7-33
FUEL INJECTION SYSTEMFI
To prevent damaging the sub-throttle ser-
vomotor, perform this test within a few se-
conds of connecting the battery. Positive battery terminal yellow / red
Negative battery terminal yellow / white
1
2
CAUTION:
Fault code No.48SymptomSub-throttle servo motor is stuck.
Used diagnostic code 56
OrderInspection operation item and probable
couseOperation item and countermeasureReinstatement
method
1Connected condition of connector
Inspect the coupler for any pins that
may have pulled out.
Check the locking condition of the
couplerIf there is a malfunction repair it and
connect it securely.
Sub-throttle servo motor coupler
Main wire harness ECU coupler.Reinstated by
turning the
main switch
ON.
It takes 120
2Open or short circuit in wire harness.Repair or replace if there is an open
or short circuit.
Between motor coupler and ECU coupler.
Yellow / Red – Yellow / Red
Yellow / White – Yellow / Whiteseconds at the
maximum
before the
original state
returns.
3Defective sub-throttle servo motor.Execute the diagnostic mode (Code No.56).
Replace if defective.
1. Disconnect the sub-throttle cables from the
Sub-throttle servomotor pulley.
2. Disconnect the sub-throttle servomotor coupler
from the wire harness.
3. Connect the battery leads to the sub-throttle
servomotor coupler as shown.
4. Check that the sub-throttle servomotor pulley
rotates several times.
5. Does the sub-throttle servomotor pulley turn?
Fault code No.50SymptomFaulty ECU memory. (When this malfunction is detected in the ECU, the fault
code number might not appear on the meter.)
Used diagnostic code No. – –
OrderInspection operation item and probable
causeOperation item and countermeasureReinstatement
method
1Malfunction in ECUReplace the ECU.Reinstated by
turning the
main switch
ON.
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