9. Unstable idle speed or flameout under load (A/C etc) Table 1-59 10. Unstable periodicity (self-learning after power cutoff of the ECU) Table 1-60 78 S/N Operation Test Results Actions 1 Turn the ignition switch to ON. Check if there is trouble information records with a diagnostic instrument. Yes Remove the trouble No 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. Yes Next step No Check and repair A/C circuit 3 Check the A/C system pressure, electromagnetic clutch of the compressor, A/C pump for normal operation.
Yes Next step No Repair or replace 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? Yes Next step No Check the control circuit 5 Remove the stepper motor. Check if the stepper motor is locked or blocked. Yes Repair or replace stepper motor No Next step 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. Yes Replace ECU No Replace idle speed actuator S/N Operation Test Results Actions 1 Turn the ignition switch to ON. Check if there is trouble information records with a diagnostic instrument.
Yes Remove the trouble No Next step 2 Check the air filter for smoothness. Yes Next step No Replace 3 Run the engine at an idle speed. Check if the intake air pressure is between 35kPa and 65kPa. Yes Next step No Check air intake and leakage 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. Yes 7 No 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? Yes Next step No Repair or replace harness