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AT AT AT AT Air Air Air Air Conditioner Conditioner Conditioner Conditioner - 185 - 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 8. Fault diagnosis of blower motor. Step Operation Yes No 1 ①Turn the ignition switch to ON position with the engine off. ②Turn the blower motor switch to each speed position. If there any speed position failed? Go to Step 3. Go to Step 2. 2 Check blower motor fuse for blowout. Is the fuse blown out? Replace the fuse with a new one of the same rating. Go to Step 3. 3 Check the power supply of blower motor. The blower motor won’t run even though there is voltage. 4 ①Run the blower under every speed and run once at the integrated radio control position of blower. ②20 blower speeds should be effective. Is every blower speed effective? Go to Step 8. Go to Step 5. 5 ①Plug a 2-pin connector into the back of blower motor. ②Use integrated radio to control blower and run the blower once at each one of 20 blower speeds. ③Compare the voltage with the illustrated voltage. Please refer to “1.2.1.2 Sensor Resistance Table” in “Automatic Air Heater, Does the voltage approach to the illustrated voltage? Go to Step 8. Go to Step 6. 6 Connect the fault diagnosis instrument. Conduct combined testing for Is every speed effective Conduct integrated radio control testing for blower switch function. Go to Step 7. 7 Replace air heater, ventilation and A/C system control module. Is the fault detected and eliminated? Go to Step 8. 8 Run the system to check the maintenance result. Is the fault eliminated? System is normal. Go to Step 1 |