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• When Monitored: • Set Condition: Possible Causes (C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO VOLTAGE (C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (K301) 5-VOLT SUPPLY CIRCUIT (C18) A/C PRESSURE SIGNAL CIRCUIT OPEN (K310) SENSOR GROUND CIRCUIT OPEN A/C PRESSURE TRANSDUCER BCM Diagnostic Test 1. CHECK THE A/C PRESSURE TRANSDUCER VOLTAGE NOTE: Verify that the A/C Refrigerant System is properly charged before proceeding. With the scan tool, read the A/C Pressure Transducer voltage. Is the voltage above 4.6 volts? Yes >> Go To 2 No >> Go To 7 2. CHECK THE (C18) A/C PRESSURE SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the A/C Pressure Transducer harness connector. Turn the ignition on. Measure the voltage of the (C18) A/C Pressure Signal circuit. Is the voltage above 5.2 volts? Yes >> Repair the (C18) A/C Pressure Signal circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - CONTROL MODULES - STANDARD PROCEDURE). No >> Go To 3 8E - 4 ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC KJ |