10. Malfunction indicator light (MIL) driving stage (see Table 1-12)
Table 1-12
Diagnostic Trouble Code (DTC) Trouble Location or Type
P0650 MIL control circuit
S/N Operation Test Results Actions
1 Ignition switch in position ON. Next step
Yes Next step
2
Open the instrument panel, remove the MIL bulb,
and measure the voltage of the jack. Is the voltage
about 12V?
No 5 (check hot wire)
Yes Next step
3
Check the MIL bulb for normal operation with a
multimeter.
No Replace bulb
Yes Repair or replace harness
4
Connect an adapter between the ECU and the
harness. Check for open or short circuit between
pin J1-63 of the ECU and the input connector of the
MIL bulb with a multimeter.
No Replace ECU
Yes Replace fuse
5
Check the fuse for the heating circuit of the oxygen
sensor. Is the fuse OK?
Yes Repair or replace harness
6
Check for open or short circuit between pin 87 of
the main relay and pin (1) of the MIL jack with a
multimeter.
No Next step
7 Repair or replace the main relay and its circuit.
11. Driving stage of stepper motor coil 1 and 2 (see Table 1-13)
Table 1-13
S/N Operation Test Results Actions
1
Turn on the ignition switch, and do not start the
engine.
Next step
Yes Next step
2
Disconnect the stepper motor from the harness.
Measure the resistance between pin (1) and pin (2),
as well as between pin (3) and pin (4) of the stepper
motor with a multimeter. Is the resistance between
40Ω and 80Ω?
No Replace idle speed actuator
Yes Next step
3
Measure the resistance between pin (1) and pin (2),
as well as between pin (3) and pin (4) of the stepper
motor with a multimeter. Is the resistance infinite?
No Replace idle speed actuator
Yes Replace idle speed actuator
4
Measure the resistance between pin (1) and pin (2),
as well as between pin (3) and pin (4) of the stepper
motor connected with the harness with a multimeter.
Is the resistance about 12V?
No Next step
Yes Repair or replace harness
5
Connect an adapter between the ECU and the
harness. Check for open or short circuit between pin
J1-34, J1-33, J1-53, J1-54 of the ECU and the pin (1),
(2), (3), (4) of the stepper motor with a multimeter.
No Replace ECU
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