance: 19.1 – 19.7 kΩ
(Terminal A – Terminal C)
 09900-25008: Multi-circuit tester set
 Tester knob indication: Resistance (Ω)
Is the resistance OK?
DETECTED CONDITION POSSIBLE CAUSE
C23 The sensor voltage should be the follow-
ing for 2 sec. and more, after ignition
switch is turned ON.
0.2 Sensor voltage < 4.6 V
• TO sensor circuit open or short
• TO sensor malfunction
• ECM malfunction
P1651
H
Sensor voltage is higher than specified
value.
• TO sensor circuit open or shorted to VCC or
ground circuit open
• TO sensor circuit shorted to ground or VCC circuit
open
L
Sensor voltage is lower than specified
value.
ECM
Br/W
E2
TOS
R
B/Br
VCC
TO SENSOR
1
YES Go to Step 2.
NO Replace the TO sensor with a new one.
1
SAMPLE

Suzuki Boulevard M50 Specifications

General

Compression Ratio	9.4:1
Fuel System	Fuel injection
Ignition	Electronic ignition (transistorized)
Transmission	5-speed constant mesh
Final Drive	Shaft drive
Front Suspension	Inverted telescopic, coil spring, oil damped
Front Tire	130/90-16M/C 67H, tubeless
Rear Tire	170/80-15M/C 77H, tubeless
Ground Clearance	140 mm (5.5 in)
Seat Height	700 mm (27.6 in)
Engine Type	4-stroke, liquid-cooled, V-twin
Bore x Stroke	83.0 mm x 74.4 mm
Rear Suspension	coil spring, oil damped
Front Brakes	Single hydraulic disc
Rear Brakes	Drum
Fuel Tank Capacity	15.5 L (4.1 US gal)
Wheelbase	1, 655 mm (65.2 in)