Honda CBR650F Service Manual page 393

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LIGHTS/METERS/SWITCHES
FAN CONTROL RELAY
CIRCUIT INSPECTION
For relay inspection (page 21-23).
Remove the fan control relay (page 21-23).
RELAY SWITCH/COIL POWER INPUT LINE
Measure the voltage between the relay terminal (switch
power input line) of the relay box [1] and ground.
CONNECTION: B (+) – Ground (–)
There should be battery voltage at all times.
If there is no voltage, check the following:
– Red/white wire between the relay box and fuse box
2 for open circuit
– FAN (10 A) fuse
Measure the voltage between the relay terminal (coil
power input line) of the relay box [1] and ground.
CONNECTION: D (+) – Ground (–)
There should be battery voltage when the ignition
switch is turned ON with the engine stop switch " ".
If there is no voltage, check the following:
– Black/white wire in the relay box between the main
and fan control relays for open circuit
– Main relay and its circuit (page 4-41)
SIGNAL LINE
Disconnect the ECM 33P (Black) connector (page 4-
35).
Check for continuity between the relay box [1] and wire
harness side ECM 33P (Black) connector [2] terminals.
TOOL:
Test probe
CONNECTION: C – Green/black
There should be continuity.
If there is continuity, check for open circuit in the Green/
black wire between the relay box and ECM.
Check for continuity between the fuel pump relay
terminal of the relay box [1] and ground.
CONNECTION: C – Ground
There should be no continuity.
If there is continuity, check for short circuit in the Green/
black wire between the relay box and ECM.
If all of above inspections are normal, check for open
circuit in the Black/blue (A) wire between the relay box
and fan motor.
21-24
07ZAJ-RDJA110
[1]
B (R/W)
A
C
D (Bl/W)
G/Bl
[1]
A
B
D
C (G/Bl)
[2]