Open Air Temperature Sensor System Inspection; Hazard Switch Diode - Honda GL1800 Service Manual

HAZARD SWITCH DIODE

Remove the seat (page 2-5).
Remove the hazard switch diode from the wire
harness.
Check for continuity between the diode terminals.
When there is continuity, a small resistance value
will register.
If there is continuity in one direction, the diode is
normal.
OPEN AIR TEMPERATURE SENSOR
SYSTEM INSPECTION
Remove the top shelter (page 2-11).
Disconnect the open air temperature sensor 2P
white connector.
1. Turn the ignition switch to "ON" and measure
the voltage between the Yellow/blue (+) and
Green/black wire terminal of the wire harness
side sensor connector.
There should be approximately 5 V.
• If there is approximately 5 V, go to step 2.
• if there is no voltage, check for an open circuit
in the Yellow/blue and Green/black wires
between the sensor and combination meter
connectors.
2. Turn the ignition switch to "OFF" and measure
the resistance between the sensor side connec-
tor terminals.
Ambient temperature Resistance
– 5° C (23° F) Approx. 21 kΩ
0° C (32° F) Approx. 16 kΩ
10° C (50° F) Approx. 10 kΩ
20° C (68° F) Approx. 6 kΩ
30° C (86° F) Approx. 4 kΩ
40° C (104° F) Approx. 2.5 kΩ
LIGHTS/METERS/SWITCHES
(+)
( )
IO E
IR TEMPER TURE
SENSOR CONNECTOR
IRE HARNESS SIDE
SENSOR CONNECTOR
(viewed from the terminal side)
Yellow/blue Green/black
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