Toyota 4A-FE Repair Manual page 87

Fl-16 EFI SYSTEM - Troubleshooting
!
OK CONTINUED FROM PAGE Fl-15
CHECK FUEL SUPPL V TO INJECTOR
1. Fuel in tank
2. Fuel pressure in fuel line
{1)
Connect terminals
+B
and
FP
of the
check connector.
(2) Fuel pressure at fuel hose of fuel
filter can be felt. (See page Fl-95)
1
OK
(w/ AIR FLOW METER)
CHECK FUEL PUMP SWITCH IN AIR
FLOW METER
Check continuity between terminals
FC
and E1 while measuring plate of arr flow
meter is open.
CHECK SPARK PLUGS
-- -----------~
,_____ _ __ _ _ __, 1. Fuel line - Leakage - deformation
BAD 2 . Fuse
3 . Circuit opening relay {See page Fl-135)
4. Fuel pump (See page Fl-94)
5. Fuel filter
6. Fuel pressure regulator
(See page Fl-109)
I
- - - _... Air flow meter (See page Fl-120)
BAD
1 . Spark plugs
Standard: 0.8 mm [0.031 in.) NO
2 . Compression pressure
Minimum: 10.0 kg/cm 2 HINT: Check compression pressure and
valve clearance if necessary.
CHECK AUXILIARY AIR VALVE
(See page Fl-130)
CHECK INTAKE VALVE
CHECK EFI ELECTRONIC CIRCUIT
USING VOLT/OHMMETER
{See page Fl-34)
(142 psi, 981 kPa)
at 250 rpm
3. Valve clearance {Cold}
Standard: IN 0.15 - 0.25 mm
(0.006 - 0.010 in.)
EX 0.20 - 0.30 mm
(0.008 - 0.001 2 in.)
_ _ _ _ ___, 1. Injectors - shorted or leaking
BAD
(
ALL\
Plugs}
WET
BAD
2. Injector wiring - short circuited
3. Cold start injector - leakage
(See page Fl-105)
4. Start injector time switch
(See page Fl-137)
1. Auxiliary air valve
2. Water by-pass hose(s)
3. Air hose(s)
BAD
Intake valve - carbon deposits
,___ _ _ _ -----< __ ,
1 . Wiring connection{s)
BAD 2. Power to ECU
(1)
Fusible link{s)
(2)
Fuse(s)
(3) EFI main relay
3 . Air flow meter (w/ Air flow meter)
4 . Vacuum sensor (w/o Air flow meter)
5. Water temp. sensor
6. Intake air temp. sensor
7. Injection signal circuit
(1) Injector wiring
(2) ECU