P0532-A/C PRESSURE SENSOR CIRCUIT LOWFor a complete wiring diagram Refer to Section 8W.When Monitored:Engine running, AC is learned, and AC Clutch Relay energized.Set Condition:The A/C pressure transducer signal voltage at the PCM goes below 0.58 of a volt for 2.6 seconds. One Trip Fault. Three good trips to turn off the MIL.
Possible Causes(C818) 5-VOLT SUPPLY CIRCUIT OPEN(C818) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUNDA/C PRESSURE TRANSDUCER(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (C918) A/C PRESSURE TRANSDUCER GROUND CIRCUITPCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).Diagnostic Test1.A/C PRESSURE TRANSDUCER VOLTAGE BELOW 0.6 OF A VOLTDiagnose any CAN - C Communication DTCs before continuing.Make sure the A/C refrigerant System is properly charged per Service Information.Start the engine.With a scan tool, read the A/C Pressure Sensor voltage.Is the voltage below 0.6 of a volt?YesGo To 2NoRefer to the INTERMITTENT CONDITION Diagnostic Procedure.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)2.(C818) 5-VOLT SUPPLY CIRCUITTurn the ignition off.Disconnect the A/C Pressure Transducer harness connector.Ignition on, engine not running.Measure the voltage on the (C818) 5-volt Supply circuit in the A/C Pressure Transducer harness connector.Is the voltage between 4.5 to 5.2 volts?YesGo To 3NoGo To 63.A/C PRESSURE TRANSDUCER With the scan tool, monitor the A/C Pressure Transducer voltage.Is the voltage above 0.6 of a volt?YesReplace the A/C Pressure Transducer.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 44.(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO GROUNDTurn the ignition off.Disconnect the C1 TIPM harness connector.Measure the resistance between ground and the (C18) A/C Pressure Signal circuit in the A/C Pressure Transducer harness connector.Is the resistance below 100 ohms?YesRepair the short to ground in the (C18) A/C Pressure Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 55.(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (C918) SENSOR GROUND CIRCUITMeasure the resistance between the (C18) A/C Pressure Signal circuit and the (C918) Sensor Ground circuit in the A/C Pressure Transducer harness connector.Is the resistance below 100 ohms?YesRepair the short between the (C918) Sensor Ground circuit and the (C18) A/C Pressure Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 86.(C818) 5-VOLT SUPPLY CIRCUIT OPENTurn the ignition off.Disconnect the C1 TIPM harness connector.Measure the resistance of the (C818) 5-volt Supply circuit from the A/C Pressure Transducer harness connector to the C1 TIPM harness connector.Is the resistance below 5.0 ohms?YesGo To 7NoRepair the open in the (C818) 5-volt Supply circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)7.(C818) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUNDMeasure the resistance between ground and the (C818) 5-volt Supply circuit in the A/C Pressure Transducer harness connector.Is the resistance below 100 ohms?YesRepair the short to ground in the (C818) 5-volt Supply circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 88.TOTALLY INTEGRATED POWER MODULEBefore continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.Were any problems found?YesRepair as necessary.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoReplace the Totally Integrated Power Module per Service Information.Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)