SYMPTOM - HIGH ENGINE IDLE SPEED (NO DROP)
CHECK
Linkage — Stuck
ACCELERATOR LINKAGE
BAD
CHECK
CIRCUIT
AIR CONDITIONER IDLE-UP
ISC valve
BAD
CHECK DIAGNOSIS SYSTEM
Check for output of diagnostic code.
(See page FI-21)
Diagnostic code(s) (See pages FI-24, 25)
Malfunction
code(s)
Normal code
CHECK ISC SYSTEM
1. Wiring connections
2. ISC valve (See page FI-67)
3. Air conditioner switch
BAD
OK
CHECK THROTTLE POSITION SENSOR
(See page FI-64)
Throttle body
BAD
OK
CHECK FUEL PRESSURE
(See page FI-45)
Fuel pressure regulator — High pressure
BAD
OK
CHECK COLD START INJECTOR
(See page FI-50)
Cold start injector — linkage
BAD
OK
CHECK INJECTORS (See page FI-55)
Injectors — Leakage, Injection quantity
BAD
OK
V
CHECK EFI ELECTRONIC CIRCUIT
USING VOLT/OHMMETER
(See page FI-27)
1. Wiring connection
BAD
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)
EFI SYSTEM — Troubleshooting
FI-16
Summary of Contents for 3F-E
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