RING-SQUARE 0992972 - Caterpillar

Starting the Fault Diagnosis
Illustration 1 g02338096
Control Panel (1a) Temperature select switch (increase) (1b) Temperature select switch (decrease) (2) Air inlet select switch (3) Main power On/Off switch (4) Display of set temperature (5) Defrost switch
Turn the engine start switch to ON.
Turn main power switch (3) of the air conditioner to OFF.
Depress temperature select switch (increase) (1a) and the temperature select switch (decrease) (1b) on the control panel at the same time. Hold both switches down for at least 3 seconds.
The diagnosis procedure shall start. If any error is memorized, the smallest error code is displayed on display (4) . If no problems exist, "E-.-" is displayed.
When the temperature select switch (increase) (1a) is depressed, error codes are displayed. The error codes are displayed in ascending order from "E11" to "E45". When the temperature select switch (decrease) (1b) is depressed, error codes are displayed. The error codes are displayed in descending order from "E45" 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.
Clear the error codes. Depress air inlet select switch (2) and defrost switch (5 ) on the control panel at the same time. Hold both switches down for at least 3 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.
Press main power switch (3) .
Turn the engine start switch to OFF.Error Codes
Table 1
Control Panel Diagnostic Error Codes    
Code    Problem Area    Problem    
"E11"     Intake air temperature sensor     Open circuit    
"E12"     Intake air temperature sensor     Short circuit    
"E13"     Ambient air temperature sensor     Open circuit    
"E14"     Ambient air temperature sensor     Short circuit    
"E15"     Water temperature sensor     Open circuit    
"E16"     Water temperature sensor     Short circuit    
"E21"     Evaporator sensor     Open circuit    
"E22"     Evaporator sensor     Short circuit    
"E33"     Air outlet motor     Open/Short circuit    
"E34"     Air blend motor     Open/Short circuit    
"E35"     Air inlet motor     Open/Short circuit    
"E43"     Damper for air outlet     No movement    
"E44"     Damper for air blend     No movement    
"E45"     Damper for air inlet     No 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