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Symptom: P1598-A/C PRESSURE SENSOR VOLTS TOO HIGH When Monitored and Set Condition: P1598-A/C PRESSURE SENSOR VOLTS TOO HIGH When Monitored: With the engine running and the A/C Relay energized. Set Condition: The A/C Pressure Sensor Signal at the PCM goes above 4.92 volts. POSSIBLE CAUSES INTERMITTENT CONDITION A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO 5 VOLT SUPPLY CIRCUIT A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE A/C PRESSURE SENSOR INTERNAL FAILURE A/C PRESSURE SENSOR SIGNAL CIRCUIT OPEN SENSOR GROUND CIRCUIT OPEN PCM TEST ACTION APPLICABILITY 1 NOTE: Ensure the A/C refrigerant System is properly charged per the t, read the A/C Pressure Sensor voltage. Is the voltage above 4.6 volts. All Yes → No → 2 Turn the ignition off. All Yes → Repair the A/C Pressure Sensor Signal circuit for a short to the 5 No → 204 HEATING & A/C |