FUEL INJECTION SYSTEM
8-73
2 Connection of wire harness
ECU coupler.
Check the locking condition
of the coupler.
Disconnect the coupler and
check the pins (bent or bro-
ken terminals and locking
condition of the pins).
Improperly connected →
Connect the coupler secure-
ly or replace the wire har-
ness.
Start the engine and let it idle
for approximately 30 sec-
onds.
Fault code number is not dis-
played → Service is finished.
Fault code number is dis-
played → Go to item 3.
3 Wire harness continuity. Open or short circuit → Re-
place the wire harness.
Between relay unit coupler
and joint coupler.
red/blue–red/blue
Between joint coupler and
ECU coupler.
red/blue–red/blue
Between relay unit coupler
and fuel injection system
fuse.
brown/white–brown/white
Between fuel injection sys-
tem fuse and main switch
coupler.
red–red
Between main switch coupler
and main fuse coupler.
red–red
Between main fuse coupler
and battery terminal.
red–red
Start the engine and let it idle
for approximately 30 sec-
onds.
Fault code number is not dis-
played → Service is finished.
Fault code number is dis-
played → Go to item 4.
4 Defective relay unit. Execute the diagnostic
mode. (Code No. 50)
No operating sound → Re-
place the relay unit.
Start the engine and let it idle
for approximately 30 sec-
onds.
Fault code number is not dis-
played → Service is finished.
Fault code number is dis-
played → Go to item 5.
5 Defective relay unit. Execute the diagnostic
mode. (Code No. 09)
Fuel system voltage is be-
low 3 V → Replace the relay
unit.
Start the engine and let it idle
for approximately 30 sec-
onds.
Fault code number is not dis-
played → Service is finished.
Fault code number is dis-
played → Go to item 6.
6 Malfunction in ECU. Replace the ECU.
Refer to “REPLACING THE
ECU (engine control unit)” on
page 8-174.
Fault code No. 43
Item
Fuel system voltage: incorrect voltage supplied to the fuel in-
jector and fuel pump.
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