Toyota 4A-F, Руководство по ремонту

Страница: 77 / 319

EFI SYSTEM
Troubleshooting
OK CONTINUED FROM
P
A
G
E FI.16
CHECK FUEL PRESSURE
Fuel prllssure regulator
High pressure
!See
pagll FI·67f
CHECK COLD START INJECTOR
Cold start Injector -
L
i
n
k
a
g
e
lSee page
FI·72f
'AD
INJECTORS
I
S
lI
e
pltgll
Fl." ,
Lealage, Injection quantity
'AD
CHECK EFI ELECTRONIC CIRCUIT
1.
Wiring connection
USING VOLT/OHMMETER
'AD
2. Power to fCU
!See
pagll FI-291 1'1 Fusible l i n
k
s
12f fuses
131
Efl
main lelay
3 . Ail lIow metltl' Iwl Air flow metel)
4 .
Vacuum sensor Iw/o Air lIow meter)
5.
Water temp. sensor
6 .
Ai, temp. sensor
'.
l
nj
e
ct
i
on
5191\81
circuit
(11
Injector wiring
(2) Solenoid resistor Iw/o Air lIow meted
131
ECU
SYMPTOM - ENGINE BACKFIRES-Lean Fuel Mixture
CHECK DIAGNOSIS SYSTEM
Diagnostic codels) (See p a
g
e Fl-25 01 261
Ckeck for OtJtput
of diagnostic code.
M a l
f
unc;:t
ion
!See pBge Fl·22) codets)
N
o r
m
a l code
CHECK FOR VACUUM LEAKS IN AIR
1. Oil filler cap
INTAKE LINE
'AD 2. Oil dipstick
3. Hose connections
4.
PCV
hose Is)
5. EGR
svstem
-
EGR velvII stavs open
CHECK IGNITION TIMING
Ignition timing Ad
j
u s
t
1.
Short terminals
T
and
El
of the check NO
!See Pltgll
EM-J')
connector
2.
Check ignitiOn liming.
S
t
.
n
�
r d
:
100
B
T
o
C
@ idle
OK
CHECK IDLE SPEED lAND IDLE CO
I.
Idle
speud Adjust
CONCENTRATION)
NO
2. I
d l e CO concentration
-
Adjust
ISee page
EM·J9
Of 421
CONTINUED ON PAGE fl·IS