High Engine Idle Speed (No Drop) - Toyota 3F-E Repair Manual Supplement

FI-16
ACCELERATOR LINKAGE
CHECK
AIR CONDITIONER IDLE-UP
CHECK
CIRCUIT
CHECK DIAGNOSIS SYSTEM
Check for output of diagnostic code.
(See page FI-21)
Normal code
CHECK ISC SYSTEM
OK
CHECK THROTTLE POSITION SENSOR
(See page FI-64)
OK
CHECK FUEL PRESSURE
(See page FI-45)
OK
CHECK COLD START INJECTOR
(See page FI-50)
OK
CHECK INJECTORS (See page FI-55)
OK
V
CHECK EFI ELECTRONIC CIRCUIT
USING VOLT/OHMMETER
(See page FI-27)
EFI SYSTEM — Troubleshooting
SYMPTOM - HIGH ENGINE IDLE SPEED (NO DROP)
BAD
BAD
Malfunction
code(s)
BAD
BAD
BAD
BAD
BAD
BAD
Linkage — Stuck
ISC valve
Diagnostic code(s) (See pages FI-24, 25)
1. Wiring connections
2. ISC valve (See page FI-67)
3. Air conditioner switch
Throttle body
Fuel pressure regulator — High pressure
Cold start injector — linkage
Injectors — Leakage, Injection quantity
1. Wiring connection
2. Power to ECU
(1) Fusible links
(2) Fuses
(3) EFI main relay (See page FI-70)
3. Air flow meter (See page FI-62)
4. Water temp. sensor (See page FI-73)
5. Air temp. sensor (See page FI-62)
6. Injection signal circuit
(1) Injector wiring
(2) ECU (See page FI-77)