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312E, 312F, 313F, 316E, 316F, 318E, 318F, 320E, 320F, 323E, 323F, 324E, 325F, 326F, 329E, 329F, 330F, 335F, 336E, 336F, 340F, 349E, 349F, 352F, 374F and 390F Excavators and 336E MHPU and 349E MHPU Mobile Hydraulic Power Units Air Conditioning and Hea Caterpillar


Air Conditioning E14 - Ambient Air Temperature Sensor (Short Circuit)

Usage:

352F-VG A9J
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Illustration 1g02393477
(1) Ambient air temperature sensor

Diagnostics

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Illustration 2g02517078
Partial Electrical Schematic
(A) Connector
(C) Connector
(CC) Connector
(L) Connector
(1) Ambient air temperature sensor
(2) Control panel

  1. Disconnect ambient air temperature sensor (1) connector from connector (L). Measure the value of the resistance in the ambient air temperature sensor. See "Specifications" below for the correct resistance value. Proceed to Step 2.

  2. If the resistance value is incorrect, see Step 3. If the resistance value is correct, see Step 4.

  3. Replace the ambient air temperature sensor.

  4. Measure the voltage between the "RD/WH" wire and the "BR/WH" wire at connector (L). See "Specifications" below for the correct voltage. Proceed to Step 5.

  5. If the voltage value is incorrect, see Step 6. If the voltage value is correct, see Step 7.

  6. Disconnect connector (C) from connector (CC). Check the wiring harness between connector (L) and connector (C). Repair the wiring harness if faulty. Also, check the system power source. Refer to Systems Operation, "Air Conditioning System Electrical Schematic".

  7. Reconnect the ambient air temperature sensor connector to connector (L). Measure the voltage between "RD/WH" wire and the "BR/WH" wire at connector (CC). See "Specifications" below for the correct voltage. Proceed to Step 8.

  8. If the voltage values are incorrect, see Step 9. If the voltage values are correct, see Step 10.

  9. Disconnect connector (A) from control panel (2). Check the wiring harness between connector (CC) and connector (A). Repair the wiring harness if faulty.

  10. Reconnect connector (C) to connector (CC). Measure the voltage between the "RD/WH" wire and the "BR/WH" wire at control panel (2). If the voltage value is incorrect, replace the control panel.

Specifications

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Illustration 3g02318095
Ambient Air Temperature Sensor Characteristics
(R) Resistance (k Ohms)
(T) Temperature (Ambient air)

Resistance in the ambient air temperature sensor

25° C (77° F) ... 1.7k Ohms

Voltage between connectors ... 5 VDC

Caterpillar Information System:

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