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 E45 - Air Inlet Damper Error

Usage:

352F-VG A9J


Illustration 1g02372561
(1) Air inlet motor
(2) Air inlet dampers
(T) Connector

Diagnostics



Illustration 2g02372676
(3) Air inlet select switch (Recirculated/Fresh air)
(4) Control panel


Illustration 3g02521058
Partial Electrical Schematic
(A) Connector
(B) Connector
(C) Connector
(CC) Connector
(D) Connector
(DD) Connector
(T) Connector
(1) Air inlet motor
(4) Control panel

  1. Select air inlet select switch (3) on control panel (4).

  2. Check for movement of air inlet motor (1). If the motor moves, even a little, see Step 3. If the motor does not move, see Step 6.

  3. If the error is shown after the initial action has finished, see Step 4. If the error is not shown after the initial action has finished, the outlet air damper is locked or there is a problem with the linkage.

  4. Disconnect connector (T) from the air inlet motor connector. Measure the resistance value between the "BU/BK" wire and the "BR/RD" wire of the air inlet motor connector. The resistance should be approximately 4.7k ohms. If the resistance value is correct, see Step 5. If the resistance value is incorrect, the air outlet motor is defective.

  5. Check for continuity between the "BU/BK" wire and the "YL/BK" wire, and between the "YL/BK" wire and the "BR/RD" wire of the air inlet motor connector. If there is continuity between the two sets of wires, the control panel is defective. If there is not continuity between the two sets of wires, the air outlet motor is defective.

  6. If the error is shown, see Step 7. If the error is not shown, replace control panel (4).

  7. Check the wiring harnesses between the air outlet motor and the control panel for continuity. If there is continuity, either the air outlet motor is defective, the air outlet damper is locked, or there is a problem with the linkage. If there is not continuity, the harness is defective.

Specifications

Resistance ... 4.7k Ohm

Voltage between connectors ... 5 VDC



Illustration 4g02350723

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