B1546

DTC B1546: A/C Refrigerant Pressure Malfunction

DTC Detecting Condition and Trouble Area






DTC Troubleshooting

1.
Was "Air Conditioning System Check" performed?
YES -
Go to Step 2.
NO -
Go to Air Conditioning System Check Air Conditioning System Check:Auto A/C.

2. DTC check

Connect scan tool to DLC with ignition switch turned OFF.
Turn ignition switch to ON position and check DTC in BCM.

Is DTC B1141 or B1142 (BCM) detected?
YES -
Go to applicable DTC diag. flow.
NO -
Go to Step 3.

3. DTC check

Check DTC in ECM.

Is DTC P0532 or P0533 detected?
YES -
Go to applicable DTC diag. flow.
NO -
Go to Step 4.

4. A/C refrigerant pressure and outside air temperature data check

Start engine and select "Scan Tool Data" mode on scan tool.
Check "Refrigerant Pressure" and "Outside Air Temp" displayed on scan tool.

Are values of A/C refrigerant pressure sensor displayed in "Scan Tool Data" and outside air temperature sensor displayed in "Scan Tool Data" within specified ranges?
YES -
Substitute a known-good HVAC control module and recheck.
NO -
Check the amount of refrigerant and system for leaks.