7-40
FUEL INJECTION SYSTEM
Fault code No. 50
Symptom ECU internal malfunction
Fail-safe system Unable to start
Unable to drive
Diagnostic code No. —
FI diagnostic tool dis-
play
—
Checking method —
Item Item/components and probable cause Check or maintenance job Checking method
1 Malfunction in ECU. Replace the ECU. Set the switch on the
FI diagnostic tool sub-
wire harness to "ON",
and then check the
fault code display.
Fault code number is
not displayed → Ser-
vice is finished.
Fault code No. waiting for connection
Symptom Communication signal is not received.
Fail-safe system Able to start (unable when ECU is malfunctioning)
Able to drive vehicle (unable when ECU is malfunctioning)
Diagnostic code No. —
FI diagnostic tool dis-
play
—
Checking method —
Item Item/components and probable cause Check or maintenance job Checking method
1 Check the connection and locking con-
dition of the FI diagnostic tool coupler.
Disconnect the coupler and check the
pins. (bent or broken terminals and
locking condition of the pins)
Poor connection → Properly
connect, repair, or replace.
Set the switch on the
FI diagnostic tool sub-
wire harness to "ON",
and then check the
fault code display.
Fault code number
is not displayed →
Service is finished.
Fault code number
is displayed → Re-
fer to item 2.
