Toyota 4-Runner 1985 Repair Manual page 188

EFI SYSTEM - Troubleshooting
FI-19
CHECK DIAGNOSIS SYSTEM
Check for output of diagnostic code.
(See page F 1-22)
~
Normal code
CHECK IGNITION TIMING
STO:
5°
BTOC at idle
(T - El Short Circuit)
10K
CHECK COLD START INJECTOR
(See page FI-47)
1
0K
CHECK INJECTORS
10K
CHECK SPARK PLUGS AND PLUG
CORDS
Olug gap:
0.8 mm (0.031 in. )
OTE:
SYMPTOM - MUFFLER EXPLOSION (AFTER FIRE)
-Rich Air Fuel Mixture-Misfire
Diagnostic code(s) (See page FI-25)
Malfunction
code
Adjust ignition timing
BAD
1 .
Cold start injector
BAD
2. Cold start injector time switch
(See page F 1-67)
BAD
1
Injectors - Leakage
1. Spark plugs and plug cords
BAD
2. Compression pressure
Limit:
10.0
kg/cm2
(142
psi,
981
kPa)
at
250
rpm
I
Check compression pressure if necessary.
~OK
CHECK EFI ELECTRONIC CIRCUIT
1. Throttle position sensor
USING VOLT/OHMMETER
BAD
2. Injection signal
(1)
Fuel cut signal
(2) Injector wiring
(3) Resistor
(4) ECU
3. Ox sensor