Starting the Fault Diagnosis
Illustration 1 | g01026613 |
(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.
- Turn the engine start switch ON.
- Turn power switch (6) of the air conditioner OFF.
- 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.
- 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.
- 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.
- 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.
- All outputs from the control panel except error codes are turned OFF.
- 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.
- Turn the engine start switch OFF.
- Press power switch (6) .
Error Codes
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.
- 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.
- Install a jumper (connecting wire) between the two electrical wires at one end of the harness.
- Use a multimeter in order to check for continuity across the two electrical wires at the other end of the harness.
- 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.
- Turn the battery disconnect switch key and the key start switch to the OFF position.
- Disconnect the electrical wire.
- Turn the multimeter dial to the 200 ohm range and measure the electrical resistance.
- Use one multimeter probe in order to make contact with the connector of the faulty electrical wire.
- Use the other probe from the multimeter to check for continuity across all other electrical wires in the same harness.
- 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.
- Disconnect the actuator from the air damper.
- If you can manually turn the air damper, the air passage is free.
Note: There may be a problem with the actuator.
- 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.
- Reconnect the actuator to the air damper.
- Repeat Step 1 to Step 4 for error code E44 and error code E45.
- 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.