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15-74 ELECTRICAL SYSTEM
Carburetor Heater (Other than United States, Canada and Taiwan)
At times, the temperature of the carburetor could be too low for efficient atomization of fuel, such as
immediately after the engine has been started or when the ambient temperature is low. Under these
conditions, the electric carburetor heater electrically heats the carburetor to prevent the engine from
stalling.
Outline
To activate the carburetor heater, the (stopped) engine must first be started. Then, the PTC (Positive
Temperature Coefficient) sensor detects the temperature of the carburetor body, and this signal is
sent to the control unit. When the atmospheric temperature sensor is ON, the control unit turns the
carburetor heater relay ON or OFF in accordance with the signals sent by the igniter and the PTC
sensor. As a result, the carburetor heater operates or stops operating depending on whether the
relay is t urned ON or OFF.
Carburetor Heater Circuit
1. Ignition Switch
2. Horn Fuse 10 A
3. Accessory Fuse 10 A
4. Atmospheric Temperature Sensor
5. PTC Sensor (Carburetor Temperature Sensor)
6. Carburetor Heater
7. Carburetor Heater Control Unit
8. Normal Open Type Relay
9. Main Fuse 30 A
10. Battery
11. IC Igniter
Carburetor Heater Inspection
Disconnect the connector [A] from the carburetor heater
lead.
Set the hand tester to the × 1 range, and measure the
resistance between the carburetor heater terminal and
the carburetor body.
Carburetor Heater Resistance
Standard: 7 12
394


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