Suzuki Boulevard M50 User Manual

5-42 FI SYSTEM
“C15” (P0115-H/L) ECT SENSOR CIRCUIT MALFUNCTION
INSPECTION
Step 1 (When indicating C15:)
1) Remove the fuel tank. (6-3)
2) Turn the ignition switch OFF.
3) Check the ECT sensor coupler for loose or poor contacts.
If OK, then measure the ECT sensor voltage at the wire side
coupler.
4) Disconnect the ECT sensor coupler and turn the ignition
switch ON.
5) Measure the voltage between B/Bl wire terminal 1 and
ground.
6) Also, measure the voltage between B/Bl wire terminal 1 and
B/Br wire terminal 2.
 ECT sensor input voltage: 4.5 – 5.5 V
(+ B/Bl – - Ground)
(+ B/Bl – - B/Br)
 09900-25008: Multi-circuit tester set
 Tester knob indication: Voltage ()
Is the voltage OK?
DETECTED CONDITION POSSIBLE CAUSE
C15 Output voltage is not within the following
range.
0.1 Sensor voltage < 4.6 V
• ECT sensor circuit open or short
• ECT sensor malfunction
• ECM malfunction
P0115
H
Sensor voltage is higher than specified
value.
• ECT sensor circuit open or ground circuit open
• ECT sensor circuit shorted to ground
L
Sensor voltage is lower than specified
value.
ECM
E2
ECT
ECT sensor
B/BI
B/Br
YES Go to Step 2.
NO
• Loose or poor contacts on the ECM coupler
(terminal D or I)
• Open or short circuit in the B/Bl wire or B/Br
wire
1
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)