Deceleration Fuel Cut System - Toyota 4-Runner 1985 Repair Manual

EMISSION CONTROL SYSTEMS (CARB.) - Auxiliary Systems
EC-63
6. Deceleration Fuel Cut System
Fuel Cut Solenoid Valve
Fuel
Cut----~~~
Port
A03081
Vacuum S/W
EC0397
Vacuum S/W
,.-_ _ _ _ Engine
Speed
IG Switch
Fuel Cut Port
EC3902
During deceleration this system cuts off part of the fuel in the slow circuit of the carburetor. This prevents overheating
and afterburning in the exhaust system.
Engine RPM
Vacuum in the
Vacuum S/W Computer
Fuel Cut Slow Circuit in
Vacuum S/W Solenoid Valve Carburetor
Low vacuum
below 360 mmHg ON
ON ON OPEN
(14.17 in.Hg, 4.8.0 kPa)
Below 1,810 rpm
High vacuum
above 425 mmHg OFF ON ON OPEN
(16.73 in.Hg, 56.7 kPa)
Low vacuum
below 360 mmHg ON ON ON
OPEN
(14.17 in.Hg, 48.0 kPa)
Above 2,200 rpm
High vacuum
above 425 mmHg OFF OFF OFF CLOSED
(16.73 in.Hg, 56.7 kPa)