If the radiator fan relay is normal, check the wiring for continuity, using the wiring diagram in this section.
Special Tool - Hand Tester: 57001-1394
If the wiring is good, check the ECU for its ground and power supply (see ECU Power Supply Inspection in the Fuel System (DFI) chapter).
If the ground and power supply are good, replace the ECU (see ECU Removal/Installation in the Fuel System (DFI) chapter).
Radiator Fan Circuit

1. ECU
2. Fan Motor
3. Ignition Switch
4. Joint Connector F
5. Fuse Box 1
6. Ignition Fuse 15 A
7. Relay Box
8. Fan Relay
9. Frame Ground 3
10. Fuse Box 2
11. Fan Fuse 15 A
12. Starter Relay
13. Main Fuse 30 A
14. Battery
15. Engine Ground
Radiator Fan Relay Removal/InstallationRear Wheel Rotation Sensor Signal Abnormal (Service Code b 44)
Measure the air gap between the rear wheel rotation sensor
and sensor rotor.
Thickness Gauge [A]
Air Gap
Standard: 0.4 1.6 mm (0.02
0.06 in.)
If the measurement is not the standard, check each part
for deformation and looseness and correct accordingly.
If the measurement is the sta ...
Valve Clearance Adjustment
To change the valve clearance, remove the camshafts
(see Camshaft Removal in the Engine Top End chapter)
and valve lifters.
Replace the shim with one of a different thickness.
NOTE
Mark and record the locations of the valve lifters and
shims so that they can be reinstalled in their ...
Kawasaki Clean Air System
The Kawasaki Clean Air System
(KCA) is a secondary air suction system
that helps the exhaust gases to
burn more completely. When the spent
fuel charge is released into the exhaust
system, it is still hot enough to
burn. The KCA System allows extra
air into the exhaust system so that the
spen ...