Toyota 4-Runner 1985 Repair Manual page 180

EFI SYSTEM - Troubleshooting
FI-11
SYMPTON - DIFFICULT TO START OR NO START (CRANKS OK)
... HECK DIAGNOSIS SYSTEM
Check for output of diagnostic code.
(See page F 1-22)
~
Normal code
CHECK FOR VACUUM LEAKS IN AIR
INTAKE LINE
~OK
CHECK IGNITION SPARK
1. Unplug connectors of injector resistor and
start injector time switch.
2. Check by holding spark plug cord 8 - 10 mm
(0.31 - 0.39 in.)away from engine block
while engine is cranking.
A strong spark should be noted.
~OK
CHECK IGNITION TIMING
STD: 5° BTDC at idle
(T - El Short Circuit)
CHECK FUEL SUPPLY TO INJECTOR
1. Fuel in tank
I
2. Fuel pressure in fuel line
(1) Short fuel pump check terminals.
(2) Fuel pressure at fuel hose of cold start
injector can be felt.
(See page FI-43)
~OK
CHECK FUEL PUMP SWITCH IN AIR
FLOW METER
Check continuity between terminals Fc and
El
while measuring plate of air flow meter is open.
CHECK SPARK PLUGS
Plug gap: 0.8 mm (0.031 in.)
NOTE:
Check compression pressure if necessary.
~OK
CONTINUED ON PAGE FI-12
\ - - - - - - - - . 1
Diagnostic code(s) (See page FI-25)
Malfunction
code
~--
_ _ ---' 1. Hose connections
BAD
2. PCV hoses
3. EG R system - EG R valve stays open
~
_ _ _ _ -...I
1. Plug cords
BAD
2. High-tension cords
3. Distributor
4.
Ignition coil, igniter
5.
ECU
~
_ _ _ _ .-.. Adjust ignition timing
NO
\ - - - - - - . . . . . - !
1. Fuel line - Leakage - Deformation
BAD
2. Fuse
3. Circuit opening relay (See page FI-65)
4. Fuel pump (See page F 1-42)
5. Fuel filter
6. Fuel pressure regulator (See page F 1-49)
r---_ _ _ _
~Air
flow meter (See page FI-54)
BAD
~
_ _ _ _ --.I
1. Spark plug
NO
2. Compression pressure
Limit:
10.0
kg/cm2
(142
psi, 981 kPa)
at 250 rpm
3. Injector - Leakage (See page F I-50)
1 - - - - - - . . . - 1
1. I njector(s) - Shorted
[
~~
] 2. Injector wiring between resistor and ECU shorted
Plugs 3. Cold start injector - Leakage (See page FI-47)
Wet 4. Start injector time switch (See page FI-67)