Refrig Press Sensor Shorted Low (Active) - Mercedes-Benz Sprinter 2003 Manual

Symptom:

REFRIG PRESS SENSOR SHORTED LOW (ACTIVE)

REFRIGERANT PRESSURE SENSOR
5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND CIRCUIT
5 VOLT SUPPLY CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT
REFRIGERANT PRESSURE SENSOR FEEDBACK CIRCUIT SHORTED TO GROUND
REFRIGERANT PRESSURE SENSOR FEEDBACK CIRCUIT SHORTED TO GROUND CIRCUIT
REFRIGERANT PRESSURE SENSOR FEEDBACK CIRCUIT SHORTED TO SENSOR GROUND
CIRCUIT
AUTOMATIC TEMPERATURE CONTROL (ATC)
TEST
1 Turn the ignition off.
Disconnect the Refrigerant Pressure Sensor harness connector.
NOTE: All of the following criteria must be met in order to successfully run
the ATC Function Test.
Place the shift lever in Park.
Turn the ignition on.
With the DRBIII , record and erase ATC DTC's.
Start the engine. Allow the engine to reach normal operating temperature.
Set the blower to high speed.
Press the Air Conditioning switch On.
With the DRBIII , verify that the ambient temperature is above 59°F (15°C), the
refrigerant pressure is between 29 and 348 PSI (2 and 24 bar), the evaporator
temperature is above 36.5°F (2.5°C), and the coolant temperature is above 158°F
(70°C).
With the DRBIII in Automatic Temperature Control (ATC), select System Tests and
select ATC Function Test. When the ATC Function Test is complete, proceed as
follows:
With the DRBIII , read the active ATC DTCs.
Does the DRBIII display: REFRIG PRESS SENSOR SHORTED LOW?
Yes → Go To 2
No
2 Turn the ignition off.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between ground and the 5 Volt Supply circuit.
Is the resistance below 10k ohms?
Yes → Repair the 5 Volt Supply circuit for a short to ground.
No
POSSIBLE CAUSES
ACTION
→ Replace the Refrigerant Pressure Sensor in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Perform BODY VERIFICATION TEST - VER 1.
→ Go To 3
171
HEATING & A/C
APPLICABILITY
All
All