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Symptom: REFRIG PRESS SENSOR SHORTED LOW (ACTIVE) POSSIBLE CAUSES 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 AUTOMATIC TEMPERATURE CONTROL (ATC) TEST ACTION APPLICABILITY 1 Turn the ignition off. t, record and erase ATC DTC’s. Start the engine. Allow the engine to reach normal operating temperature. t, 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 t in Automatic Temperature Control (ATC), select System Tests and select ATC Function Test. When the ATC Function Test is complete, proceed as t, read the active ATC DTCs. Does the DRBIII t display: REFRIG PRESS SENSOR SHORTED LOW? All Yes → Go To 2 No → Replace the Refrigerant Pressure Sensor in accordance with the Service Information. 2 Turn the ignition off. All Yes → Repair the 5 Volt Supply circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. No → Go To 3 173 HEATING & A/C |