Coolant Temperature Gauge Inspection; Thermo Sensor Inspection - Honda Motorcycle Service Manual

LIGHTSIMETERSISWITCHES
1. Disconnect the wire from the therrno sensor.
Ground the therrno sensor wire using a jumper wire
Turn the ignition switch ON and check the coolant gauge.
Disconnect the therrno sensor wire from the ground im-
mediately if the gauge needle moves fully t o H.
CAUTION
.
Immediately disconnect the wire from the ground i f the
needle moves to H (hot) to prevent damage to the gauge.
Needle d{es not move ~eedl; moves
I
t
Faulty thermo sensor
2. Check for voltage between the therrno sensor wire and
ground.
I
I
i
No voltage
4
Voltage
I
4
Faulty coolant gauge
3. Check for voltage between the blacklbrown and greenlblue
wires of the gauge.
I
C
NO voltage
t
Voltage
+
t
Broken blacklbrown or
.
Faulty coolant temper-
greenlblue wire ature gauge
THERMO SENSOR INSPECTION
Drain the coolant (see page 5-6).
Disconnect the wire from the therrno sensor and remove it.
Suspend the t h e r m o sensor i n a p a n o f coolant (50-
50rnixture) over an electric heating element and measure the
resistance through the sensor as the coolant heats upSRefer
to the Model specifie manual for the specified resistance.)
1
.
Keep flammable materials awayfrom the electric heating
I
element.
Wear insulated gloves and eye protection.
1
NOTE
.
Soak the thermo sensor in coolant up to its threads with
at least 40 mm (1.57 in) from the bottom of the pan to
the bottom of the sensor.
Keep temperature constant for 3 minutes before testing.
A sudden change of temperature will result in incorrect
readings. Do not let the thermometer or therrno sensor
touch the pan.
Apply sealant to the thermo sensor threads prior t o rein-
stallation.
IGNITION MAIN
FUSE SWITCH FUSE
-
L
BI/Br
I
CONNECTOR
TEMP. GAUGE
-
-
THERMO SENSOR
1
THERMOMETER
Date of Issue: March,
1995
O
HONDA MOTOR CO.,LTD.