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Symptom: P1599-A/C PRESSURE SENSOR VOLTAGE TOO LOW When Monitored and Set Condition: P1599-A/C PRESSURE SENSOR VOLTAGE TOO LOW When Monitored: With the engine running and the A/C Relay energized. Set Condition: The A/C Pressure Sensor Signal voltage at the PCM goes below 0.58 volts for 2.6 seconds. POSSIBLE CAUSES A/C PRESSURE SENSOR VOLTAGE BELOW 0.6 OF A VOLT (F888) 5-VOLT SUPPLY CIRCUIT OPEN (F888) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND A/C PRESSURE SENSOR (C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND (C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO (K900) SENSOR GROUND CIRCUIT PCM TEST ACTION APPLICABILITY 1 NOTE: Ensure the A/C refrigerant System is properly charged per the t, read DTCs and record the related Freeze Frame data. Start the engine. t, read the A/C Pressure Sensor voltage. Is the voltage below 0.60 of a volt? All Yes → Go To 2 No → Refer to the INTERMITTENT CONDITION Symptom (Diagnos- tic Procedure). 2 Turn the ignition off. All Yes → Go To 3 No → Go To 6 175 DRIVEABILITY - GAS |