Toyota 4A-F Repair Manual page 77

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