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Test Description

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 4:  Tests for the proper operation of the circuit in the low voltage range.
  2. 5:  Tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to ground.
  3. 6:  Tests for a short to voltage in the 5-volt reference circuit.
  4. 7:  Tests for a high resistance or an open in the low reference circuit.
DTC P0532 or P0533

Step Action Values Yes No
Schematic Reference: HVAC Schematics 
Connector End View Reference: HVAC Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
IMPORTANT: The ambient air temperature must be above 3°C (38°F).
  1. Turn OFF the ignition.
  2. Inspect the A/C compressor for free rotation operation.
  3. Start the engine.
  4. Place the HVAC control module in the OFF position.
Does the A/C compressor operate?		 - Go to HVAC Compressor Clutch Does Not Disengage  Go to Step 3 
3
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the A/C High Side Pressure parameter in the powertrain control module (PCM) Engine Data 2 list.
Does the scan tool indicate that the A/C High Side Pressure parameter is within the specified range?		 0.1-4.9 V Go to Diagnostic Aids Go to Step 4 
4 
  1. Turn OFF the ignition.
  2. Disconnect the A/C refrigerant pressure sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the A/C High Side Pressure parameter in the engine control module (ECM) Engine Data 2 list.
Does the scan tool indicate that the A/C High Side Pressure parameter is less than the specified value?		 0.1 V Go to Step 5  Go to Step 11 
5 
  1. Turn OFF the ignition.
  2. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the A/C refrigerant pressure sensor and the signal circuit of the A/C refrigerant pressure sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the A/C High Side Pressure parameter in the PCM Engine Data 2 list.
Does the scan tool indicate that the A/C High Side Pressure parameter is greater than the specified value?		 4.9 V Go to Step 6  Go to Step 9 
6 
  1. Disconnect the fused jumper wire.
  2. Measure the voltage between the 5-volt reference circuit of the A/C refrigerant pressure sensor and the low reference circuit of the A/C refrigerant pressure sensor.
Does the voltage measure less than the specified value?		 4.9 V Go to Step 7  Go to Step 8 
7 
  1. Turn OFF the ignition.
  2. Disconnect the negative battery cable.
  3. Measure the resistance from the low reference circuit of the A/C refrigerant pressure sensor to a good ground.
Does the resistance measure less than the specified value?		 5 Ω Go to Step 13  Go to Step 12 
8 Test the 5-volt reference circuit of the A/C refrigerant pressure sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 14 
9 Test the 5-volt reference circuit of the A/C refrigerant pressure sensor for the following:
  • A short to ground
  • A high resistance
  • An open

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 10 
10 Test the signal circuit of the A/C refrigerant pressure sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 14 
11 Test the signal circuit of the A/C refrigerant pressure sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 14 
12
  1. Disconnect the HVAC control module.
  2. Test the low reference circuit of the A/C refrigerant pressure sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 14 
13 Inspect for poor connections at the harness connector of the A/C refrigerant pressure sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 15 
14 Inspect for poor connections at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 16 
15 Replace the A/C refrigerant pressure sensor. Refer to Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement .
Did you complete the replacement?		 - Go to Step 17  -
16 Replace the ECM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 17  -
17
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 - Go to Step 2  System OK
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