7. Unstable idle speed during warm-up
Table 1-57
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
manifold pressure is between 35kPa and 65kPa during
warm up.
No
Remove leakage for the air
intake system
Yes Next step
4
Stop the engine, and turn on the ignition switch. Connect
an adapter between the ECU and the harness. Check
the pin J1-27 and J1-35 of the ECU (signal output end of
the intake air temperature sensor and coolant
temperature sensor).
No Check and repair
Yes Next step
5
Take out he connector of the idle speed actuator after
warm-up. Check if the rotation speed of the engine is
changed.
No Replace idle speed actuator
Yes Next step
6
Check the coolant temperature sensor for normal
operation.
No Replace
8. Unstable idle speed after warm-up
Table 1-58
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 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), J1-54,
J1-33, J1-53, J1-34 (output to idle speed actuator) of the
the ECU. Is the voltage normal?
No Repair or replace harness
Yes Next step
3 Check the air filter for smoothness.
No Replace
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