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FI
FUEL INJECTION SYSTEM
Code No.
43
Symptom
The ECU is unable to monitor the battery voltage.
Used diagnostic code No. 50 (fuel injection system relay)
Inspection operation item and probable cause Operation item and countermeasure
Reinstatement
method
1.Malfunction in ECU
Fuel injection system relay is on.
Reinstated by
starting the engine
and operating it at
idle.
2.Open or short circuit in the wiring harness.
Repair or replace if there is an open or short
circuit.
Main wiring harness
Red - Red
Red/Black - Red/Black
Red/Blue - Red/Blue
Blue/Yellow - Blue/Yellow
3.Malfunction or open circuit in fuel injection
system relay
Replace if defective.
Refer to “FUEL INJECTION SYSTEM” in
chapter 7.
If there is no malfunction with the fuel injection
system relay, replace the ECU.
4.Connected state 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.
Fuel injection system relay coupler
ECU coupler
Code No.
50
Symptom
Faulty ECU memory. (When this malfunction is detected in the ECU, the
fault code number might not appear on the meter.)
Used diagnostic code No.
Inspection operation item and probable cause Operation item and countermeasure
Reinstatement
method
1.Malfunction in ECU
Replace the ECU.
Reinstated by turn-
ing the main switch
ON.
