Toyota 4-Runner 1985 Repair Manual page 183

FI-14
EFI SYSTEM - Troubleshooting
~
OK
CONTINUED FROM PAGE FI-13
I
CHECK AIR VALVE
1. Air valve (See page FI-5S)
1. Disconnect air hose from air valve. BAD
2. Water hoses
2. Check that air valve opens when cold. 3. Air hoses
Room temp.: Below
20°C (68
0
F)
~
OK
RECHECK FUEL PRESSURE
1. Fuel pump (See page FI-42)
(See page F 1-42)
BAD 2. Fuel filter
3. Fuel pressure regulator
(See page F 1-49)
~
OK
CHECK INJECTORS
Injection condition
(See page F I-50) BAD
i
OK
CHECK EFI ELECTRONIC CIRCUIT
~ 1 . Wiring connection
-
USING VOLT/OHMMETER
BAD 2. Power to ECU
( 1) Fusible link
(2) Main relay
3. Air flow meter
4. Water thermo sensor
5. Injection signal
(1) Injector wiring
I
(2) Resistor
(3) ECU
SYMPTOM - ENGINE SOMETIMES STALLS
CHECK DIAGNOSIS SYSTEM Diagnostic code(s) (See page F 1-25)
Check for output of diagnostic code. Malfunction
(See page F 1-22) code
~
Normal code
CHECK AIR FLOW METER
Air flow meter
(See page F I-56) BAD
~
OK
CHECK WIRING CONNECTORS AND
1. Connector
RELAYS
BAD 2. Main relay (See page FI-64)
Check that there is a signal change when the
3. Circuit opening relay (See page FI-65)
connector or relay is slightly tapped or wiggled.