Service Repair Manual

GENERAL (FBC)
Carburetor and FBC System
Symptom
Engine will not start
or start to hard
Rough idle or engine
stalls
Carburetor
FBC system
Carburetor
FBC system
Probable cause
Choke valve remains open-cold engine
Improper choke breaker operation
Electric choke malfunction
Needle valve sticking or clogged
Engine coolant temperature sensor
malfunction
Vacuum hose disconnected or damaged
Slow-cut solenoid valve malfunction
Feedback solenoid valve malfunction
Vacuum switch malfunction-cold engine
Faulty ECU
Harness broken/short-circuited or
loose connection
Choke valve malfunction
Improper fast idle-cold engine
Improper idle adjustment
Electric choke malfunction
Primary pilot jet clogged
Dash pot malfunction
Slow-cut solenoid valve malfunction
Engine coolant temperature sensor
malfunction
Vacuum hose disconnected or damaged
Throttle position sensor malfunction
Engine speed sensor malfunction
Timing control system malfunction
Throttle opener control system
malfunction
Harness broken/short-circuited or
connector not connected securely
Remedy
Clean choke bore and linkage
Check and adjust choke breaker
Check electric choke body and
choke valve operation
Repair or replace
Check by using checker (Check
component and replace if faulty)
Repair or replace
Check component
Check component
Check component
Replace
Repair or replace
Clean choke bore and link
Adjust fast idle speed
Adjust idle speed
Check choke body and choke
valve operation
Clean up or replace
Adjust
Check drive signal by using
checker
Check component
Check by using checker (Check
component and replace if faulty)
Repair or replace
Check component and adjust
Check by using checker
Check harness for continuity
Check system. If faulty, check
components
Check system. If faulty, check
components
Repair or replace
31-77