HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS) > Diagnostics with Phenomenon
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Symptoms |
Faulty parts |
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A/C system fails to operate. |
• Fuse (F/B No. 7, 22, 31) • Connector (Poor contact) • Ground • Auto A/C control module • Blower fan motor • Blower fan relay • A/C relay • Compressor (Magnet clutch) • Evaporator sensor • Compressor (compressor speed sensor, diesel engine model) • ECM |
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Fuse is blown out. |
• Fuse (F/B No. 7, 22, 31) • Connector (Poor contact) |
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Illumination cannot dim. |
• Fuse (F/B No. 7, 22, 31) • Connector (Poor contact) • Auto A/C control module |
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Blower fan does not rotate or fan speed cannot be controlled. |
• Fuse (F/B No. 7, 22, 31) • Connector (Poor contact) • Ground • Auto A/C control module • Blower fan motor • Blower fan relay • Power transistor |
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Unable to switch suction vents. |
• Connector (Poor contact) • Auto A/C control module • Intake door actuator |
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Unable to switch vents. |
• Connector (Poor contact) • Auto A/C control module • Mode door actuator |
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Compartment temperature does not rise. (Warm air does not come out.) |
• Connector (Poor contact) • Auto A/C control module • Air mix door actuator • In-vehicle sensor, ambient sensor, evaporator sensor and sunload sensor • In-vehicle sensor aspirator hose • PTC heater (diesel engine model) |
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Compartment temperature does not lower. (Cold air does not come out.) |
• Connector (Poor contact) • Auto A/C control module • Air mix door actuator • A/C relay • Compressor (Magnet clutch) • Radiator fan motor • Radiator fan relay • In-vehicle sensor, ambient sensor, evaporator sensor and sunload sensor • In-vehicle sensor aspirator hose • Compressor (compressor speed sensor, diesel engine model) |
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Compartment temperature is higher or lower than setting temperature. |
• Auto A/C control module • Air mix door actuator • In-vehicle sensor, ambient sensor, evaporator sensor and sunload sensor • In-vehicle sensor aspirator hose |
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Compartment temperature does not quickly respond to setting temperature. |
• Air mix door actuator • In-vehicle sensor, ambient sensor, evaporator sensor and sunload sensor • In-vehicle sensor aspirator hose |
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Radiator fan does not rotate during A/C operation. |
• Radiator fan motor • Radiator fan relay • ECM |