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Thermo Switch

See FUEL EVAPORATIVE EMISSION CONTROL SYSTEM  .

CARBURETOR FEEDBACK SYSTEM OPERATION - BELOW 45°F (7°C)

Application Specification
TVSV Open (J-L)
Condition N/A
Engine RPM N/A
TPS N/A
Vacuum Switch Off
Air Fuel Ratio in the Exhaust Manifold N/A
Ox Sensor Signal N/A
Computer Off
EBCV Closed
Air Bleed Off
CARBURETOR FEEDBACK SYSTEM OPERATION - ABOVE 63°F (17°C) & IDLING

Application Specification
TVSV Open (K-L)
Engine RPM Below 1000 RPM
TPS N/A
Vacuum Switch Off
Air Fuel Ratio in the Exhaust Manifold N/A
Ox Sensor Signal N/A
Computer Off
EBCV Closed
Air Bleed Off
CARBURETOR FEEDBACK SYSTEM OPERATION - ABOVE 63°F (17°C) & CRUISING

Application Specification
Between 1500 RPM and 4100 RPM
TVSV Open (K-L)
TPS On
Vacuum Switch On
Air Fuel Ratio in the Exhaust Manifold Rich/Lean
Ox Sensor Signal Rich/Lean
Computer On/Off
EBCV Open/Closed
Air Bleed Feedback Air Bleed
Above 4500 RPM
TVSV Open (K-L)
TPS N/A
Vacuum Switch N/A
Air Fuel Ratio in the Exhaust Manifold N/A
Ox Sensor Signal N/A
Computer Off
EBCV Closed
Air Bleed Off
Heavy Loads (1)
TVSV Open (K-L)
Engine RPM N/A
TPS On
Vacuum Switch Off
Air Fuel Ratio in the Exhaust Manifold N/A
Ox Sensor Signal N/A
Computer Off
EBCV Closed
Air Bleed Off
Deceleration, Above 1500 RPM
TVSV Open (K-L)
TPS Off
Vacuum Switch On
Air Fuel Ratio in the Exhaust Manifold N/A
Ox Sensor Signal N/A
Computer On
EBCV Open
Air Bleed On
(1) With intake vacuum below 3.35 in Hg.
EVAP SYSTEM OPERATION

Application Specification
Ignition Switch Off (1)
Coolant Temp. N/A
Thermo Temp. N/A
Engine RPM N/A
Throttle Position Switch N/A
VSV N/A
Canister Check Valve (1) N/A
Canister Check Valve (2) N/A
Check Valve in Fuel Filler Cap N/A
Evaporation Fuel (HC) . HC from tank and float chamber is absorbed into the canister
Ignition Switch On (2)
Coolant Temp. Below 109°F (43°C)
Thermo Temp. On
Engine RPM N/A
Throttle Position Switch Off
VSV Off
Canister Check Valve (1) N/A
Canister Check Valve (2) N/A
Check Valve in Fuel Filler Cap N/A
Evaporation Fuel (HC) HC from tank is absorbed into canister
Ignition Switch On (2)
Coolant Temp. N/A
Thermo Temp. On
Engine RPM Below 1000 RPM
Throttle Position Switch N/A
VSV Off
Canister Check Valve (1) N/A
Canister Check Valve (2) N/A
Check Valve in Fuel Filler Cap N/A
Evaporation Fuel (HC) HC from tank is absorbed into canister
Ignition Switch On (2)
Coolant Temp. Above 131°F (55°C)
Thermo Temp. Off
Engine RPM Above 1900 RPM
Throttle Position Switch Off
VSV Off
Canister Check Valve (1) N/A
Canister Check Valve (2) N/A
Check Valve in Fuel Filler Cap N/A
Evaporation Fuel (HC) HC from tank is absorbed into canister
Ignition Switch On (2)
Coolant Temp. N/A
Thermo Temp. N/A
Engine RPM Above 1500 RPM
Throttle Position Switch On
VSV On
Canister Check Valve (1) N/A
Canister Check Valve (2) N/A
Check Valve in Fuel Filler Cap N/A
Evaporation Fuel (HC) HC from canister is led into intake manifold
High pressure in tank
Coolant Temp. N/A
Thermo Temp. N/A
Engine RPM N/A
Throttle Position Switch N/A
VSV N/A
Canister Check Valve (1) Open
Canister Check Valve (2) Closed
Check Valve in Fuel Filler Cap Closed
Evaporation Fuel (HC) HC from tank is absorbed into canister
High vacuum in tank
Coolant Temp. N/A
Thermo Temp. N/A
Engine RPM N/A
Throttle Position Switch N/A
VSV N/A
Canister Check Valve (1) Closed
Canister Check Valve (2) Open
Check Valve in Fuel Filler Cap Open
Evaporation Fuel (HC) Air is led into tank
(1) With outer vent control valve open.
(2) With outer vent control valve closed.
DECELERATION FUEL CUT-OFF-TO-RPM SPECIFICATIONS

Engine Condition Less Than 1900 RPM More Than 2290 RPM More Than 2290 RPM
Vacuum in the Vacuum Switch N/A Less Than 7.09 in. Hg More Than 8.46 in. Hg
Vacuum Switch "A" N/A On Off
Computer On On Off
Primary Fuel Cut Solenoid Valve On On Off
Slow Circuit in Carburetor Open Open Closed
DECELERATION FUEL CUT-OFF SYSTEM OPERATION

Application Specification
Ignition Switch Off
Engine Not Running
Coolant Temp N/A
Thermo Switch N/A
ECM N/A
CMH Relay Off
CMH Off
Ignition Switch On
Engine Not Running
Coolant Temp N/A
Thermo Switch N/A
ECM Off
CMH Relay Off
CMH Off
Ignition Switch On
Engine Running
Coolant Temp Below 109°F (43°C)
Thermo Switch On
ECM On
CMH Relay On
CMH On (Heated)
Ignition Switch On
Engine Running
Coolant Temp Above 131°F (55°C)
Thermo Switch Off
ECM Off
CMH Relay Off
CMH Off
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