312C, 315C, 318C, 319C, 320C, 322C, 325C and 330C Excavators Air Conditioning and Heating Caterpillar


Troubleshooting Faults With Service Codes

Usage:

315C AKE

Starting the Fault Diagnosis




Illustration 1g01026613

(1) Display of set temperature

(2) Temperature selection switch (increase)

(3) Recirculation switch

(4) "DEF" switch

(5) Temperature selection switch (decrease)

(6) Power switch

Note: Understand the starting procedure before you begin.

  1. Turn the engine start switch ON.

  1. Turn power switch (6) of the air conditioner OFF.

  1. Depress the temperature selection switch (increase) (2) and the temperature selection switch (decrease) (5) on the control panel at the same time. Hold both switches down for at least three seconds.

  1. The diagnosis procedure shall start. If any error is memorized, the smallest error code is displayed on display (1). If no problems exist, "E-.-" is displayed.

  1. When the temperature selection switch (increase) (2) is depressed, error codes are displayed. The error codes are displayed in ascending order from "E11" to "E51". When the temperature selection switch (decrease) (5) is depressed, error codes are displayed. The error codes are displayed in descending order from "E51" to "E11".

    Note: When only one error code exists, the same display is repeated. A flashing display means that the error code is continuing from the past. A non-flashing display means that the error code was found in the past, but the error code is not found now.

  1. When the fault diagnosis is running, the control of each function is altered.

    • All outputs from the control panel except error codes are turned OFF.

    • The panel light turns ON.

  1. Clear the error codes. Depress the following two switches on the control panel at the same time: recirculation switch (3) and "DEF" switch (4). Hold both switches down for at least three seconds.

    Note: Clear any error codes when the equivalent problems have been repaired. Make sure that the same error code is not displayed again. When a problem has not yet been repaired, the equivalent error code should be displayed again.

Ending the Fault Diagnosis

There are two ways to end the fault diagnosis.

  1. Turn the engine start switch OFF.

  1. Press power switch (6) .

Error Codes

Table 1
Error Codes for the Automatic Temperature Control (ATC)    
Code     Problem Area     Problem    
"E11"     Sensor for recirculated air     Open circuit    
"E12"     Sensor for recirculated air     Short circuit    
"E13"     Sensor for fresh air     Open circuit    
"E14"     Sensor for fresh air     Short circuit    
"E15"     Water temperature sensor     Open circuit    
"E16"     Water temperature sensor     Short circuit    
"E17"     Sunlight sensor     Open circuit    
"E18"     Sunlight sensor     Short circuit    
"E21"     Sensor at evaporator     Open circuit    
"E22"     Sensor at evaporator     Short circuit    
"E43"     Air damper for discharge of air     Incorrect movement    
"E44"     Air damper for mixed air     Incorrect movement    
"E45"     Air damper for recirculated air versus fresh air     Incorrect movement    
"E51"     Refrigerant pressure     High/low error    

Inspecting a Wiring Harness

Electrical problems are often caused by faulty electrical wires that have either an open circuit or a short circuit. The following procedures explain the test for an open circuit or a short circuit:

Reference: Refer to the Testing and Adjusting, "Air Conditioning System Schematic" section for the correct electrical schematic.

Reference: Refer to the Testing and Adjusting, "Heating System Schematic" section if your machine has a heater only.

Test for an open circuit.

  1. Turn the battery disconnect switch key and the key start switch to the OFF position.

    Note: A separate electrical wire must be used to perform an open circuit test. Any harness wire can be used.

  1. Install a jumper (connecting wire) between the two electrical wires at one end of the harness.

  1. Use a multimeter in order to check for continuity across the two electrical wires at the other end of the harness.

  1. Turn the multimeter dial to the 200 ohm range and measure the electrical resistance.

Note: If there is continuity between the electrical wires, the multimeter will have a reading of less than 5 ohms. If there is not continuity, the electrical wire is faulty. The electrical wire should be replaced with another wire of the same gauge.

Test for a short circuit.

