Yamaha XT660R S Service Manual

7 - 9
FI
FUEL INJECTION SYSTEM
EAS00906
Diagnostic monitoring code table
Fault
code No.
Symptom Probable cause of malfunction Diagnostic code
12
No normal signals are received from
the crankshaft position sensor.
• Open or short circuit in wire harness
• Defective crankshaft position sensor
• Disconnected crankshaft position sensor coupler
• Malfunction in A.C. magneto rotor
• Malfunction in ECU
• Improperly installed crankshaft position sensor
—
13
Open or short circuit is detected in the
intake air pressure sensor.
• Open or short circuit in wire harness
• Defective intake air pressure sensor
• Disconnected intake air pressure sensor coupler
• Malfunction in ECU
03
14
Faulty intake air pressure sensor
hose system.
• detected hose
• clogged hose
• Disconnected, clogged, kinked, or pinched intake air
pressure sensor hose
• Defective intake air pressure sensor
• Malfunction in ECU
03
15
Open or short circuit is detected in the
throttle position sensor.
• Open or short circuit in wire harness
• Defective throttle position sensor
• Disconnected throttle position sensor coupler
• Malfunction in ECU
• Improperly installed throttle position sensor
01
16
Stuck throttle position sensor is
detected.
• Stuck throttle position sensor
• Improperly installed throttle position sensor
• Malfunction in ECU
01
19
Open circuit in the input line (blue/
black lead) of ECU is detected when
the start switch is pushed.
• Open circuit in wire harness (ECU coupler)
• Malfunction in ECU 20
21
Open or short circuit is detected in the
coolant temperature sensor.
• Open or short circuit in wire harness
• Defective coolant temperature sensor
• Disconnected coolant temperature sensor coupler
• Malfunction in ECU
• Improperly installed coolant temperature sensor
06
22
Open or short circuit is detected in the
intake air temperature sensor.
• Open or short circuit in wire harness
• Defective intake air temperature sensor
• Disconnected intake air temperature sensor coupler
• Malfunction in ECU
• Improperly installed intake air temperature sensor
05
30
The motorcycle has overturned. • Overturned motorcycle
• Malfunction in ECU
08
33
Open circuit is detected in the primary
lead of the ignition coil.
• Open circuit in wire harness
• Malfunction in ignition coil
• Malfunction in ECU
• Malfunction in a component of ignition cut-off circuit sys-
tem
30
41
Open or short circuit is detected in the
lean angle cut-off switch.
• Open or short circuit in wire harness
• Defective lean angle cut-off switch
• Disconnected lean angle cut-off switch coupler
• Malfunction in ECU
08
42
No normal signals are received from
the speed sensor or an open or short
circuit is detected in the neutral
switch.
• Open or short circuit in wire harness
• Defective speed sensor
• Disconnected speed sensor coupler
• Malfunction in vehicle speed sensor detected unit
• Defective neutral switch
• Disconnected neutral switch connector
• Malfunction in the engine side of the neutral switch
• Malfunction in ECU
07
21
43
Power supply to the injector and fuel
pump is not normal. (The ECU is
unable to monitor the battery voltage.)
• Open circuit in wire harness
• Malfunction in ECU
• Defective fuel injection system relay
09, 50

Yamaha XT660R S Specifications

General

Displacement	660 cc
Bore x Stroke	100.0 mm x 84.0 mm
Compression Ratio	10.0:1
Fuel System	Fuel Injection
Ignition System	TCI
Starter System	Electric
Transmission System	5-speed
Final Drive	Chain
Front Suspension System	Telescopic forks
Front Tyre	90/90-21 M/C 54S
Rear Tyre	130/80-17 M/C 65S
Overall Width	865 mm
Overall Height	1, 230 mm
Seat Height	865 mm
Wheelbase	1, 505 mm
Wet Weight	181 kg
Fuel Tank Capacity	15 litres
Oil Tank Capacity	2.9 litres
Engine Type	Liquid-cooled, 4-stroke, single cylinder, SOHC
Maximum Power	48hp (35kW) @ 6, 000rpm
Frame	Steel diamond
Rear Suspension System	Swingarm, (link suspension)
Front Brake	Single 298mm disc, 2-piston caliper
Rear Brake	Single Disc, 245 mm