Operation Manual

FUEL INJECTION SYSTEM
8-60
Fault code No. 43
Item
Fuel system voltage: incorrect voltage supplied to the fuel injector
and fuel pump.
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. d:09, d:50
d:09
Meter display
Fuel system voltage (battery voltage)
Approximately 12.0
Procedure
Set the engine stop switch to “ ”, and then compare the actually
measured battery voltage with the meter display value. (If the actu-
ally measured battery voltage is low, recharge the battery.)
d:50
Actuation
Actuates the fuel injection system relay five times at one-second
intervals.
Illuminates the engine trouble warning light.
Procedure
Check that the fuel injection system relay is actuated five times by
listening for the operating sound.
Item/components and
probable cause
Check or maintenance job
Sensor inspection proce-
dure
1 Connection of fuel injection
system relay coupler
Check the connection of the
coupler is secure.
Disconnect the coupler, and
check each pin (for bending,
wear, or locking).
Poor connection → Connect it
securely, or repair/replace the
wire harness.
Start and idle the engine for
approximately 5 seconds.
Then, check the fault code
indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
2 Connection of wire harness
ECU coupler
Check the connection of the
coupler is secure.
Disconnect the coupler, and
check each pin (for bending,
wear, or locking).
Poor connection → Connect it
securely, or repair/replace the
wire harness.
Start and idle the engine for
approximately 5 seconds.
Then, check the fault code
indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
3 Continuity of wire harness
between the battery, main
fuse, fuel injection system
fuse, fuel injection system
relay and ECU
Open or short circuit →
Replace the wire harness.
Red–Red
Red/blue–Red/blue
Start and idle the engine for
approximately 5 seconds.
Then, check the fault code
indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
4 Fuel injection system relay
malfunction
Check in the diagnostic mode
(Code No. d:50).
No operation sound of fuel
injection system relay is
heard. → Replace the fuel
injection system relay.
Start and idle the engine for
approximately 5 seconds.
Then, check the fault code
indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.