7-23
FUEL INJECTION SYSTEM
FI
Battery positive terminal ! red/ black
Battery positive terminal ! light green
1
2
Tester positive probe ! red
Tester negative probe ! red/blue
3
4
Fault code No. 43 Symptom The ECU is unable to monitor the battery voltage.
Used diagnostic code No. 09 (fuel system voltage)
Inspection operation item and probable
cause
Operation item and countermeasure Reinstatement
method
Malfunction in ECU Fuel injection system relay is on.
Reinstated by
Open or short circuit in the wiring harness. Repair or replace if there is an open or short
circuit.
Between starting circuit cut-off relay (fuel injection
system relay), fuel pump, injector (#1 X #4)
Red/Blue – Red /Blue
starting the engine
and operating it at
idle.
Malfunction or open circuit in fuel injection
system relay
Replace if defective.
1. Disconnect the starting circuit cut-off relay
from the wire harness.
2. Connect the pocket tester (Ω 1) and battery
(12 V) to the starting circuit cut-off relay termi-
nals as shown.
3. Does the starting circuit cut-off relay have con-
tinuity between red and red/blue?
Connected condition of connector
Inspect the coupler for any pins that may
have pulled out.
Check the locking condition of the coupler.
If there is a malfunction, repair it and connect it
securely.
Starting circuit cut-off relay coupler
(fuel injection system relay)
Fuel pump coupler
Injector coupler
ECU coupler
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