Yamaha YZF-R1P Service Manual page 366

Fault code No. 43
Used diagnostic code No. 09 (fuel system voltage)
Inspection operation item and probable cause Operation item and countermeasure
Malfunction in ECU
Open or short circuit in the wiring harness.
Malfunction or open circuit in fuel injection sys-
tem relay
Connected condition of connector
Inspect the coupler for any pins that may
have pulled out.
Check the locking condition of the coupler.
FUEL INJECTION SYSTEM
Symptom The ECU is unable to monitor the battery voltage.
Fuel injection system relay is on.
Repair or replace if there is an open or short
circuit.
Between battery terminal and ECU coupler.
Red - White
Red - Blue/Yellow (Main switch and engine
stop switch are on.)
Red - Red/Blue (Fuel injection system relay
is on.)
Replace if defective.
1. Disconnect the starting circuit cut-off relay
from the wire harness.
2. Connect the pocket tester (Ω × 1) and bat-
tery (12 V) to the starting circuit cut-off
relay terminals as shown.
Battery positive terminal → red/black 1
Battery positive terminal → blue/yellow 2
Tester positive probe → red 3
Tester negative probe → red/blue 4
3. Does the starting circuit cut-off relay have
continuity between blue/white and black?
If there is a malfunction, repair it and connect it
securely.
Starting circuit cut-off relay coupler
(fuel injection system relay)
ECU coupler
7 - 25
FI
Reinstatement
method
Reinstated by
starting the engine
and operating it at
idle.