Service Repair Manual

SERVICE ADJUSTMENT PROCEDURES (FBC)
INSPECTION OF CHOKE BREAKER SYSTEM
o Check conditions of the choke valve according to procedures given in the table below.
Engine coolant
temperature
Lower than
10°C (50°F)
Lower than
10°C (50°F)
Checking condition
Normal choke valve operation
Probable cause of trouble
Before engine start Closes fully
Start engine and run idle
(fully depress accelerator
pedal and then start)
Opens slowly and slightly
(immediately after starting)
[gap approx. 1.5 mm (0.059
in.)]
Faulty bimetal assembly
of linkage operation
o Clogged delay valve
o Broken diaphragm
(chamber A)
Disconnect vacuum hose
(yellow stripe) from choke
breaker during idling
Stationary
o Faulty thermo valve
Step
1
2
3
Lower than
10°C (50°F)
4 Higher than
25°C (77°F)
Connect
vacuum
hose
(yellow stripe) and run
engine idle
When closed lightly with
finger, stops at larger opening
than step 2 [gap approx. 3 mm
(0.118 in.)]
o Faulty thermo valve
o Broken diaphragm
(chamber B)
31-101