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AT AT AT AT Air Air Air Air Conditioner Conditioner Conditioner Conditioner - 189 - Diagnosis Diagnosis Diagnosis Diagnosis and and and and Testing Testing Testing Testing A/C A/C A/C A/C system system system system performance performance performance performance diagnosis diagnosis diagnosis diagnosis 12. Fault diagnosis of internal/external circulation. Step Operation Yes No 1 ①Turn the ignition switch to ON position with the engine off. ②Set the blower motor switch to maximum speed position. ③Set the mode switch to “TO-FACE/FEET” position. ④Set the internal circulation switch to “VENTILATION” position. ⑤Set the internal circulation switch to “INTERNAL CIRCULATION” position. Do you hear any change in air flow sound when setting the internal Go to Step 2. Go to Step 2. 2 ①Set the internal circulation switch to “VENTILATION” position. ②Observe the drive shaft of internal circulation actuator. ③Set the internal circulation switch to “INTERNAL CIRCULATION” position. Does the drive shaft of internal circulation actuator rotate? Go to Step 3. Go to Step 3. 3 ①Observe the drive shaft of internal circulation actuator. ②Use the fault diagnosis instrument and command the internal circulation actuator transfer to “INTERNAL CIRCULATION” and Does the drive shaft of internal circulation actuator rotate? Go to Step 11. Go to Step 4. 4 ①Turn the ignition switch to OFF position. ②Disconnect the internal circulation actuator. ③Turn the ignition switch to ON position with the engine off. ④Use a test lamp connected to sound ground to detect the ignition voltage circuit 3 of internal circulation actuator. Is the test lamp on? Go to Step 5. Go to Step 12. 5 ①Set a test lamp between damper control Circuit A and ignition voltage circuit 3 of internal circulation actuator. ②Use the fault diagnosis instrument and command the internal circulation actuator transfer to “INTERNAL CIRCULATION” and Is the test lamp on when this command is executed? Go to Step 6. Go to Step 7. 6 ①Set a test lamp between damper control circuit B and ignition voltage circuit 3 of internal circulation actuator. ②Use the fault diagnosis instrument and command the internal circulation actuator transfer to “INTERNAL CIRCULATION” and Is the test lamp on when this command is executed? Go to Step 9. Go to Step 8. 7 Check the internal circulation actuator control Circuit A for open circuit, Is the fault detected and eliminated? Go to Step 15. Go to Step 11. 8 Check the internal circulation actuator control Circuit B for open circuit, Is the fault detected and eliminated? Go to Step 15. Go to Step 11. |