Sprinter 2500 L5-2.7L DSL Turbo (2002)
temperature specifications charts. Also, confirm that the water cycle valve is functioning. Remember that the valve is normally open. The pulse width
signal will offer insight into the valve's operation. The lower the percentage number, the more open the valve becomes. Confirm that the valve is
responding to the signal from the ATC. If functioning correctly, verify mode and blend door operation. If okay, the diagnosis then becomes purely
refrigerant system related. Attach the appropriate gauges and diagnose the refrigeration system. Refer to the Service Information for refrigerant system
diagnostic procedures.
DIAGNOSTIC TIPS
SENSOR VALUES
Ambient Air Temperature
The Instrument Cluster transmits Ambient Air Temperature Sensor data. In the event of a CAN Bus communication failure, the last stored value is
displayed as a substitute value.
Interior Temperature
The normal range for the Interior Temperature Sensor is from 32° F to 104° F. An implausible temperature value indicates that the Interior Temperature
Sensor is bad. The repair in this case would be to replace the ATC Module since the sensor is integral to the module.
Evaporator Temperature
The normal range for the Evaporator Temperature Sensor is from 14° F to 104° F. A substitute value of 14° F with no updates indicates an Evaporator
Temperature Sensor circuit failure.
Air Outlet Temperature
The normal range for the Air Outlet Temperature Sensor is from 32° F to 203° F. A substitute value of 111.1° F indicates an Air Outlet Temperature
Sensor circuit failure.
Coolant Temperature
The Engine Control Module transmits Coolant Temperature Sensor date. In the event of a CAN Bus communication failure, 257° F is displayed as a
substitute value.
Interior Temperature Controller
The normal range for the Blend control is from 62° F to 144° F. This value represents the temperature set by the operator. An implausible temperature
value or a temperature value that fails to change when rotating the Blend control indicates that the Blend control is bad. The repair in this case would be
to replace the ATC Module since the Blend control integral to the module.
Refrigerant Pressure
The normal range for the Refrigerant Pressure Sensor is from 29 PSI to 406 PSI. A substitute value of 413 PSI indicates a Refrigerant Pressure Sensor
circuit failure. In addition, the normal range for Pressure Sensor voltage is 0 volts to 5 volts. A value of 0.9 volts indicates an open voltage supply
circuit, while a value of -999 indicates an open in all three sensor circuits.
Water Cycle Valve
The normal range of the Water Cycle Valve is from 0% to 100%. The value indicates the extent to which the valve is closed. A value of 100% indicates
that the valve is fully closed.
Intense Inst Light
The Instrument Cluster transmits this data. The normal range for lighting intensity is from 0% to 100%. The value indicates the extent to which the
illumination has dimmed. A value of 0% indicates bright while a value >0% indicates dimming. In the event of a CAN Bus communication failure, 0% is
displayed as a substitute value.
INPUT/OUTPUT STATUS
Compressor Clutch
The ATC Module transmits this data. A status of ON indicates that the compressor is operational. A status of OFF indicates the compressor is not
operational.
Compres SO Accel (Compressor Shut Off - Due To Acceleration)
