Air Conditioning E13 - Ambient Air Temperature Sensor (Open Circuit)
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| Illustration 1 | g03715894 |
| (1) Ambient air temperature sensor (fresh air) | |
Ambient air temperature sensor (1) is located underneath the cab, on the right side.
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| Illustration 2 | g03717688 |
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Partial electrical schematic (A) Connector (B) Connector (C) Connector (D) Connector (1) Ambient air temperature sensor | |
- Disconnect ambient air temperature sensor (1) connector from connector (D). Measure the value of the resistance in the ambient air temperature sensor. See "Specifications" for the correct resistance value. Proceed to Step 2.
- If the resistance value is incorrect, see Step 3. If the resistance value is correct, see Step 4.
- Replace the ambient air temperature sensor.
- Measure the voltage between the "GY/YL" wire and the "ORN/BLU" wire at connector (D). See "Specifications" for the correct voltage. Proceed to Step 5.
- If the voltage value is incorrect, see Step 6. If the voltage value is correct, see Step 7.
- Disconnect connector (C) from connector (B). Check the wiring harness between connector (D) and connector (C). Repair the wiring harness if faulty. Also, check the system power source. Refer to Systems Operation, "Air Conditioning System Electrical Schematic".
- Reconnect the ambient air temperature sensor connector to connector (D). Measure the voltage between "GY/YL" wire and the "ORN/BLU" wire at connector (B). See "Specifications" for the correct voltage. Proceed to Step 8.
- If the voltage values are incorrect, see Step 9. If the voltage values are correct, see Step 10.
- Disconnect connector (A) from the control panel. Check the wiring harness between connector (B) and connector (A). Repair the wiring harness if faulty.
- Reconnect connector (C) to connector (B). Measure the voltage between the "GY/YL" wire and the "ORN/BLU" wire at the control panel. If the voltage value is incorrect, replace the control panel.
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| Illustration 3 | g02318095 |
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Ambient air temperature sensor characteristics (R) Resistance (k Ohms) (T) Temperature (Ambient air) | |
Resistance in the fresh air sensor
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0 °C (32 °F) ... 1.645 kΩ25 °C (77 °F) ... 5 kΩ
Voltage between connectors ... 5.0 V
Voltage between terminals
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10 °C (50 °F) ... 2.00 V20 °C (68 °F) ... 1.49 V25 °C (77 °F) ... 1.25 V30 °C (86. °F) ... 1.06 V
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