  1. Turn the battery disconnect switch key and the key start switch to the OFF position.

  1. Disconnect the electrical wire.

  1. Turn the multimeter dial to the 200 ohm range and measure the electrical resistance.

  1. Use one multimeter probe in order to make contact with the connector of the faulty electrical wire.

  1. Use the other probe from the multimeter to check for continuity across all other electrical wires in the same harness.

  1. If there is continuity between any of the electrical wires, the multimeter will have a reading of less than 5 ohms.

Note: If there is not continuity, the electrical wire is faulty. The electrical wire should be replaced with another wire of the same gauge.

Inspecting an Air Damper

Error code E43, error code E44, and error code E45 can appear due to incorrect movement of the air dampers. The following procedure will explain the test for the E43 error code:

Reference: Refer to the Disassembly and Assembly manual for your machine in order to disassemble the actuators.

  1. Disconnect the actuator from the air damper.

  1. If you can manually turn the air damper, the air passage is free.

    Note: There may be a problem with the actuator.

  1. If you can not manually turn the air damper, check the air passage for debris. If debris is found, remove the debris from the air passage and check the movement of the air damper.

  1. Reconnect the actuator to the air damper.

  1. Repeat Step 1 to Step 4 for error code E44 and error code E45.

  1. Check the control panel for error codes. If one or more error codes for the air dampers are still present and the air dampers can be turned manually, there is a problem with the actuator. Replace the appropriate actuators.

Caterpillar Information System:

325C Excavator 3126B Engine Supplement Radiator - Install - Engine in Chassis
314C CR Excavator Hydraulic System Travel Motor - Test - Measurement of Case Drain Oil
325C Excavator 3126B Engine Supplement Muffler - Remove and Install - Engine in Chassis
314C CR Excavator Hydraulic System Main Hydraulic Pump
2002/02/11 Guideline for Reusable Parts and Salvage Operations, SEBF8474 , "Caterpillar Hydraulic Hammers" is Available {6333}
325C Excavator 3126B Engine Supplement Radiator - Remove - Engine in Chassis
C-9 Engine for the 330C Excavator and for the 330C Mobile Hydraulic Power Unit Low Power/Poor or No Response to Throttle
314C CR Excavator Machine System Specifications Main Hydraulic Pump
N3 Series Brushless Alternators General Information
314C CR Excavator Hydraulic System Swing Motor - Test - Measurement of Case Drain Oil
322C Forest Machine Machine Systems Stick Cylinder - Install
Installation of a Four-Way Pilot Valve Group (Control Pattern Change) {5059} Installation of a Four-Way Pilot Valve Group (Control Pattern Change) {5059}
N3 Series Brushless Alternators Component Description
305 Mini Hydraulic Excavator Machine Systems Fuel Tank - Remove
304 Mini Hydraulic ExcavatorEngine Supplement and Machine Systems Travel Motor - Disassemble
5230B Excavator Machine Systems Pump Drive - Remove
314C CR Excavator Machine System Specifications Swing Motor
5230B Excavator Machine Systems Fan Motor (Radiator Cooling) - Install
C-9 Engine for the 973C Track-Type Loader CID 0091 FMI 02 Incorrect Throttle Switch inputs
312C, 315C, 318C, 319C, 320C, 322C, 325C and 330C Excavators Air Conditioning and Heating Air Conditioning System Troubleshooting
304 Mini Hydraulic ExcavatorEngine Supplement and Machine Systems Travel Motor - Assemble
C-9 Engine for the 12H Motor Grader CID 0175 FMI 03 Engine Oil Temperature open/short to +batt
5230B Excavator Machine Systems Pump Drive - Install
C-9 Engine for the 12H Motor Grader CID 0175 FMI 04 Engine Oil Temperature short to ground
Back to top
The names Caterpillar, John Deere, JD, JCB, Hyundai or any other original equipment manufacturers are registered trademarks of the respective original equipment manufacturers. All names, descriptions, numbers and symbols are used for reference purposes only.
CH-Part.com is in no way associated with any of the manufacturers we have listed. All manufacturer's names and descriptions are for reference only.