9. Unstable idle speed or flameout under load (A/C etc)
Table 1-59
S/N Operation Test Results Actions
Yes Remove the trouble
1
Turn the ignition switch to ON. Check if there is trouble
information records with a diagnostic instrument.
No Next step
Yes Next step
2
Turn on the A/C switch. Connect an adapter between
the ECU and the harness. Check the pin J1-09 and
J1-39 (A/C switch) of the ECU for signal input.
No Check and repair A/C circuit
Yes Next step
3
Check the A/C system pressure, electromagnetic clutch
of the compressor, A/C pump for normal operation.
No Repair or replace
Yes Next step
4
Turn the ignition switch to ON. Check the voltage of the
pin 19, 20, 35, 36 (output to idle speed actuator) of the
ECU. Is it OK?
No Check the control circuit
Yes
Repair or replace stepper
motor
5
Remove the stepper motor. Check if the stepper motor
is locked or blocked.
No Next step
Yes Replace ECU
6
Start the engine, and run the A/C. Check if the idle
speed actuator is under normal operation as per the
steps of the motor on the trouble diagnostic instrument.
No Replace idle speed actuator
10. Unstable periodicity (self-learning after power cutoff of the ECU)
Table 1-60
S/N Operation Test Results Actions
Yes Remove the trouble
1
Turn the ignition switch to ON. Check if there is trouble
information records with a diagnostic instrument.
No Next step
Yes Next step
2 Check the air filter for smoothness.
No Replace
Yes Next step
3
Run the engine at an idle speed. Check if the intake air
pressure is between 35kPa and 65kPa.
No Check air intake and leakage
Yes 7
4
Run the engine at an idle speed. Cut off each cylinder in
sequence. Check if the rotation speed of the engine is
dcreased or fluctuated.
No Next step
Yes Next step
5
Turn the ignition switch to ON. Connect an adapter
between the ECU and the harness. Check the voltage of
the pin J1-42 (intake air manifold absolute pressure
sensor output), J1-27 (intake air temperature sensor
output), J1-43 (coolant temperature sensor output),
J1-62, J1-06, J1-38 (oxygen sensor output), J1-01
(ignition switch), J1-54, J1-33, J1-53, J1-34 (output to
idle speed actuator). Is it OK?
No Repair or replace harness
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