P0532
DTC P0532 A/C REFRIGERANT PRESSURE SENSOR "A" CIRCUIT LOW INPUTGENERAL DESCRIPTION
An A/C refrigerant pressure sensor is installed near the expansion valve. This sensor is used by the ECM/PCM to evaluate A/C system pressure for the purposes of idle speed correction, cooling/condenser fan control, and A/C compressor control.
DTC DESCRIPTION
If signal is below 0.195 V under detecting condition, ECM/PCM sets P0532.
DTC Detecting Condition:
Specification:
Schematic Diagram (A/T):
Schematic Diagram (M/T):
MONITOR SCANTOOL DATA
1. Connect scantool to Data Link Connector (DLC).
2. IG "ON".
3. Select "Diagnostic Trouble Codes (DTCs)" mode, and then Press F4 (DTAL) to check DTC's information from the DTCs menu.
4. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions noted in the DTC detecting condition.
5. Read "DTC Status" parameter.
6. Is parameter displayed "History (Not Present) fault"??
NOTE:
- History fault : DTC occurred but has been cleared.
- Present fault : DTC is occurring at present time.
YES - Fault is intermittent caused by poor contact in the sensor's and/or ECM/PCM's connector or was repaired and ECM/PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO - Go to "Terminal & Connector Inspection" procedure
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminal condition. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES - Repair as necessary and go to "Verification of vehicle Repair" procedure.
NO - Go to " Power Circuit Inspection " procedure.
POWER CIRCUIT INSPECTION
1. Key "OFF".
2. Disconnect the NC pressure sensor connector.
3. Key "ON".
4. Measure the voltage between terminal 3 of NC pressure sensor harness connector and chassis ground.
Specification : 5 V
5. Is the measured voltage within specification?
YES - Go to "Signal circuit inspection" procedure.
NO - Repair Open or Short to ground in NC pressure sensor power circuit and go to "Verification of Vehicle Repair" procedure.
SIGNAL CIRCUIT INSPECTION
1. Check short to ground
1. Key "OFF".
2. Disconnect A/C pressure sensor and ECM/PCM connector.
3. Measure the resistance between terminal 2 of A/C pressure sensor harness connector and chassis ground.
Specification : Infinite
4. Is the measured resistance within specification?
YES - Go to "Check open in harness" procedure.
NO - Repair Short to ground in A/C pressure sensor signal circuit and go to "Verification procedure.
2. Check open in harness
1. Key "OFF".
2. Disconnect A/C pressure sensor and ECM/PCM connector.
3. Measure the resistance between terminal 2 of A/C pressure sensor harness connector and terminal 79/C01-1 of ECM/PCM harness connector. [A/T]
Measure the resistance between terminal 2 of A/C pressure sensor harness connector and terminal 40/C01 of ECM/PCM harness connector. [M/T]
Specification : Approx. below 1 ohm
4. Is the measured resistance within specification?
YES - Go to "Component inspection" procedure.
NO - Repair Open in signal circuit and go to "Verification of Vehicle Repair" procedure.
COMPONENT INSPECTION
1. A/C pressure sensor inspection
1. Key "OFF" and connect the scantool.
2. Connect the probe to A/C pressure sensor signal and select the oscilloscope in the menu.
Specification:
3. Check the change of waveform with A/C "ON" and A/C "OFF" after engine start.
4. Is the measured waveform of A/C pressure sensor normal?
YES - Substitute with a known - good ECM/PCM and check for proper operation. If the problem is corrected, replace ECM/PCM and go to "Verification of Vehicle Repair" procedure.
NO - Substitute with a known - good A/C pressure sensor and check for proper operation. If the problem is corrected, replace A/C pressure sensor and go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
3. Are any DTCs present?
YES - Go to the applicable troubleshooting procedure.
NO - System is performing to specification at this time.